Jun 03

(No title)

With the development of the country, many affluent families have enough financial ability to construct a swimming pool for themselves to pursue their hobby in the summer. With the swimming pool, it is very important to keep the water clean and fresh. To do this task, people will need the help of the pool pump which plays an integral part. This equipment can help you to filter the water to prevent the adverse effects on human’s skin. Although the pool pump is very vital in maintaining the pool, people don’t know much about this equipment. Before searching for so and so many pool pump reviews to pick up the suitable, let’s have a glance at this article to understand more about the pool pump.


1. The function of the pool pump

People have a tendency to take the advantage of the pool pump for several reasons. The pool pump is the most important part of the swimming pool that cannot be replaced by other equipment. People usually take the use of the pool pump to throw the water away the pool and then, circulate the water throughout the filter layer to stop the algae, bacteria and the particles.

After removing the negative factors, the pump will circulate the water that is clean to return to the pool. The pool pump can make a great contribution to the distribution of the chemicals which can help to keep the water in the pool clear and clean. The pool pump can put an end to the debris that can negatively affect people’s health when they are swimming. Furthermore, the pool pump will carry the debris out of the pool to flow to the drain.

2. The longevity of the pool pump

When you make a decision of purchasing the pool pump, you may pay more attention to the lifespan of the pool pump. You wonder about the time of the pool pump as well as its quality.

In fact, there are many ways that can enhance the lifespan of the pool pump. You can apply some ways to increase the longevity of your pool pump instead of buying the new one. To raise its lifespan, you can reduce the using time as much as possible. Many people don’t know how to reduce and they don’t believe in reducing the amount of time that we run the pool pump.

It is frank to say that their worry is unnecessary because apart from reducing the time using, we need to take some steps to combat the unexpected situations. The pool pump is the same as other equipment that need to be cleaned and maintained more frequently.

You can take the advantage of a number of the tool to clean the pool pump, including the brushes, the skimmers and the vacuums. As we knew, the pool pump is responsible for removing the debris, so we need to clean it after filtering. In addition, you also can divide the using time into some short times to make for sure that the pool pump can work very effectively.

3. The energy

The amount of the energy that the pump uses will depend on the size of the pump. The larger pool pump is, the more energy it costs. In fact, if you don’t need to use the pool pump too much, you can make a choice of the smaller one because sometimes the size of the pool pump is not very important. You can opt for the smallest pool pump.

Additionally, you cannot let your pool pump work on 24 hours more regularly. If your pump operates for a very long time, there exists more tear and wear on the pool pump that leads to the short lifespan. According to the research of the scientists, every pool just needs less than 11 horsepower.

4. The pump timing

The speed of the pool pump will base on the necessary for circulating the water via the filter system. The rate of the turnover is various that depends on the size of both the pool and the pump. The pump has the ability to circulate the water in 6 or 8 hour period.

In conclusion, the pool pump is one of the most necessary things in every swimming pool. Wish that this information can help you gain more knowledge as well as information about the new equipment to serve your personal purpose. Hopefully, in the future, you can select the best pool pump.

Mar 09

Birthday Present for Elder People

50TH birthday is one of the most important milestones and is the chance for a person to have a look at their previous timeline. Choosing a proper present for a friend, a family member or a colleague in this occasion is very difficult. For each relationship, we have another kind of present that we need to choose, maybe go somewhere with friends, or go online, look for some record player reviews and purchase one, or just a huge birthday cake to celebrate. So let’s see if you can get any useful information from this post or not. I’m sure this will not waste your time if you need to choose a gift for somebody at the age of 50.

  1. For a family member

family member

In 50th birthday of a family member, you can think of a handmade gift to celebrate the whole half century. You can ask the whole family to gather photos, pictures, news, old tickets and postcards. Use these unforgettable memories to make some simple and lovely souvenir. It surely will recall many forgotten memories and bring joy to your birthday party. You can host a party with his or her favorite themes.

  1. For your friends

With a friend that is going to be 50, bypass the souvenirs because they will be covered with dust in this age. Instead, having a dinner together, watching a play or taking part in some activities that your friend loves. Never buy him/her the only ticket because he/she would never want to go to public places alone. Considering going with him/her or if he has his wife/husband, think of the other ticket. As usual, people don’t want to spend too much money on those luxury activities; however, to bring the chance to enjoy life in this age, spending a little bit more money is essential.

  1. For your colleague

When purchasing something for your co – worker that turns to 50 this year, make sure that you don’t insult him or her or spending too much on the gifts. The best birthday present for a 50 – year – old colleague can be flowers, candies or some cheap jewelry such as necklace, brace lace or a unique cufflinks. Besides, you can find out what are their hobbies and take advantage of those. For example, if your colleague likes knitting, buy a book about it or pay 3 month fees for their favorite magazine with a postcard with your best wishes and health.

  1. Some suggestions for your gift choice
    • A warm coat or a pair of warm woolen shocks.
    • A set of clothes with a pair of jogging shoes.
    • If the person has a pet like a dog or a cat, purchase a box of pet food or some toys for their pet.
    • Pay their monthly bills, 1 or 2 month for the electricity bill, telephone, gas, water for the receiver and let him or her know that there would be some more for him or her to spend for his or her favorite.
    • A mobile phone or a text messenger as a gift could be a nice choice because it’s a reality gift.
    • Some calling cards for the elder.
    • Not every elder person can drive so if it’s possible; give them a bus monthly ticket or pre-paid taxi ticket.
    • A big calendar with family’s birthdays and anniversaries.
    • Some albums with family photos.
    • Notes and phonebooks with large font
    • A magnifier to read books or maps
    • Because medicines are very essentials for elder people but the price is not cheap at all, you can give them some medicine discount tickets from drugstores near their house (trust me, they would be deeply appreciate you for this)
    • Buy some food or recipe books if you want to give present for a cook lover.

Loneliness is one of the heaviest burdens that elders have to withstand when they begin to retire from work. Maybe the best gift to them is somebody remembering them every day and visits them regularly. That would be the best gift to elder not just a single gift when they are 50. If you need something more special, visit our store and maybe we can find something that can make the 50th birthday unforgettable!

Jan 12


When it comes for impact driver, it is known to be a good piece of tool. It is good and gives torque easily that is usually of the standard hand driver or you can say wrench and it also include with it force that is of high rotating speed. The types can be electric, hydraulic one, pneumatic and they may be different in their own way and may have several disadvantages. You may also find some of the cordless types that are helpful and they may often be expensive than the others.

You may find best impact driver 2016 that may easily help you to get the right benefit from. Suppose you are using impact driver so the very first thing you must keep in mind is to use it with proper safety. You may learn several tips and easy ways that will help you to use impact driver with keeping safety tips in mind. You may follow them properly and get the most of it. Here are the important safety tips discussed below:


This is related with any type of power tool that you may use. This must be made before so that you may not face any problems when you are using it. You must keep your hair properly covered and also before using keep clutter out in that area and keep the floor dry as well. You must also have jacket along with you and with it keep safety goggles on your eye that may protect you. This impact driver needs more force so if breaking occurs that may create problem for you.


You may attach with different tools or part whenever you wish to have any opening like the socket one. You must check appropriate fitting for every drill part along with the different attachments and that must be correct. If this is not the case so it may cause harm. Tools must be properly covered and used with different direction may cause certain problems for you and it will be difficult to use as well. you must check things compatible to each other as before using them and checking that they are right for working or not.


People often use things in different way that you must be keeping an eye on and check for the right way that must be done and used. Just imagine if any tool is not use for the right purpose, like for instance using microwave oven for letting the clothes get dried up. Will that the right way to use microwave over? Same goes for impact driver if it is not used for the designed function that it may cause damage and may even harm you that will be damaging your entire tool and yourself as well.  You may get even destruction at the place where the functioning is taking place.


You must know proper area where you are working that will help you to look after proper hazards and difficulties and you must know all the problems you may face in the future so you must be use to with the area you are working in and checking the required requirements of that particular area. You must make proper list and think of all the possible things in that work area that you wish to check and also never ignore such things that may harm you in the future.


This is another way for the safety that must be checked and keep an eye for and that must be helpful when getting benefit from the impact driver. You must find it getting to the ripping itself properly into several parts and keep the driver easily maintained as well. the machine that you use need proper maintaining and checking throughout in several months and you must clean it so that it work proepryl and in same way as well. this will help you to use it however you like to use it.


This may easily help you to keep things appropriately and may help you causing less damage and may help cost catastrophes. This may lead to storing in different way and with this hurt may cause to your children and any pet animals if they are kept at home. So try keeping it in good place.

Apr 19

The using Advantages of DeWalt DCF885C2 Impact Driver

The very first thing you will observe may be the look. It’s yellow, obviously, that, for a lot of DIY as well

as building experts, is sufficient (simply for their devotion towards the company). However as well as the

color, you will observe this device is actually small, the DeWalt DCF885C2 isn’t the

gadget, in spite of its look.


The using Advantages of it:

The query might have happened for you, why not only purchase a cordless drill? It is accurate, cordless

exercises happen to be the actual device of preference for a long period. Nevertheless, a few handful of

benefits how the most recent technologies offer within the regular cordless drill. The advantages of

DeWalt DCF885C2 Impact Driver are given below:

  • To begin with, you receive a lot more torque. Actually, the 12V impact driver may provide alot more than two times the actual torque of the 18V cordless drill.
  • This occurs due to the method a good impact driver functions. It’s an interior sludge hammerproviding you with bursts associated with energy rather than continuous software associated withenergy.
  • There isn’t any kick-back when utilizing a good impact driver. The cordless drill may hole aswell as relax, leading to unnecessary tension about the owner’s arm as well as equip. This particularmerely doesn’t occur by having an impact driver.
  • How big these types of brand new resources enable the use of places exactly where verylittle cordless drill may proceed — very little areas.
  • This particular is a superb query. Effect motorists aren’t for everybody. Nevertheless, ifyou’re the do-it-yourself type of man or even woman, this can be a device you want inside yourtoolbox.
  • Impact drivers are in their finest whenever utilized because buckling resources. They’llgenerate your own hardest nails, such as lengthy lag mounting bolts as well as outdoor patio anchoringscrews.
  • They are able to additionally manage the little, sensitive nails such as cupboard anchoringscrews. Tales likewise incorporate make use of along with auto as well as yard gear, getting rid ofpersistent, rusted carry nut products or even mounting bolts.
  • It’s a useful device, without a doubt. The actual lithium-ion battery can also be an advantage.This particular device consists of 2 small batteries.
  • Small doesn’t imply much less energy, however, it will imply the actual battery won’t havethe future period of the full-sized battery. The good thing is it costs in under 30 minutes.
  • The DeWalt DCF885C2 provides a few fairly upstanding Generating 0-2, 450 RPM, 0-3, four
    hundred IPM as well as a powerful 950in-lbs associated with maximum torque, the actualdevice is really a powerhouse using the capability to take care of the actual most difficult impact-drivingprograms you are able to toss from this.
  • Offering a brand new 1/4″ hex throw made to permit customers in order to fill as well aslocking mechanism pieces along with one hand, the actual driver is actually unabashedly handy as wellas easy to run.
  • The lighting will also be situated in front of the device permitting the actual driver to supplythe practical shadowless operating atmosphere in spite of any kind of mixture of operatingproblems.


Since the device is actually driven along with DeWalt DCF885C2 lithium ion battery technologies, the

actual device provides prolonged run-time having a powerful, non-dwindling as well as fast-charging

energy supply. Basically, this particular impact driver offers truly obtained a person protected; it is a

thorough, total saw with the piquancy to make sure work tend to be finished quick with the most expert

overall performance.

Jan 10

The future electric tools will probably be smaller and easier to operate

Tomorrow’s Tools

Chris Cable, president of Fein Power Tools Inc. (Pittsburgh), predicts that future electric tools will probably be smaller and easier to operate, but also more powerful and more intelligent.

“Although the shape has changed, the principle has not,” Cable says. “A small electric motor drives the spindle with a drill chuck. The gear unit between the motor and the drill spindle, introduced by Fein in 1903, is simply a variation of the first design. And that won’t change in the future.

“Only the application determines the design,” Cable says. “That’s the way it was in 1895 and that’s how it will be in 10 or even 50 years from today.”

According to Cable, power/ weight ratio and electronics are key aspects of advancing tool technology. “Even smaller, even more powerful is the motto. This doesn’t make for spectacular jumps, but instead ensures continuous further development,” Cable notes. Comparisons between today’s power tools and those built 10 years ago don’t show sensational differences, he says. “Over the past few years, the biggest jump resulted from the introduction of battery-powered tools. With this innovation, power tools added a second, very mobile leg on which they stand firmly today. In the next 20 years, major advances are expected in this area, and they will mainly concern rechargeable batteries.

“The goal is to improve the power/weight ratio to provide increased capacity for the same size and weight, or to achieve the same capacity with a reduced weight and size,” Cable points out.

Today’s batteries are not comparable to the first ones built, Cable contends, “and in 20 years they will have changed even more. Whether nickel-cadmium batteries will be replaced by a completely different system remains to be seen,” he concludes.

Bosch Automation’s Valder concurs, saying, “Cordless assembly tools for difficult-to-reach assembly operations, or operations where power cords or air hoses are in the way, will continue to gain popularity–especially as manufacturers continue to develop batteries that increase torque capabilities and increase tool battery life.”

New Product Notes

Black & Decker is debuting its first cordless impact tools with a line of heavy-duty, torque-adjustable impact drivers and a drill/driver. Applications include driving screws and lag bolts. The 12-volt 2812K and 9.6-volt 2810K impact drivers both feature 0 to 2,000 rpm performance. The 12V unit delivers up to 850 in.-lb of torque; the 9.6V unit delivers up to 625 in.-lb of torque.

Deprag (Lewisville, TX) has introduced the Minimat-F, an “intelligent” screwdriver with a multifunctional control. The device counts screwdriving cycles, supervises assembly times, recognizes parts changes and supervises its operation.

ASG Div., Jergens Inc. has introduced a line of corded AC screwdrivers. Featuring an ergonomic ribbed grip, models include VZ-1820 (2,000 rpm) and VZ-3012 (1,200 rpm). Both offer lever or push to start.

Bosch Automation recently unveiled a line of pulse nutrunners called CLEAN–Consumption-optimized, Lubrication-free, Ergonomic Air tools with Noise reduction. According to the firm, the tools offer low noise (less than 70 dB [A]) and torque accuracies to [+ or -] 8% and consume 30% less air than traditional impact wrenches.

At over 4,000 rpm, Tech Motive’s Type 1 DC electric pulse tool is said to offer accurate torque control within 10% with one-handed operation. An internal transducer, rather than an adjustment inside the pulse mechanism, provides accurate torque control.

At AIMCO, Hall reports comparative testing shows the firm’s new Alpha-T70 pistol-grip pulse tool generates 0.46 N-sec of reaction impulse at 30 ft-lb–a 200-fold reduction in reaction impulse.

Last month, Cooper Power Tools Div. (Lexington, SC) unveiled a line of electronically controlled pulse nutrunners. Highlighted by the m-Pro-90 series controller, a self-diagnosing microprocessor, the line provides full fastening process documentation and features hydraulic components said to eliminate reaction to the operator.

Five automatic shutoff nutrunners, with a torque range of 10 ft-lb to 100 ft-lb, have expanded Ingersoll-Rand Co.’s Tool and Hoist Div.’s Power-Pulse line. Torque ranges overlap and the models weigh from 4 lb to 8.8 lb.

Chicago Pneumatic’s recently unveiled LaserPulse line of nutrunners provides a pulse mechanism that provides maximum energy with each pulse. The mechanism is said to provide faster rundown on prevailing torque fasteners than conventional pulse tools, without sacrificing torque accuracy.

Jan 10

Celebrating a century of service – Part 2

Trendy Tools: Electric, Cordless

Electric tools are increasingly popular, according to industry sources. Tom Beckwith, regional manager at the Advanced Systems Group (ASG, Cleveland), div. of Jergens Inc., cites the ease of getting the tool into the operator’s hand, and into production, as a main factor. “With an electric tool, you just plug it in and you’re ready to produce. There’s no dealing with air lines, compressors, plumbing, filter regulator and lubrication,” Beckwith notes.

He adds that electrics get “high marks on the ergonomic side because of their light weight, good feel with minimal torque reaction and low operating noise. Torque repeatability is another plus. Used with a torque calibrator, the operator can dial to the next torque setting, lock the torque nut and begin assembling parts with consistent precise torque accuracy,” Beckwith says.

Cordless tools are growing in popularity. At Black & Decker (Towson, MD), cordless tools–drills/drivers, screwdrivers, impact wrenches/drivers–are a fast-growing product line for the firm. Says Allan Brelsford, product manager, “Cordless tools offer workers portability, maneuverability in tight spaces and flexibility. Battery-powered tools allow workers to move about the work site without being connected to a power source by an air hose or electrical cord, increasing productivity.

“The convenience advantages, coupled with several advances in cordless technology, drive wider use of cordless power tools in a variety of applications,” he says.

Battery-charging technology represents a key advance, Brelsford believes. “Early cordless batteries and charging systems required up to 12 hr to recharge one battery,” he recalls. “With today’s fast chargers, depleted batteries can be charged to full capacity in as little as 15 min. New charging methods also rely on sophisticated electronic controls so batteries are not damaged during charging and battery life is extended.”

He adds that energy capacity has increased significantly, even doubled, in the past 10 years. “This has dramatically increased the number of fasteners seated per charge in manufacturing applications, making cordless tools more popular in these settings,” Brelsford claims.

And ergonomics is driving cordless tool growth in manufacturing, he believes. “Power tool manufacturers have learned a great deal about improving human factors design by watching and talking to workers who use tools for up to 10 hr a day. We are incorporating this feedback into development of new tools,” Brelsford says.

For example, rubber grips added to the handles of many power tools provide a more comfortable, better gripping surface. Today’s cordless tools are quieter than earlier models, decreasing noise pollution in the workplace, Brelsford points out.

He adds that manufacturers recognize the need for torque accuracy in manufacturing applications. “There is a direct link between accurate torque in seating fasteners and the quality of the product–whether it is a car or a building. We are continually striving to enhance fastening accuracy,” Brelsford says.

Ergonomics and versatility are hot topics in the tool world, says Mark Hasz, industry manager-assembly tools, Ingersoll-Rand Co. (Athens, PA). “Users consistently seek equipment that is conscious of the operator,” he says. “Tool ergonomics is the key to operator productivity.”

Tool versatility or multitasking, Hasz adds, allOws assemblers to use a tool that accomplishes several goals. “Tools that can handle several applications provide versatility to operators, reduce number of tools on the line and reduce overall cost.”

According to Hasz, users increasingly request tools that reduce the mean shift between a “soft” and “hard” joint usage. “Operators want to use a unit that can produce consistent results regardless of the joint type,” he explains.

Another trend is requests for technology that tracks tool accuracy and offers feedback to the operator, Hasz adds. “This mirrors the trend of companies that want to maintain high quality control standards and keep more detailed, permanent assembly records.”

According to Jan “J.J.” Aijkens, general manager at Deprag Inc. (Lewisville, TX), many manufacturers increasingly stress improving quality. “When the focus is on screwdriving,” Aijkens says, “torque accuracy and repeatability are more important than ever. To achieve ISO 9000 registration, manufacturers must to look at quality on a companywide scale. A tool either meets or fails the quality specifications–it’s as simple as that.”

Torque measurement is key, Aijkens indicates. “There are many methods and devices available. Whatever is used, the accuracy of the device measuring the torque must be many times greater than the torque accuracy of the tool being tested. The general trend we see is a growing awareness of this.

“The engineers and supervisors don’t care how things were done in the past. They want to know how to do it the right way,” Aijkens explains. “Over the years, we have seen a wide variety of torque measuring devices and methods–some of which can be best described as doubtful. We are happy to see this quality awareness trend spreading out so rapidly, since we can offer a solution in many cases.


“It’s similar to what ergonomics did to the industry a few years ago. Forced by operator injuries and insurance companies, ergonomics became a major issue. The words carpal tunnel syndrome entered everyday language quickly; the same is happening with 3 Sigma, CPK and ISO 9000,” Aijkens observes.

Kirk Hall, director of training at Portland, OR-based AIMCO, concurs on the ergonomics issue. “The ergonomics of pneumatic and electric power tools drives design requirements placed on power tool producers. Not only does an ergonomic tool reduce costs associated

with cumulative trauma disorders, but it has a substantial impact on other driving forces of the fastening process–productivity, tool reliability and product quality,” Hall notes.

He points out that most torque-control fastening tools are continuous drive, stall or mechanical clutch screwdrivers and nutrunners in in-line, pistol-grip or angle-type designs. “Unfortunately,” he observes, “continuous-drive tools create a high amount of reaction impulse (reaction over time). For example, a right-angle (mechanical clutch) nutrunner that applies 30 ft-lb of torque on a prevailing torque fastener generates a reaction pulse of over 111 Newton-sec (N-sec). The reaction pulse after each fastening cycle creates several problems.

“First,” Hall explains, “the operator has to use two hands to counter the impulse. This makes one hand nonproductive. Second, the operator will do whatever it takes to make the tool work–even if it does not allow the tool to do what it was designed for. This concentration on the tool’s effect, and not the fastening process, puts the desire to increase productivity, tool reliability and the product’s assembled quality on the back burner,” Hall says.

Lynn Oldroyd, senior product manager at Chicago Pneumatic Tool Co. (Utica, NY), recalls that pulse tools date to the 1960s. “They never proved practically functional until technological advances in the ’80s increased fastening speed and shutoff accuracy. Since then, major assembly plants have gradually accepted pulse tools as a value-added alternative to conventional fastening tools.”

As with conventional tools, pulse models have problems: slow rundown, significant mean shift between hard and soft joints, frequent inability to sustain peak performance throughout the fastening cycle and high operating temperatures that rapidly deteriorate oil and seals, Oldroyd notes.

Jan 10

Celebrating a century of service – Part 1

It was 1895. At a small factory in Stuttgart, Germany, Wilhelm E. Fein, founder of C. & E. Fein Co., was inventing portable telephone equipment, electric lighting systems and other innovative uses for electrotechnology. One day Fein noticed that two mechanics had fitted a small motor to a drill chuck. Realizing the makeshift device’s potential, he went to work with designer Otto von Kellenbach. The world’s first portable power tool–a hand-held electric drill–was born. According to company records, the drill weighed 16.5 lb and drilled a 5/32-in. hole in steel.

A century later, power tools have come a long way. Fein, with a U.S. subsidiary in Pittsburgh, supplies over 200 tools to workers speaking more than 25 languages.

A multibillion-dollar industry, these ubiquitous tools are indispensable in the transportation, aerospace, electronics and home appliance industries, as well as most other manufacturing operations large and small.

For example, Ernst Van Bergeijk, supervisor, power and torque automotive assembly, at Ford Motor Co., reported results of a 1993 tool survey. They include:

  • 55% of the firm’s labor force uses a handheld power tool
  • average tool inventory in an assembly plant is 4,500 tools worth $5 millio
  • 75% ,of power tools are nutrunners and screwdrivers
  • during assembly of an average vehicle, about 1,500 fasteners are installed with the torque ranging from 0.7 Nm to 500 Nm.

Change Challenges Suppliers

Dan Grippo, product manager for Atlas Copco Tools Inc. (Farmington Hills, MI), was surprised at how change has accelerated in recent years. He says his firm anticipated that the tool industry would undergo “tremendous” change during the ’90s. “However, we underestimated the speed at which these changes would occur!

“Partnering, single-source suppliers, alliances, common platforms–these are becoming a reality sooner than anyone could have imagined,” Grippo says.

He asserts the changes have brought on an “exploding transition” from air tools to electric tools. A current trend, he says, is toward certifiable battery-powered tools. “Large user groups are combining their efforts to determine the proper selection criteria pertaining to ergonomics and quality issues,” Grippo reports.

“As manufacturers, we are responsible for providing certified products that integrate a high standard of quality and ergonomic features. The days when great sales pitches sold the product are past. Assemblers demand tools that will fulfill expectations,” Grippo declares.

Manufacturers’ need for increased process control requires assembly tools with enhanced accuracy in torquing repeatability, notes Jeff Valder, product manager at Bosch Automation Products (Buchanan, MI).

He cites three developments in power tool technology expected to improve assembly process control. They are:

  • integrated electronics in pneumatic tools to more accurately measure fastener torque
  • speed controls and multiple torque settings to perform accurate torquing for products built in batch runs
  • computer-controlled tools that digitally download torquing results for statistical process control. Valder remarks that these computer-controlled tools also enable programming for fastening challenges such as joining through aluminum or plastic intervening parts.

Pulse tools with automatic shutoff clutches will continue to overtake traditional pneumatic tools, Valder predicts. The reason: “Their (pulse tool) torque is more accurate and repeatable than impact wrenches, and rundown time on the fastener is faster, increasing product throughput,” Valder says.

A “constantly shifting” emphasis away from pneumatic-driven tools to DC electric models with electronic controllers for noncritical applications is a trend cited by Mark W. Lehnert, vice president and general manager, Tech Motive Tool Div., GSE (Southfield, MI).

“Quality issues and the need for SPC data are responsible for this shift, as well as elimination of after-the-fact torque checking with a hand torque wrench,” Lehnert says.

He adds that ergonomic concerns drive changes in design, reaction time management and motor combinations to produce speeds faster than those found in traditional air tools. “Many operators favor pistol-grip tools due to their speed and one-hand operating ease. Introducing electronic controls to the pulse tool satisfies both the operator’s needs and demands for accuracy and data collection,” he observes.

According to Lehnert, major suppliers of DC electric-powered nutrunners have boosted sales more than 25% annually during the past five years.

Jan 10

The best of cordless drills are available in the market.

Bosch Brute Tough 33614

Battery: NiCad; 14.4 volts, 2.0 amp-hours, 28.8 watt-hours

Maximum torque: 475 inch-pounds

Weight: 5.3 pounds

Power-to-weight ratio: 90 inch-pounds/lb.

Speed range: 0-450, 0-1,400

Street price: $189

Comments: Excellent power and power-to-weight ratio; all metal gears; steel reinforcing collar at front of gun.

Bosch Compact Tough 32614

Battery: NiCad; 14.4 volts, 2.0 amp-hours, 28.8 watt-hours

Maximum torque: 300 inch-pounds

Weight: 4.2 pounds

Power-to-weight ratio: 71 inch-pounds/lb.

Speed range: 0-400, 0-1,200

Street price: $159

Comments: Very light and compact; good power for size; a top choice for finish work.

DeWalt DW983

Battery: NiCad; 14.4 volts, 1.7 amp-hours, 24.5 watt-hours

Maximum torque: 400 inch-pounds

Weight: 5.3 pounds

Power-to-weight ratio: 75 inch-pounds/lb.

Speed range: 0-450, 0-1,400, 0-1,800

Street price: $199

Comments: A solid performer; only drill with three speed ranges; all-metal gears and gear case; battery has the lowest amp-hour rating of the tools tested.

Hilti SF150-A

Battery: NiMH; 15.6 volts, 3.0 amp-hours, 46.8 watt-hours

Maximum torque: 300 inch-pounds

Weight: 4.9 pounds

Power-to-weight ratio: 61 inch-pounds/lb.

Speed range: 0-450, 0-1,450

Street price: $349

Comments: A sleek tool with superior batteries and run-time; comes with multiposition auxiliary handle.

Hitachi DS14DVB

Battery: NiCad; 14.4 volts, 2.0 amp-hours, 28.8 watt-hours

Maximum torque: 280 inch-pounds

Weight: 4.6 pounds

Power-to-weight ratio: 61 inch-pounds/lb.

Speed range: 0-350, 0-1,200

Street price: $149

Comments: Lightweight and low cost but doesn’t stand out in performance.

Makita 6337DWDE Mforce

Battery: NiMH; 14.4 volts, 2.6 amp-hours, 37.4 watt-hours

Maximum torque: 350 inch-pounds

Weight: 4.8 pounds

Power-to-weight ratio: 73 inch-pounds/lb.

Speed range: 0-400, 0-1,300

Street price: $199

Comments: Midsize drill with better than average run-time; all-metal gears; drill mode activated by shift lever; unique two-piece motor; a good all-around performer.

Metabo BST 15.6 Plus

Battery: NiCad; 15.6 volts, 2.4 amp-hours, 37.4 watt-hours

Maximum torque: 484 inch-pounds

Weight: 5.1 pounds

Power-to-weight ratio: 95 inch-pounds/lb.

Speed range: 0-450, 0-1,600

Street price: $299

Comments: Highest power and power-to-weight ratio; unique pulse drilling mode makes it easier to drive and remove fasteners.

Milwaukee Lok-Tor 0616-24

Battery: NiCad; 14.4-volts, 2.4 amp-hours, 34.6 watt-hours

Maximum torque: 460 inch-pounds

Weight: 5.8 pounds

Power-to-weight ratio: 79 inch-pounds/lb.

Speed Range: 0-500, 0-1,700

Street Price: $199

Comments: Heavy and powerful; all-metal gears and chuck; comes with multiposition auxiliary handle; battery can be installed frontwards and backwards, allowing better clearance for some operations.

Panasonic EY6432GQKW

Battery: NiMH; 15.6 volts, 3.5 amp-hours, 54.6 watt-hours

Maximum torque: 390 inch-pounds

Weight: 4.8 pounds

Power-to-weight ratio: 81 inch-pounds/lb.

Speed range: 0-450, 0-1,450

Street price: $209

Comments: Most advanced batteries and best run-time; extremely compact; good power for weight.

Porter-Cable Grip-to-Fit 9978

Battery: NiCad; 14.4 volts, 2.0 amp-hours, 28.8 watt-hours

Maximum torque: 420 inch-pounds

Weight: 5.6 pounds

Power-to-weight ratio: 75 inch-pounds/lb.

Speed range: 0-450, 0-1,400

Street Price: $189

Comments: A big heavy drill; all-metal chuck and gear case; unique adjustable grip.

Battery Basics

With cordless tools, power comes at the expense of run-time. Increase power beyond a certain point, and the tool drains batteries so quickly that it’s no longer practical to use. Luckily, batteries keep getting better and better.

Most of us think of batteries in terms of voltage. But all voltage tells you is how many cells are in the battery. A 14.4-volt battery contains 12 cells, and a 15.6-volt unit contains 13. The amount of energy that individual cells can hold is determined by their amp-hour rating. Ten years back, state-of-the-art was 1.0 amp-hour cells. Right now, state-of- the-art is 3.5 amp-hours, and I’d be surprised if it doesn’t go higher soon.

Watt-hours and storage capacity. The amount of energy contained in a battery is measured in watt-hours. You can calculate the watt-hour rating of a battery by multiplying its voltage by the amp-hour rating of its cells. For example, a 14.4-volt tool with 2.0 amp-hour cells is rated at 28.8 watt-hours (14.4 volts x 2.0 amp-hours). A battery with a 50-watt-hour rating contains twice as much energy as one with a 25-watt-hour rating.

NiCad vs. NiMH. Most cordless-tool batteries contain nickel-cadmium (NiCad) cells, but a small percentage use nickel-metal-hydride (NiMH) cells. NiCads have been around forever, but NiMH batteries have been in cordless tools for less than five years. NiMH cells have higher amp-hour ratings than NiCads.

But the jury’s out on whether one type is better than the other. NiMH cells do hold more energy, but they’re a lot more expensive and can be charged fewer times than NiCads. Just how many charging cycles a battery can undergo is open to debate. Depending on whom you talk to, NiCads can be charged 750 to 2,000 times before wearing out. Someone I know at one of the manufacturers said NiCads are good for about 1,200 cycles. His company doesn’t use NiMH cells because it believes they’re only good for 300 to 500 cycles. But according to Panasonic, which is the only company that makes battery cells as well as tools, NiMH cells are good for 1,200 cycles. And the companies that use NiMH batteries claim you get more run-time over the life of the batteries because they can go a lot longer between charges.

Jan 10

14.4-volt cordless drill-drivers all of parts – Testing Part 2

Size and Configuration

We all have to work in cramped quarters occasionally. But if you do finish work like building or installing cabinets, you get into tight spots all the time. Two tools that stand out for that kind of work are the Panasonic and the Bosch Compact Tough. Both are a lot more compact than the other drills. Excluding the jaws, they measure about 8 1/4 inches front to back. By way of comparison, the longest drills, the Milwaukee, Porter-Cable, and DeWalt, are just over 10 inches long. This may not sound like much, but if you regularly work in tight quarters, an extra inch or two can mean the difference between doing the job with a drill and doing it by hand.

Special Features

All the drills I tested come with two batteries, a case, and a charger. But some have features that I hadn’t seen before.

With most drills, you turn the clutch collar to go from drill to drive mode. But with Makita’s tool, you go from drive to drive by moving a lever on top of the gear housing (Figure 4). That allows you to switch back and forth between drilling and driving without losing your clutch setting. Inside most cordless tools is a metal housing, a can that contains the entire motor. But if you open the Makita, you’ll see a two-piece motor that resembles what you’d find inside a corded tool. According to the manufacturer, this allowed the designers to make the motor smaller, more efficient, faster to cool, and easier to service (Figure 5).

The Metabo drill has a unique hidden feature. Flip a tiny switch on the back of the motor housing, and the tool goes into pulse mode, which causes the motor to pulse on and off when you squeeze the trigger. According to the manufacturer, that makes it easier to start holes in smooth materials like metal. It’s also supposed to make driving and removing fasteners easier, especially if the head is damaged. I didn’t notice any difference drilling metal, but the pulse action did make it easier to ease out damaged screws. I had never given it any thought, but I’ve been doing this manually for years by squeezing and releasing the trigger.

The Makita, Milwaukee, and Bosch Brute have externally replaceable brushes. This feature is a plus for tools that get extremely heavy use, but I can’t imagine it making much of a difference on a cordless drill. You’ll probably wear out the batteries before you go through a pair of brushes. And at that point, the tool will be so out of date that you’ll want to upgrade.


My personal favorite is the Panasonic because it does everything well. It’s in the middle of the pack in terms of power and weight. But it’s extremely compact and has better run-time than any other drill tested. I also like the Bosch Compact because it’s extremely small and light for a 14.4-volt tool. As for the big drills, I like the Bosch Brute and the Metabo because they have the most power and superior power-to-weight ratios. I also like the Milwaukee because it’s comparable in power to the Bosch and Metabo but is easier to grip if you have smaller hands.

Jan 10

14.4-volt cordless drill-drivers all of parts – Testing Part 1


Most cordless drills have 16 to 21 clutch settings. But the actual number is less important than the amount of torque at the highest and lowest settings. Ideally, the lowest should be low enough for fine work and the highest high enough to drive big fasteners.

Most 14.4-volt drills are overkill for light-duty work. But if the tool can handle such tasks, you can get by with a single drill. I use low clutch settings to install electrical fixtures and to install door and cabinet hardware. The ultimate test is to use the drill to install plastic cover plates. The tool passes if it does the job without cracking plates or stripping screws. Seven out of ten drills passed this test. The Bosch Brute and the Hilti both stripped screws and broke plates. The low setting on the DeWalt was off the scale, high enough to sink drywall screws in oak.

The upper clutch settings are less important than the low ones because most workers drive all but the smallest fasteners in drill mode. That said, it’s a plus if the high settings have enough torque to drive fasteners like the long screws used to install sliders and exterior door hinges. I tested that by sinking 2 1/2-inch #8 drywall screws into a 4×4. All of the tools had high enough settings to do it without clutching out.

Speeds and Gears

My first cordless drill was a state-of-the-art tool with a single speed range that topped out at 600 rpm. Compared with the tools you can get now, that drill was downright pathetic. Most of the tools I tested have two speed ranges and max out at around 1,400 rpm. Unlike early models, these tools have enough speed to drill metal and drive self-drilling screws. Low range usually tops out at 400 rpm and is intended for high-torque applications. The DeWalt model is unusual in that it has a third range that tops out at 1,800 rpm (Figure 2).

Some drills have all-metal gears, but most have a combination of metal and plastic. It’s reasonable to think that tools with all-metal gears should be more durable than tools that use a combination of materials, but that isn’t so. Different gears are subject to varying amounts of stress, so there are places where it’s okay to use plastic. The main reason companies choose plastic is not to save money but to lessen the weight of the tool.


Bosch’s compact drill has a 3/8-inch chuck; all the others have 1/2-inch chucks. Most of the tools have a single-sleeve chuck equipped with a self-locking mechanism. The mechanism automatically locks the motor shaft when you twist the chuck by hand. That makes it easier to change bits because you can do it one handed without changing clutch settings. The Hitachi and the Makita have two-piece chucks that aren’t self-locking.

Most of the chucks are made from a combination of plastic and steel, but the chucks on the Milwaukee and the Porter-Cable are all steel. Those manufacturers used only steel to increase durability, but it’s one reason their drills are the two heaviest I tested.


The first thing you notice when you use a new drill is how it feels in your hand. This includes everything from weight and balance to the shape and texture of the grip. All of the drill-drivers except the Metabo have rubberized grips. The rubber provides a little padding but is really there to reduce user fatigue. It does that by making the tool easier to grip, even when your hands are wet.

All of the tools have a T-handle configuration, so they all feel balanced. The grips vary in shape, but they’re all comfortable. That said, you may want to avoid the Metabo and Bosch Brute if you have small hands because it’s a stretch to reach the reversing switch with your thumb.

The Porter-Cable tool has a unique adjustable grip. It comes with interchangeable inserts that can be installed on the back of the grip. The thicker the insert, the bigger the grip (Figure 3).

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