Wednesday, April 26, 2006

 

Battery-Powered-Tools, How to Get the Most From Them

by Colin Knecht

I remember a few years ago one of the sales people at my local hardware store told me they were expecting the arrival of new battery powered circular saw, I think it was a Makita. On hearing the phrase "battery powered circular saw", I laughed out loud and told him to call me when the battery powered table saws arrive. Within a couple of years I had purchased one of those battery powered circular saws that I so willingly scoffed at just a couple of years earlier. I soon discovered that having portable tools had huge benefits. That's why companies like Porter-Cable, Makita, Delta and others have focused on these areas.

These days battery powered tools are available is drills, drivers, impact drivers, routers, jig saws, portable planers, circular saws, reciprocating saws and chop saws, and even Ryobi has battery powered chain saw that works well for big jobs that other tools can't handle. So to see how to get the most from these tools.

Lets stop for a moment and look at batteries that power these units. Most power packs that drive these tools are a series of small rechargeable batteries all wired together to give the optimum power. These rechargeable batteries are very similar to the flashlight batteries that you buy for your TV clicker and garage door opener and various other home products.

The difference between rechargeable batteries like Duracel and Eveready, are that the rechargeables have higher quality shells and consist of slightly different components to make them safe to recharge. The rechargeable batteries that are wired together are normally nickle cadmium (nicad) 1.2 volt batteries. When they are wired together in series ... 8 together equals 9.6 volt, 10 together equals 12.2 volt, 12 together equals 14.4 and so on. That is how more power is generated, more little batteries, more power, and of course, more weight.

The more batteries that are wired together, the greater the torque (or twisting power) of the tool. Torque is created by a combination of horse power and speed, and high speed does not necessarily mean high power. Conversely high power does not necessarily come with high speed..

You will find another type of battery on the market called a "nickle-metal-hydride" (Ni-MH). These batteries use compounds that give the batteries a slightly longer life (they also cost a bit more to purchase). Some contractors prefer tools that will give them longer battery life which is the reason for this more advanced rechargeable battery version.

As woodworkers, we all know one thing, HEAT is our greatest enemy. When saw blades get too hot they lose their tensility and become dull, screws that are driven into hardwoods can snap because of the high heat created by friction, and heat can burn out the electric motors of our machinery if we are not careful. Heat is also the enemy of batteries. All batteries heat up when they are being recharged. The larger battery packs such as 18 volts and larger tend to heat up even more because there are so many batteries in the packs and they don't have heat dispersion characteristics as smaller packs because there are so many batteries next to one another. Batteries tend not to take a charge when they are hot, so keeping the ambient temperature normal to cool is a benefit.

On the flip side, batteries do not do well in cold either. Once the temperature drops below 14 degrees Fahrenheit ( minus 10 Celsius) batteries do not perform well (if at all). Most batteries will lose their power when the temperature gets this low.

The recharging of batteries is a bit of a mystery to a many people. The tendency is to keep batteries fully charged all the time. In truth, batteries need to be exercised in order to keep them in top shape. This means they should be fully discharged every few months, then fully re-charged. "Topping" up battery charges will make the batteries lose their effectiveness, and after a time they will only take a partial charge because that is what they have become accustomed to. This means they will lose their ability to use the full charge. If your older cordless device is doing this, sometimes you can rejuvenate the battery by charging and FULLY discharging it several time.

My old 9.6 Craftsman portable drill, which is now 10 years old has been one of the best tools I have ever owned. I have no idea how many screws it has driven, holes it has bored or blades it has ground, but it's batteries have almost given up now. I checked on the price of new batteries and it will be more cost effective for me to upgrade to a whole new unit ... but I have no intention of getting a big hulking unit, with tons of power, I don't need it and I refuse to pack around all that battery weight, so I am currently investigating some 12 volt units and looking forward to another 10 years of service from my new drill, and when I need more power, I always have my trusty plug-in drill, and the hassle of extension cords that goes with it.

About the Author

Copyright Colin Knecht of WoodWorkWeb.com. This article may be freely distributed and reprinted as long as you leave the article fully intact, including the links.
Visit Woodworkweb.com - woodworking resource for more great woodworking information.

http://www.bestguidetotools.com/tools/

Thursday, April 20, 2006

 

Power Tools

'Assistive technologies' help students with special needs keep pace in the regular classroom.

Not so long ago, Justin Litke never would have had a chance to join 24 other eager and energized kids in Jane Throndson's third-grade classroom at Fernbrook Elementary School in Osseo, Minnesota.

But thanks to a power wheelchair and a special computer station, the 9-year-old with cerebral palsy and a winning smile gets along just fine. Because Justin has difficulties performing tasks requiring fine motor skills, such as writing on paper with a pencil, he usually types on his own Mac computer, hunting and pecking away with one finger. He motors around the classroom using the power wheelchair, which he operates with his left hand.

Without these supportive technologies, "I don't think Justin would have been able to keep up with the curriculum, and he would have needed to be pulled from class," says Ann Litke, Justin's mother. "With the help of technology, I see him going to college and being able to live really independently."

Known as assistive technologies, tools such as touch-screen computers, voice recognition or "talking book" software and the like, are showing up in more and more general education classrooms like Throndson's. Some of the impetus comes from changes in the Individuals with Disabilities Education Act mandating that schools provide appropriate accommodations (such as assistive technologies) to allow students with disabilities to attend regular education classes. Using the new technologies, some students who would not even have been placed in regular classrooms are not only present-they're also participating in the curriculum and the camaraderie.

But teacher and staff training and collaboration are vital to making the technologies work.

Throndson says she felt pressure to succeed with Justin-without taking anything away from the other kids in the class-before the school year even started. "I was so nervous, thinking, I have never had this type of a disability in my class, " she says.

Fortunately, she got lots of help-from professionals like special education teacher Kelly Bredeken and paraeducator Carla Buckholtz. Before the school year started, Throndson met with Bredeken, who helped her set up the seating so Justin could maneuver his wheelchair easily around the classroom and participate in group tasks with other children. And she turned his desk into a computer station, so he could tap out his assignments on his keyboard while other kids write them on paper.

Throndson also learned to make day-to-day adjustments so that Justin, who has no cognitive impairments, can keep up with the other 24 students in the class. If students are editing sentences, she'll type Justin's sentences directly into his Mac ahead of time, giving him a few more minutes to work while other kids copy from the board. For creative writing assignments, though, "I just leave him on his own," says Throndson. "It takes him a little longer to produce as much but he's an extremely good reader, so when the other kids are finished reading, hell just go back to his story."

"He's a very capable young guy," adds Bredeken. "And that's why technology is so important to him. It gave him a method in which he can demonstrate his knowledge of curriculum."

Like Throndson, Ellen Budish, a kindergarten teacher at Sunrise Park Elementary School in Boca Raton, Florida, has a child in her class using an assistive technology. In her case, Danielle uses a DynaVox, a device resembling a touch-screen computer that provides a voice for children who can't speak. It's easy to use so that even Danielle, who has limited use of her arms, can manipulate it.

Before school started, Budish attended an all-day seminar in a school system office to learn about the technology and how to incorporate it in her classroom. About 30 teachers, paraeducators, and parents attended.

Budish works closely with Colleen Fritts, an augmentative communication specialist, to customize the program for Danielle. Fritts knows that teachers can be intimidated by the devices. "They're usually scared," she says.

But once that nervousness is overcome, the results can be magical. "Ellen is a fantastic kindergarten teacher," Fritts says. "She takes her job extremely seriously, and she wants to do her best for every single student in the classroom. It truly is a success story."

The commitment is just as strong in Throndson's classroom. With adequate support, Justin is making strides. And his classmates benefit from his participation, too-even if they sometimes envy his computer.

"The children are learning from him too," says Throndson. "They are seeing that...he's very smart and there are ways you can work around a disability."

"We're very fortunate to have him," she adds. "He brings us a lot of joy."

LEARN MORE about how to make your curriculum more accessible to all students-for free.

While supplies last, get a copy of NEA's Accessible Classroom Primer CD-ROM. Click away on the CO-ROM and you'll find articles and presentations on assistive technologies and universal design for learning strategies.

You can request a copy from gapsinfo@nea.org. Or save time by downloading the material yourself from www.cte.jhu.edu/accessibility/primer.

Copyright National Education Association Apr 2005
Provided by ProQuest Information and Learning Company. All rights Reserved


Sunday, April 02, 2006

 

Leatherman Multi-Tools-High Quality

Leatherman Multi-Tools-High Quality, Good Prices by Linda Moore

If you are looking for just the right gift for anyone on your list, man or woman, look no further than Leatherman tools. These multi-tools are known the world over for durability, quality and style.

If you do not know what a Leatherman tool is think of a Swiss Army Knife, only better quality. The Leatherman includes useful tools such as needle nose pliers, regular pliers, rulers, scissors, screwdrivers (phillips and flat), tweezers, corkscrews, saws, awls and these are only some of the options that are available in a wide variety of Leatherman tools.


There is a tool for every person on your gift list and every type of situation in your life. For the adventurer, the Leatherman Wave, is almost a must to have. This small tool is only 4 inches long, weighs only 8.5 ounces and is made of stainless steel. For being so compact, the Leatherman Wave really packs a punch with a tool list that includes needle nose and regular pliers, wire and hard-wire cutters, a clip point and serrated knife, a diamond coated file, screwdrivers in various sizes as well as a bottle and can opener, plus several tools that are not listed here. The Wave is a tool he will never want to be without again.


For the younger person on your list the Leatherman Juice or Squirt would be a good choice. These tools come with the same commitment to quality as the Wave, but are available in fun colors. These are smaller Leatherman tools, with several styles and tool configurations to from which to choose.


The Leatherman tools are covered under a 25 year limited warranty, if there is a defect in the workmanship or material of the tool, Leatherman will fix it. However, this warranty does not cover any type of abuse, any unreasonable uses of the tool or alterations that you may have made. It does not cover any accessories, the color finishes or sheaths. If your product fails in workmanship or materials, you need to pay to ship it to Leatherman for repair.


The best way to gauge the quality of an authentic Leatherman tool is to actually hold one, to feel it in your hands. You can find Leatherman tools in a variety of stores, outdoor sports shops will have them, as will some discount chain stores. The Leatherman tools will be in the hunting section. Ask the manager of the area to take it out of the case, play with the tools and judge for yourself how useful this amazing little tool would be for anyone in almost any situation.


To see the complete line of Leatherman multi tools visit them online. They can answer any questions that you may have regarding the tools themselves, the manufacturing process or the tool configurations that are available.


About the Author


Linda Moore writes on a variety of subjects including home ownership, family matters,personal enrichment, leatherman tools and bathroom remodeling ideas


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