Proper maintenance of your power tools is essential. Doing so not only helps extend the life of your tools but increases your chances of finishing that project with all of your digits. Norm “Ten Fingers” Abram from This Old House magazine has some suggestions.
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I Remember When…
Old circular saws used to have grease cups and a lubrication schedule you really had to follow if you wanted your saw to last. Power tools these days don’t take nearly that much care, but you still need to treat them decently-keep them clean; don’t drop them. Here are some other common-sense things I do regularly with my tools so that they’ll continue to give me their best work.
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Clean Contacts for Motors
Most small power tools have two “brushes,” solid blocks of carbon graphite that conduct electricity to the motor’s spinning armature. Friction gradually wears these brushes away, and if they’re not replaced, the motor loses power and eventually quits. You can tell it’s time for new brushes when you see lots of arcing-small, harmless sparks inside the motor housing as the tool is running.
Replacing worn-out brushes is easy if your tool has brush covers-the two black caps on opposite sides of the motor housing. Always replace both brushes at the same time. I buy my replacements from the manufacturer; it’s the best way to ensure they’re exactly the right fit. If your tool doesn’t have brush covers, you’ll have to let a repair shop do the work.
Brush away any dust and debris from the brush cover, then unscrew it with a flat-blade screwdriver or coin. As the cap loosens, rest a finger on it; the spring-loaded brush can pop loose suddenly.
Pull out the brush and its attached spring. Vacuum the cap area to remove any sawdust that may have come out with the old brush, then slip the new one in. Tighten the cap against the spring and test the tool.
TOH Tip: Tempting as it is to blow away dust with a blast of compressed air, I don’t because it can drive particles into the switch or other sensitive areas.
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Power-Tool Care Checklist
Every time you use a tool…
- Brush, vacuum, or wipe off dust; the same goes for battery chargers.
- Inspect power cords for nicks; replace cords with frayed jackets or exposed wires.
- Check that all moving parts work smoothly.
- Tighten any loose screws or bolts; put a drop of Loctite on the threads to keep them in place.
- Test a circular saw’s blade brake; it should stop the blade when you release the trigger.
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At the end of the year…
- Look for cracks in motor housing; don’t use a tool with cracks larger than a hairline.
- Lubricate parts where metal rubs on metal.
- File any nicks in the shoe plates of jigsaws and circular saws.
- Flatten bent shoes with Vise-Grips; use a combination square to check that the shoe is perpendicular to the blade.
- Follow the instruction sin each tool’s manual for specific maintenance procedures.
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