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Use a 3/8'' reversible drill to power winch bidirectional

Hello, I have a new invention which utilizes a worm gear winch for raising and lowering a device. I wish to motorize it but finding a suitable reversible gear motor seems too expensive. A inexpensive 3/8' reversible drill does the job quite well with torque and rpm just about right. Problem is that I have to be able to wire into it so that my two limit switches send current to accomplish the bi-directional operation. My thought was to just fix the trigger full back for speed. I note that there are 4 wires coming from the switch, one to each bushing and one to each side of the armature. Am I correct in assuming that if I switch the wires to the motor (armature) (cut and cross them) that will result in changing the direction of rotation. If so, then I should be able to wire my limit switches so that when one is closed current flows one way and then the other when the other switch is closed. Am I thinking right here or am I missing something as usual. Would I need to also switch the wires to the bushes? Is the current going to the armature 110 AC or is it converted to DC current. Thanks, Larry Langston

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Yes and DC.

Posted on Jul 29, 2009

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Lost ability to raise the blade for operation.


Most often this is caused by the handle or wheel that is used to raise/lower the blade coming loose on the shaft that operates the worm gear in the trunnion. There is frequently an allen set screw that locks this wheel onto the shaft and this set screw comes loose or is lost. If loose, simply tighten it.
Otherwise, it may be time for some routine maintenance. Unplug the saw, clean all sawdust and debris from under the saw using compressed air if possible, and then lubricate the worm gear/gear box and trunnion ways. Some people prefer silicone for this, some use WD40. I prefer normal motor oil. In any event you will need a long oil spout to direct the lubricant into the worm gear and gears, then/while raising and lowering the saw. Also lubricate the angle adjustment gears.
If you keep your saw properly lubricated, it will function easily and be a joy to adjust. Otherwise, it can become a struggle or just impossible.
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I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Jul 26, 2011 | Saws

1 Answer

My powermatic table saw is very hard to raise and lower the blade and i have removed the knob that tightens the handle so the blade does not move and its still very difficult to move the blade


You need to do some maintenance on your saw. First unplug it. Then blow out the sawdust from inside the saw, especially around the trunnion ways and gears and worm gears that engage them to raise/lower and tilt the saw. Use a good quality lubricant to lube these worm gears and the shafts and pivot points. I use motor oil, have for years, and find it does a better job and lasts longer than any kind of grease or silicone. Use an oil can with a long spout so you can direct the oil where needed, then move the saw up/down or right/left to work the oil into the worm gear and mechanism. In a pinch WD40 is fine, though it won't last as long. Periodic re oiling will maintain the mechanism in peak condition, and the drops of oil you spill in the process won't do any damage to your so. No, it won't get gummed up with sawdust. Try it, you'll like it.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Jul 08, 2011 | Powermatic Saws

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I have cleaned the worm and Gear segment for blade raising mechanism on my 66 and it still binds and is stiff. What do I do next?


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--W/D--

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It sounds like you have broken a pinion tooth. Remove the screw from the end housings and open to inspect the drive gears. Parts can be purchased from Superwinch for these or off e-Bay.

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1 Answer

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Take your voltmeter and verify your voltage at the switch. If it is 11.5 or better, try reversing the motor. Reverse direction requires less ampreage to run and should work fine, then try forward or wind.

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on some models, the adj. handle/wheel has to be pushed in in order for the gear to engauge

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