Jigsaw gear position - Woodworking Talk - Woodworkers Forum
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post #1 of 10 Old 06-28-2020, 12:28 AM Thread Starter
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Jigsaw gear position

Greetings, I have an old Sears Craftsman Jigsaw, model 315.231120. I opened it up to add more grease but the two gears inside came apart before I could mark their positions. This might be a long shot but I am hoping someone knows how these gears go back together. I randomly placed them in for the picture below.
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post #2 of 10 Old 06-28-2020, 08:42 AM
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Sometimes the gears are marked with a tiny dimple near a tooth indicating alignment. If no markings, i'd start with the two rollers on the gears next to each other, and check for vibration. If that doesn't work, and no owners manual info, it's cut and try. One of those gears drives the blade, the other one drives the counterweight.
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post #3 of 10 Old 06-28-2020, 11:41 AM
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I agree with Alchymist, before testing with power... rotate the motor by hand through a complete cycle to make sure the two counteracting parts do not collide.

Gary

Woodworking is like wetting myself....Only I know that warm feeling!
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post #4 of 10 Old 06-29-2020, 09:02 AM Thread Starter
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Thanks. I will give it a try.
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post #5 of 10 Old 06-29-2020, 09:28 AM
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my guess is to install gears with the two driven slots as far apart as possible , or as close together as possible, to provide the 180 degree phase

Retired engineer-bureaucrat in Oakland, CA. Been working with wood since the 1960's.
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post #6 of 10 Old 06-29-2020, 09:30 AM
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let us know what worked so we will know
if this issue ever comes up again.

.

there is no educational alternative to having a front row seat in the School of Hard Knocks.

Last edited by John Smith_inFL; 06-29-2020 at 09:34 AM.
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post #7 of 10 Old 06-29-2020, 09:54 AM
where's my table saw?
 
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I found it on You Tube

This video shows the gear positions when he disassembles it at 2:43 in:
https://youtu.be/nwRmD-mOZxU?t=163


The full video here:

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #8 of 10 Old 06-29-2020, 05:03 PM Thread Starter
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Thanks

You helped me realize that the top roller was for the counter weight and needed to be moving the opposite direction of the blade. I placed the two rollers next to each other so the counterweight would be moving up while the blade moved down. It works perfectly. Thanks for all the advice.
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post #9 of 10 Old 06-30-2020, 11:18 AM
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I have the same saw as the video that Woodnthings posted, That gave me a better understanding of what is involved if I ever need to re grease mine. Thanks!

Alchymist gave the first clue... about the counter weight involved... made sense, Thank you also.

Gary

Woodworking is like wetting myself....Only I know that warm feeling!
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post #10 of 10 Old 06-30-2020, 02:30 PM
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