Have you checked the pulleys on you woodworking tools - Router Forums
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post #1 of 9 (permalink) Old 02-13-2018, 11:58 AM Thread Starter
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Default Have you checked the pulleys on you woodworking tools

This is the shaft of a Jet 16'' planner motor bought in March 2014.
The key slipped on the shaft this is the result. Now before you say
I hog out to much at one time NO that is not the case. I take small
bites a half to a quarter turn per pass. I called a motor repair and they
could fix it, but said it would cost same as a new motor. So $500.00
later I have a new motor.
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post #2 of 9 (permalink) Old 02-13-2018, 02:05 PM
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Just looks like metal fatigue to me, just a bad metal tempering job
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post #3 of 9 (permalink) Old 02-13-2018, 02:49 PM
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It's a shame the pulley didn't take the hit instead of the shaft - ugh!

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post #4 of 9 (permalink) Old 02-13-2018, 03:53 PM
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Ouch! Looking at the length of the keyway, that was a short key as well... might have been a contributing factor.

Really a moot point now that you have the new motor, but if you know a welder, I don't think that would have been that difficult to repair.
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post #5 of 9 (permalink) Old 02-13-2018, 08:39 PM
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For a motor of mine, I would dis-assemble it and take the rotor and shaft to a friens's machine shop, cut a new keyway on the opposite side of the shaft, re-assemble the motor with a new key and pulley, using blue Loctite on the set screw, probably backing up the set screw with a second on on top of the first to lock the first in place, and put the motor back into service. No way would I buy another motor if I could save this one.

Charley
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post #6 of 9 (permalink) Old 02-13-2018, 10:47 PM
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Quote:
Originally Posted by CharleyL View Post
For a motor of mine, I would dis-assemble it and take the rotor and shaft to a friens's machine shop, cut a new keyway on the opposite side of the shaft, re-assemble the motor with a new key and pulley, using blue Loctite on the set screw, probably backing up the set screw with a second on on top of the first to lock the first in place, and put the motor back into service. No way would I buy another motor if I could save this one.

Charley
Good idea, Charley.

Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #7 of 9 (permalink) Old 02-14-2018, 12:19 AM
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Quote:
Originally Posted by CharleyL View Post
For a motor of mine, I would dis-assemble it and take the rotor and shaft to a friens's machine shop, cut a new keyway on the opposite side of the shaft, re-assemble the motor with a new key and pulley, using blue Loctite on the set screw, probably backing up the set screw with a second on on top of the first to lock the first in place, and put the motor back into service. No way would I buy another motor if I could save this one.

Charley
I know there is a way to rescue that, but can't recall just what it is now, but does involve seeing a machinist. Not your way, but your way should work just as well. A machinist might even know a different way to fix the problem. I'm like you, I would definitely take it to a machinist first.

Somewhere along the line I recall someone drilling thru the pulley and shaft, and putting a bolt thru them. As far as I know whatever it was no more problems with it. I think it was the pulley that went somehow. Don't know if I would recommend that or not, I suppose it would depend on circumstances at the time.

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post #8 of 9 (permalink) Old 02-14-2018, 08:35 AM
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Putting a bolt through the pulley and motor shaft is a good way to destroy both the motor and pulley. There would be no way to tightly join the motor shaft and pulley, and they would tear each other apart in a short time. They repair shafts with bad keyways on very large motors by welding up the damaged area of the shaft and then machining a new keyway, but for a small motor, just cutting a new keyway on the opposite side of the shaft is usually the easiest and cheapest way to save the motor.

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post #9 of 9 (permalink) Old 02-14-2018, 10:47 AM
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I agree that that was repairable. I worked in sales for a machine shop for 1 1/2 yrs and saw some of the older conventional machinists work miracles. Weld to rebuild surface using appropriate welding materials and procedures, then machine to re balance and finally re-cut a new key way. I would still have it done to have a back up motor. The cost would not be anywhere near the new one.

Don't fear your tools, pay attention and respect the tools and avoid injury.
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