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Jet 20-10 Conveyor Motor

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Forum topic by DrHalfhand posted 11-13-2017 05:44 PM 170 views 0 times favorited 3 replies Add to Favorites Watch
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DrHalfhand

2 posts in 1084 days


11-13-2017 05:44 PM

Topic tags/keywords: drum sander motor dc help

hi everyone,

Just wondering if anyone can tell me how to fix the following: I let my younger brother use my Jet 10-20 drum sander, unsupervised, and he switched off the sanding drum but did not completely turn off the conveyor motor. It was left barely turned on for about 2 hours. When I finally noticed it, it seems like the motor will not crank any harder past about 60% on the dial and produces a whine like something’s slipping. It’s a 1/3 HP DC motor, and I’m not too worried about replacing it since it will still move things through the machine, but just thought someone who knows more about DC motors or that sander in particular might be able to tell me what went wrong.

Thanks,

Dr. H.


3 replies so far

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splintergroup

1634 posts in 1035 days


#1 posted 11-13-2017 09:54 PM

Those conveyor motor drives are a simple light dimmer type circuit. Common failures here are the Triac/Diac and rectifiers. These cost a few bucks each if you decide to replace them yourself. Be aware that the official “replacement” part from Jet includes the entire motor/controller for several hundred $.

If it still works fine (I usually stay below 40%), I don’t see any downside to continuing to use it. One bad thing will be your un-expected down time when it does completely fail.

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DrHalfhand

2 posts in 1084 days


#2 posted 11-13-2017 10:07 PM

Are those parts inside the motor or on the control/circut board? Am I right in thinking the triac/diac is likely behind the variable control dial?

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splintergroup

1634 posts in 1035 days


#3 posted 11-13-2017 10:38 PM



Are those parts inside the motor or on the control/circut board? Am I right in thinking the triac/diac is likely behind the variable control dial?

- DrHalfhand

Circuit board. The motor and gearbox are separate.

My 16/32 has a small round circuit board directly behind the speed dial. It may be a good idea to peek inside and see if anything obvious shows up.

The other things that could cause problems, but less likely based on your tale, is the speed control rotary has a dead spot on its internals or the motor brushes are somehow worn down. I’d probably pop these out first since they are easy to get to.

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