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Posted on Question about Grizzly 0490x 8" jointer

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Kort

4 posts in 869 days


#1 posted 07-07-2012 10:23 PM

DannyB: Thanks for the link. I might go ahead and try changing the belt. I find it very irritating that it does that though. Do I have to change the pulleys to match the V style belt or is it a direct replacement?

MrUnix: The slapping comes probably between 5-10 seconds after the motor is cut off so I’m not sure it is related to a centrifugal switch (based on the link you posted). I don’t notice any surging sound from the motor or any prolonged running of it either after I hit the off switch. I do think that it is a possibility that motor breaking is playing a role in the sudden belt slapping at a certain rpm after motor cut off. I am going to research that route also.

JJohnston: it is a ribbed style belt.
Thank you guys for the help. This thread has been more helpful than customer service so far. When I talked to the technical support guy at Grizzly, he acted like it was an unusual problem and it could only be based on how the pulleys/belt was aligned. I had read about this issue before my purchase but it was from an older thread and I assumed that technical support would have had a fix for the issue. As of now, I’m leaning toward DannyB’s posted link:
“I got a call from the Grizzly tech department yesterday. They said that some(got that? some?) of the motors on the G 0490 have an electro-mechanical problem that causes the motor to generate electric after it is powered down and the rpm’s are returning to zero, causing the offending shudder(vibration). They said that although they didn’t think this would harm anything(I think it will) that they would be willing to send me a new motor.I got a call from the Grizzly tech department yesterday. They said that some(got that? some?) of the motors on the G 0490 have an electro-mechanical problem that causes the motor to generate electric after it is powered down and the rpm’s are returning to zero, causing the offending shudder(vibration). They said that although they didn’t think this would harm anything(I think it will) that they would be willing to send me a new motor.”

This might also be the same thing that MrUnix is talking about. If so, I would like to know what makes it happen in some motors and not others. Also, is there any potential long term damage to the motor from this abrupt breaking? Thanks again guys. It’s awesome that other people are so willing to help out!

Mike


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