lathe VS modulation - Woodworking Talk - Woodworkers Forum
 
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post #1 of 5 Old 04-28-2010, 12:57 PM Thread Starter
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lathe VS modulation

I just bought a used Jet 1642 and I noticed that when I was running about 1275 rpm it will modulate up to 1600+ rpm and then back down again. I don't know if it does it at other speeds yet. I applied belt dressing to the drive belt and that seemed to stop it for a while, although I didn't really think slippage was the problem. The lathe is in excellent condition and I bought it from a reputable person. Is this a common problem? Anybody know what to do about it? It doesn't happen often, but I just don't think it should happen at all. Any help would be appreciated.

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Gary Rose
Corcoran, CA
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post #2 of 5 Old 04-28-2010, 05:04 PM
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I've demo'd on a lot of 1642's and have not noticed that problem. If you tensioned the belt it should not need the belt dressing. If it only happens at one speed can you just raise or lower the speed a little and make it go away? I'd watch it closely. It could easily be some setting on the controller that needs to be reset. If it keeps doing it call Jet and ask. They may be able to help.
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post #3 of 5 Old 04-28-2010, 10:38 PM
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Lathe VS Modulation

I am not in any way familiar with this lathe,so if this is a dumb suggestion ,sorry but is there a possability that there is a loose pully that may be slipping? just a thought.

God Bless all
Ken Ward
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post #4 of 5 Old 04-29-2010, 02:46 PM
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No idea if this will help, but I'll tell you about my Grizzly.

I had trouble making speed adjustments, so I popped the belt housing cover off and inspected. The pulleys are cone shaped and the tension applied by the speed adjustment lever changes the spread of the cones, thus the diameter of that pulley. Anyhoo, the spring loaded conical pulley assembly on the motor side was not moving the way it was supposed to. I removed the belt, removed the pulley halves and spring from the motor shaft (with moderate difficulty) and cleaned all the dried up assembly grease from all the parts, relubed it, then reassembled the whole shabang.

It has been working like a champ since. Maybe yours has a similar problem?
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post #5 of 5 Old 04-29-2010, 05:11 PM
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Gary, I have a 1642 and have never encountered the problem you are speaking of. Best bet would be to contact Jet tech support and see if they can assist. They are really very helpul. They can be reached at: 1-800-274-6846

John
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