lathe VS modulation - Woodworking Talk - Woodworkers Forum
Thread Tools Display Modes
post #1 of 5 Old 04-28-2010, 12:57 PM Thread Starter
Junior Member
Join Date: Apr 2010
Posts: 1
View garyrose's Photo Album My Photos
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.


Gary Rose
Corcoran, CA
garyrose is offline  
Sponsored Links
post #2 of 5 Old 04-28-2010, 05:04 PM
Senior Member
Join Date: Sep 2007
Location: Baxter, Tennessee
Posts: 3,257
View john lucas's Photo Album My Photos
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.
john lucas is offline  
post #3 of 5 Old 04-28-2010, 10:38 PM
Just makin chips fly
Join Date: Mar 2008
Location: FL an NC
Posts: 642
View The woodsman's Photo Album My Photos
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
The woodsman is offline  
Sponsored Links
post #4 of 5 Old 04-29-2010, 02:46 PM
Splinter Cushion
Join Date: Feb 2009
Location: Huntsville, AL
Posts: 661
View b00kemdano's Photo Album My Photos
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?
b00kemdano is offline  
post #5 of 5 Old 04-29-2010, 05:11 PM
Senior Member
Join Date: Nov 2007
Location: central illinois
Posts: 912
View jdixon's Photo Album My Photos
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

jdixon is offline  

Quick Reply

Register Now

In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
new lathe stand for my old lathe hughie Woodturning 3 05-03-2009 08:55 PM
PSI Lathe CivilEngineer13 Woodturning 5 03-12-2009 02:02 PM
old lathe frankp Woodturning 4 08-30-2008 12:49 PM
Hot of the lathe littlebuddha Woodturning 4 05-02-2008 07:57 AM
Help with new lathe Umpqua Woodturning 1 02-15-2008 12:56 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome