525,356 active members*
2,871 visitors online*
Register for free
Login
Results 1 to 7 of 7
  1. #1
    Registered
    Join Date
    Oct 2004
    Posts
    29

    Exclamation Spindle getting HOT

    Hi,

    I am almost done with CNC-ing a Grizzly G8689 Mini Mill. I have X, Y and Z Steppers running, I added a belt drive and replaced the bearings on top and bottom of the spindle. I removed the internal plastic gears that I could.
    I am making Limit and Home mounting brackets, When I cut aluminum, the spindle gets HOT. So hot that it is hard to touch. Is this a result of adding a belt drive or do I have some other issue going on?

  2. #2
    Member
    Join Date
    Jan 2005
    Posts
    11275

    Re: Spindle getting HOT

    Quote Originally Posted by CEStanley View Post
    Hi,

    I am almost done with CNC-ing a Grizzly G8689 Mini Mill. I have X, Y and Z Steppers running, I added a belt drive and replaced the bearings on top and bottom of the spindle. I removed the internal plastic gears that I could.
    I am making Limit and Home mounting brackets, When I cut aluminum, the spindle gets HOT. So hot that it is hard to touch. Is this a result of adding a belt drive or do I have some other issue going on?
    Sounds like to much preload on the bearings, being to hot will damage the bearings
    Mactec54

  3. #3
    Registered
    Join Date
    Oct 2004
    Posts
    29

    Re: Spindle getting HOT

    Thanks Mactec54,

    I looked up Bearing preload and it does seem like that is the reason for the heat.

  4. #4
    Registered
    Join Date
    Jan 2005
    Posts
    1939

    Re: Spindle getting HOT

    Did you perform a break-in of the new bearings?

  5. #5
    Registered
    Join Date
    Feb 2015
    Posts
    31

    Re: Spindle getting HOT

    Get yourself a handheld, IR temperature probe and measure the actual temperature. You will want to verify the bearing temperatures directly if possible. If not, you can probably assume that there's a minimum of 10°F difference increase from the outside of the spindle to the bearing seats. It may be much higher than that.

    Are you still running tapered roller bearings? Or have you installed angular contact bearings?

    Have you increased the RPM you're running at?

    How did you set the preload when you reassembled the spindle?

    The question about spindle break-in is a good one as well.

  6. #6
    Registered
    Join Date
    Oct 2004
    Posts
    29

    Re: Spindle getting HOT

    Hi Mactec54, 109jb and Pariel,

    I fixed my problem with the bearings. I purchased a spindle and bearings from LMS and those were not good parts for my Grizzly Mill. I ordered and installed bearings and spindle from Grizzly and things are running smooth. When I turn the Spindle Speed up to 4100, the bearings get a little warm but not HOT. If I get a chance, I'll install roller bearings but I'm afraid they will have run-out.

  7. #7
    Member
    Join Date
    Jul 2020
    Posts
    0

    Re: Spindle getting HOT

    I got the same problem, my spindle becoming very hot in a few minutes and without any load.
    I found that the number of pole was set to 4 in my VDF while there is only 2 poles for this spindle.
    I should have notice that when the motor speed indicated by the controller was 2 times lower than reality...

Similar Threads

  1. Replies: 3
    Last Post: 10-19-2018, 05:12 PM
  2. Replies: 35
    Last Post: 03-21-2017, 02:29 PM
  3. Replies: 39
    Last Post: 01-09-2017, 06:26 AM
  4. Replies: 5
    Last Post: 07-19-2013, 05:16 AM
  5. mach3 spindle dro not working, spindle speed changing while jogging and running code
    By jasminder in forum Mach Software (ArtSoft software)
    Replies: 0
    Last Post: 02-23-2011, 07:12 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •