Need help with vmc760


Results 1 to 14 of 14

Thread: Need help with vmc760

  1. #1
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Need help with vmc760

    I am new to the forum. I just got my 1996 Bridgeport VMC760 22 under power. Every thing works but I do have a (spindle not up to speed in time) alarm. The spindle oscillates for about 5 sec. Any pointers would be great. I have no problem getting my hands dirty. Thanks

    Similar Threads:


  2. #2
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5717
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    Is it possible that the spindle is cold and needs to warm up a bit before you bring it up to cutting speed? Maybe lubrication?

    Jim Dawson
    Sandy, Oregon, USA


  3. #3
    Member
    Join Date
    Feb 2009
    Location
    usa
    Posts
    6028
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    Since its a new to you install, I'd guess incoming power issue or possible reversed phase depending on spindle drive type and control.

    Sent from my SM-T813 using Tapatalk



  4. #4
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    I have 208 3 phase. I have not check the phase rotation with a gauge yet. I think it is correct because the tool carousel is depending on correct rotation and that work as it should. I can not get the spindle to spin at all with any command. M03 or M04 and if I give it M19 It will just continue to oscillate but will not alarm out with a M19. Thanks



  5. #5
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5717
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    208 could be the problem. Is the machine wired for 230? Is there a transformer that has different taps to adjust the voltage to the spindle?

    Jim Dawson
    Sandy, Oregon, USA


  6. #6
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    yes there is a transformer with a 200-210 post.



  7. #7
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5717
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    That might fix it.

    Jim Dawson
    Sandy, Oregon, USA


  8. #8
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    The spindle load is 160% when it is oscillating. Does it have a brake on the spindle? The spindle spins free by hand.



  9. #9
    Member
    Join Date
    Feb 2009
    Location
    usa
    Posts
    6028
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    A few things cause this, but if you keep just trying to start it, you will blow the spindle drive, if not already.

    You have yet to give info on control type, spindle drive type etc, so kinda hard to help.

    1. Voltage
    2. Spindle trying to start in the wrong direction
    3. Velocity Feedback system for the spindle/motor not working.
    4. Blown transistors in the spindle drive.

    Sent from my SM-T813 using Tapatalk



  10. #10
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    I have wires connected to the 200-210 voltage tap already.



  11. #11
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    Sorry DX32 control and siemens drive



  12. #12
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    Just an update my spindle logic board was the problem. I did notice something if you stop the spindle with the stop key it will alarm out. (spindle not up to speed in time). M19 will orientate the spindle just fine. Any info on the would be great. Thanks



  13. #13
    Registered
    Join Date
    Oct 2011
    Location
    Canada
    Posts
    24
    Downloads
    0
    Uploads
    0

    Default Re: Need help with vmc760

    if spindle is oscillating a bit on orientation around encoder index flag m19 then parameters in bmdc may not tuned...correctly which gives not up to speed error < velocity sample rate etc.......><spindle gain> maxspeed etc or the 611 drive params can get messed if touching the simo drive



  14. #14
    Member
    Join Date
    Nov 2017
    Location
    United States
    Posts
    9
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by service_75 View Post
    if spindle is oscillating a bit on orientation around encoder index flag m19 then parameters in bmdc may not tuned...correctly which gives not up to speed error < velocity sample rate etc.......><spindle gain> maxspeed etc or the 611 drive params can get messed if touching the simo drive
    Thanks for the reply. I found that by spindle drift with the spindle command of 0 rpm was way off it was -18 RPM so I adjusted the spindle drive accordingly. Everything works perfectly now.



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
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Need help with vmc760

Need help with vmc760