584,805 active members*
5,102 visitors online*
Register for free
Login

Thread: No minus Z

Results 1 to 3 of 3

Hybrid View

  1. #1
    Join Date
    Mar 2004
    Posts
    16

    No minus Z

    I have an old cnc wood router I built with ideas from this site several years ago. It worked ok till now. I run master5(from art before mach); using stepperworld's sp-3 and little japan servo steppers. Was quite cheap at the time but ok for light work. Now when I run a program Z will go positive for clearence but will not go negative into the work. The program waits for Z- and the DRO shows its moving but it doesn't. While a g-code program is running there is no holding torque on the Z motor. I swapped Z motor for Y still has no torque on Z.(I can spin the motor with my fingers). Here's the kicker, the Z axis will jog up or down with holding torque on the motor as long as a g-code isn't running or in manual! I am stumped. Any help? Thanks Paul.

  2. #2
    Join Date
    Jun 2009
    Posts
    35

    Post

    I have a few thoughts. Since I haven't see the drives themselves, I don't have enough information to fully answer your question, so I'll respond with more questions.

    Does the drive have an enable signal? It seem interesting that the drive produces no holding torque in one direction only. Since you swapped motors, this is not a motor problem, it's likely drive or controller related.

    Have you tried to swap drives? Perhaps the controller is not providing an enable signal to the drive - this would be especially true if the enable signal was tied to the direction signal. It would display this exact symptom.

    Does jogging go through a handwheel or manual pulse generator that is different than under CNC control? This would be another piece to the puzzle. Specifically, how do you jog the axes?

    Please keep me up to date.

    Matt

  3. #3
    Join Date
    Jan 2007
    Posts
    355
    Paul,

    Check your software settings. It could be a function called "Z neglect" which will ignore Z axis commands while active.

    Some industrial CNC's offer this feature, too.
    Diplomacy is the art of saying "Nice doggie" until you can find a rock. - Will Rogers

Similar Threads

  1. axis goes plus or minus on it's own
    By glentner in forum CNC (Mill / Lathe) Control Software (NC)
    Replies: 1
    Last Post: 09-28-2013, 03:45 AM
  2. "Y minus" loses steps on accelleration
    By Mal Buckmaster in forum DNC Problems and Solutions
    Replies: 3
    Last Post: 06-08-2009, 12:56 PM
  3. Y axis moves minus but not plus
    By daedalus0x1a4 in forum Bridgeport / Hardinge Mills
    Replies: 1
    Last Post: 05-04-2009, 05:00 PM
  4. Plus and Minus Reversed
    By cncboss6 in forum Mach Wizards, Macros, & Addons
    Replies: 2
    Last Post: 04-07-2009, 02:31 AM
  5. Starting at MINUS Z depth problem
    By SScnc in forum Vectric
    Replies: 5
    Last Post: 09-21-2008, 02:58 AM

Posting Permissions

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