Need Help! Z axis slowly dropping during cut.


Results 1 to 3 of 3

Thread: Z axis slowly dropping during cut.

  1. #1
    Registered
    Join Date
    Nov 2016
    Location
    South Africa
    Posts
    39
    Downloads
    0
    Uploads
    0

    Default Z axis slowly dropping during cut.

    Hi,

    I am at my wits end with this machine.
    Any assistance will be greatly appreciated, even if it's just suggestions as to what I should try next to troubleshoot.

    When I send 2d cuts to the machine it runs flawlessly.
    When I try the same with 2.5d cuts the cutter drops ever so slightly each time it steps over on x or y.

    The machine is a rather old Kuhlmann with a CX268 controller and I am using Besgrav Via RS232 on Windows XP to send information to the controller.
    It has been retrofitted/upgraded a few times over the years and some parts have been replaced.

    X and Y are both Bautz servo motors while Z is an Electro-Craft.

    I have so far tried the following:

    Different Computer.
    Different version of Besgrav.
    Took the Z Servo off and checked bushes, tightened the the brake and encoder to the motor properly.
    Double checked my Comm port cables and hardware settings.

    I will add images in subsequent posts as the last time I tried adding them all at once the page timed out.

    The odd thing is that if I let the machine run at full speed (test cuts into perspex/plexiglass at 1500mm/min) this does not happen.
    When I try to slow things down for cutting into metal with a .15mm cutter (400mm/min) I start getting the problem.

    Similar Threads:


  2. #2
    Registered
    Join Date
    Nov 2016
    Location
    South Africa
    Posts
    39
    Downloads
    0
    Uploads
    0

    Default Re: Z axis slowly dropping during cut.

    The cavity was milled out in 2d and then I attempted to add a texture to the bottom using a raster strategy.
    When that failed I tried an offset strategy starting from the centre.

    Whole die.
    Z axis slowly dropping during cut.-whole-cut-jpg

    Raster cut (Note how it is cutting downward).
    Z axis slowly dropping during cut.-focus-raster-2-jpg

    Offset cut (Looks a bit like a pyramid).
    Z axis slowly dropping during cut.-focus-offset-jpg



  3. #3
    Registered
    Join Date
    Nov 2016
    Location
    South Africa
    Posts
    39
    Downloads
    0
    Uploads
    0

    Default Re: Z axis slowly dropping during cut.

    This is what is left of the Z Servo Label.
    Sadly I can not read the model number off there and searching for the partial number I can find is not giving me any results on their webpage or via google.
    Z axis slowly dropping during cut.-electro-craft-label-jpg

    I have a Bautz motor that I want to try and replace this motor with but as I have no idea what it's wiring is I do not know how to wire the bautz.
    All the cabling from the cnc machine was black and white and also unmarked (I have marked it myself but there is no help from the machine as to which cable is which and I don't really want to try and guess.

    If anyone knows these motors please assist.

    Oh, here is the Encoder currently on the Z motor. I will have to use that as well as the brake with the replacement motor.
    Z axis slowly dropping during cut.-encoder-jpg



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

Z axis slowly dropping during cut.

Z axis slowly dropping during cut.