4th Axis


Results 1 to 5 of 5

Thread: 4th Axis

  1. #1
    *Registered User* vic014's Avatar
    Join Date
    Jul 2018
    Posts
    2
    Downloads
    0
    Uploads
    0


  2. #2
    Registered dharmic's Avatar
    Join Date
    May 2015
    Location
    Australia
    Posts
    1119
    Downloads
    0
    Uploads
    0

    Default Re: 4th Axis

    Depends what it's starting at and what mode you're in. If you're in incremental mode or start at A 000 on the DRO in absolute mode, G00 A360 should spin one revolution.

    If it's not, then you need to modify the axis settings for A to change the steps per unit setting until you get exactly one revolution.



  3. #3
    Registered
    Join Date
    Dec 2011
    Location
    United States
    Posts
    2
    Downloads
    8
    Uploads
    0

    Default

    Quote Originally Posted by dharmic View Post
    Depends what it's starting at and what mode you're in. If you're in incremental mode or start at A 000 on the DRO in absolute mode, G00 A360 should spin one revolution.

    If it's not, then you need to modify the axis settings for A to change the steps per unit setting until you get exactly one revolution.
    I’m using the cncusb program for the 3040t, there is a calibration setting for the axis’s, I’ve calibrated A, going to be alot of trial and error to get it right



  4. #4
    Registered dharmic's Avatar
    Join Date
    May 2015
    Location
    Australia
    Posts
    1119
    Downloads
    0
    Uploads
    0

    Default Re: 4th Axis

    How have you calibrated A? By actually measuring a full revolution or by calculating it based on number of steps per revolution on the stepper, multiplying by any ratio of reduction pulley or gearbox etc? And, if the latter, did you take into account the microstepping multiplier?

    If you have a tool height probe set up on your machine, you can put a bit of spring wire in the chuck jutting out sideways, do a G31 A360 until it touches, set zero, then G00 A*** to get past the probe, then do another G31 A360 until it touches again. At this point, multiply the steps per unit by 360.0 / (whatever the A DRO says) and you should be durned close.



  5. #5
    Registered Littlemango's Avatar
    Join Date
    Feb 2014
    Location
    Newark
    Posts
    11
    Downloads
    0
    Uploads
    0

    Default Re: 4th Axis

    I just printed this degree wheel at about 2.5 inches Clymer Degree Wheel cut it out with a hole in the middle and stuck it on the pulley. then grabbed whatever was close to set a wire to lay there pointing at a mark on the wheel. Did the same thing as the end of dharmics post for 360.
    Then repeated the process for 720, then 7200, then 14,400. Might not be dead on but looking dead on over 40 turns was close enough for me


    If youve got the little 2:1 reduction belt type rotary axis on your 3040 then your steps per unit are probably going to wind up somewhere around 8.88xxxxx



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

4th Axis

4th Axis