Hello Guest it is January 18, 2020, 05:47:46 PM

Author Topic: Z stepper jerky  (Read 9924 times)

0 Members and 1 Guest are viewing this topic.

Offline Garyh

*
  •  19 19
    • View Profile
Z stepper jerky
« on: June 23, 2008, 07:46:26 AM »
Hi all, just built a new router with stepper system and Z axis seems to pulsate when running a 3d file. I have tryed all types of motor tuning with
the same result every time? The Z is 1:1 with ball skrew 5mm x1 rev. lift,X-Y have 34 to 72 belt drive and 26t pinion drives,all drives jog around
the table fine. Cuts 2 1/2 fine but when i try 3d files Z seems to run rough. Any help would be great.cheers.

Offline Chaoticone

*
  • *
  •  5,634 5,634
  • Precision Chaos
    • View Profile
Re: Z stepper jerky
« Reply #1 on: June 24, 2008, 08:09:13 AM »
Are you running straight off the Parallel port? Are you running in Exact stop or Constant velocity more? Can you post your code?

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Garyh

*
  •  19 19
    • View Profile
Re: Z stepper jerky
« Reply #2 on: June 24, 2008, 09:06:51 AM »
Hi Brett, Yeah am running of the parallel port, i don't quite know what Exact or Constant velocity mean but will send you this
Gcode file. Its just a simple curved surface file to test machine.i tryed 3 different computers today but all do the same thing .It seems
to be pulsing in Z and X  and not running smooth. Thanks for the reply.

Offline Chaoticone

*
  • *
  •  5,634 5,634
  • Precision Chaos
    • View Profile
Re: Z stepper jerky
« Reply #3 on: June 24, 2008, 12:38:00 PM »
G61 places your machine in Exact stop mode and G64 places it in CV mode.  There is a G64 in your code which is good.  The code is tiny segments. Have you changed any of the CV settings from dafault Mach?

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Garyh

*
  •  19 19
    • View Profile
Re: Z stepper jerky
« Reply #4 on: June 24, 2008, 06:02:22 PM »
Brett , no i havent changed these settings! It looks like if this stepper system wont play the game i think i will change to a
servo system. Cheers Gary.

Offline Garyh

*
  •  19 19
    • View Profile
Re: Z stepper jerky
« Reply #5 on: June 24, 2008, 06:29:24 PM »
Brett, just got a few pic's of my 650-Z router .The steppers are 2550 oz/in showing reduction drives.

Offline Garyh

*
  •  19 19
    • View Profile
Re: Z stepper jerky
« Reply #6 on: June 24, 2008, 06:34:31 PM »
Brett, just got a few pic's of my 650-Z router .The steppers are 2550 oz/in showing reduction drives.

Offline Chaoticone

*
  • *
  •  5,634 5,634
  • Precision Chaos
    • View Profile
Re: Z stepper jerky
« Reply #7 on: June 24, 2008, 06:50:06 PM »
Thanks Gary, nice looking machine. Any chance you could post a video of it running the code that is giveing you problems? That would help to trouble shoot a lot. Is the path it is running true and just sounds bad or is the z getting out of place?

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Garyh

*
  •  19 19
    • View Profile
Re: Z stepper jerky
« Reply #8 on: June 24, 2008, 07:05:15 PM »
Brett, the path it is running is true but Z & X which are both moving at the same time are both struggling to move smooth.
The feed rate then drops right off.

Offline Chaoticone

*
  • *
  •  5,634 5,634
  • Precision Chaos
    • View Profile
Re: Z stepper jerky
« Reply #9 on: June 24, 2008, 08:48:41 PM »
Gary, please post your xml file and we will have a look.

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!