Hello Guest it is August 20, 2019, 09:00:32 AM

Author Topic: Stepper motor acting funny  (Read 3051 times)

0 Members and 1 Guest are viewing this topic.

Stepper motor acting funny
« on: February 21, 2016, 03:49:08 PM »
Hi Everyone !

I am in need of help big time! My CNC wont move the axes the way it is supposed too. http://abcnc.de/shop/en/detail/index/sArticle/234/sCategory/6

When I use the software that came with my CNC, the axes moves exellent. But their sofftware can only wotk with HPGL, not Gcode. But when I jog the axes in Mach3, the stepper motors just rotate too slow and unaccurate.

What am I missing? I have been researching for 3 days now and I cant figure out what the problem is !

Here is a link to a video, where I am jogging the X-axis. https://www.youtube.com/watch?v=UJtbc8W2dXo&feature=youtu.be



PLEASE help me.

Regards, Beni.

Offline bfgstew

*
  •  105 105
  • DOH!!!!!!!
    • View Profile
Re: Stepper motor acting funny
« Reply #1 on: February 21, 2016, 04:22:15 PM »
You have steps per set at 66 in motor tuning page?  How many steps per rev does your stepper motors do? Normally steppers do 200 per rev.
Re: Stepper motor acting funny
« Reply #2 on: February 21, 2016, 09:41:39 PM »
Hi Bfgstew.
Ya, my stepper does 200 step on a rev, but mach3 only wanna know how many steps it takes for 1 mm. And since my axes have 3 mm pitch, i figured that 200/3 =66,6.

My real problem is how the motor 'ticks' when it rotates.

Offline bfgstew

*
  •  105 105
  • DOH!!!!!!!
    • View Profile
Re: Stepper motor acting funny
« Reply #3 on: February 22, 2016, 02:19:27 AM »
How have connected cnc to pc?
what pc software are you running?
looks like pc and cnc not talking to each other properly.
more info you give better chance of fixing.
Re: Stepper motor acting funny
« Reply #4 on: February 22, 2016, 11:58:56 AM »
My Pc is connected to the CNC via a Parallel Port (LPT).
The PC is an AMD Athlon 1,6 Ghz , 1,25 gb ram, OS windows XP.

Offline Tweakie.CNC

*
  • *
  •  7,884 7,884
  • Super Kitty
    • View Profile
    • Tweakie.CNC
Re: Stepper motor acting funny
« Reply #5 on: February 22, 2016, 12:24:39 PM »
Hi Beni,

I am assuming that your stepper motor controller uses 'microstepping'. At this stage your settings are unknown but it is common to have 1/8th microstepping so set your x and y axes 'steps per unit' (in motor tuning) to 532.8 (66.6 x8). This should make movement less jerky so that you can then use the axis calibration feature (Settings page) to get the correct 'steps per unit' for each axis of your machine.

If necessary, increase the Velocity settings for the x and y axes (in motor tuning) to get a reasonable speed of movement (this can be fine tuned later).

Tweakie.
« Last Edit: February 22, 2016, 12:27:35 PM by Tweakie.CNC »
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Stepper motor acting funny
« Reply #6 on: February 22, 2016, 02:07:15 PM »
Hi Tweakie.

My controller is called a Step2600 ( http://www.digi-vision.de/download/pdf/Stepp2600.pdf ), and came with the machine.

I tried to put 532.8 in steps pr unit, and the x-axis was moving slightly better. But after using the axis calibration, which gave an 133,2 steps pr unit, the motor was back to it old ways with ''ticking'' and ''jerking''.
Could it be my controller card that is simply not made for mach3, or is it possible that the PC is to weak?

Regads, Beni.

Offline Davek0974

*
  •  2,577 2,577
    • View Profile
    • DD Metal Products Ltd
Re: Stepper motor acting funny
« Reply #7 on: February 22, 2016, 04:12:26 PM »
Increase your step pulse and dir pulse to 5 and try it, might work.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: Stepper motor acting funny
« Reply #8 on: February 22, 2016, 05:07:15 PM »
Hi Dave.

I have tried that too, and it had no effect.    I am really thinking about trying to change PC and CNC controller , because  I dont see any other solutions.

Offline bfgstew

*
  •  105 105
  • DOH!!!!!!!
    • View Profile
Re: Stepper motor acting funny
« Reply #9 on: February 22, 2016, 05:28:17 PM »
It does say it is compatible with mach3, but cant really understand it as it is in german and my german is woeful to say the least.
i would double check your settings in your controller and mach3, failing that purchase a standard  breakout board and try that?