- Configuring LinuxCNC
- Basic Configuration
- Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need
Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need
12 Mar 2023 21:48 - 12 Mar 2023 21:50 #266518
by Absurd
Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need was created by Absurd
Hi there,I have a self-built CNC
www.unclephil.de/volksfr%C3%A4se-vf1/
in 850x650mm. Last week, I installed glass scales and noticed strange speed oscillations on the X and Y axes (see screenshot). Both axes use timing belts and steppers set to 6400 steps per revolution. The oscillations are particularly severe at 1000mm/min and are visible. The Z-axis, which is driven by a ball screw, does not have these issues. I have attached my configurations for reference.
Here's what I have tested so far:
Here's what I have tested so far:
- Various settings (speeds and accelerations)
- Removed motor (runs normally)
- Tensioned timing belt
- Moved X-axis without the motor (moves easily)
- Checked all screws
Last edit: 12 Mar 2023 21:50 by Absurd.
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12 Mar 2023 22:22 #266520
by rodw
Replied by rodw on topic Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need
I think its likley to be resonance from the stepper becasue you are using direct drive and from what I can work out 64mm of travel per revolution.
I initially made the same mistake.
Ref: forum.linuxcnc.org/30-cnc-machines/31509...pinion-drive?start=0
You'll see I made a 3:1 reduction that fitted where the motor was...
I initially made the same mistake.
Ref: forum.linuxcnc.org/30-cnc-machines/31509...pinion-drive?start=0
You'll see I made a 3:1 reduction that fitted where the motor was...
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12 Mar 2023 22:42 #266522
by Absurd
Replied by Absurd on topic Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need
Thanks for your answer. If I'm not mistaken it's 90mm travel per revolution. (71 steps per mm, 6400 steps per revolution). A Higher Value would be better in this regard, right?
I ordered Ball screw mounts and Ball screws with 5mm pitch last week actually. This would be still a direct drive. Would this setup also be prone to these problems?
I ordered Ball screw mounts and Ball screws with 5mm pitch last week actually. This would be still a direct drive. Would this setup also be prone to these problems?
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12 Mar 2023 23:40 #266523
by tommylight
Microsteps are not steps, they are small move in between the actual steps.
Direct drive for this is OK, and most machines use this way of driving.
And, no problems with this setup, no flex so no vibrations.
Replied by tommylight on topic Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need
That is utterly unusable for anything with any mass, and it is not 71 steps/mm, it is 2.2 steps/mm.Thanks for your answer. If I'm not mistaken it's 90mm travel per revolution. (71 steps per mm, 6400 steps per revolution).
Microsteps are not steps, they are small move in between the actual steps.
Of what? Microstepping? See above.A Higher Value would be better in this regard, right?
This is very usable for a mill, even 10mm pitch is still good.I ordered Ball screw mounts and Ball screws with 5mm pitch last week actually. This would be still a direct drive. Would this setup also be prone to these problems?
Direct drive for this is OK, and most machines use this way of driving.
And, no problems with this setup, no flex so no vibrations.
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- Strange Speed Oscillations on X and Y Axes with Timing Belts and Steppers - Need
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