Idiots guide to tuning steppers.
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Can somebody make an easy to follow guide or tutorial for tuning steppers.
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Hi,
What exactly do you mean by "tuning"?
Frederick
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@fcwilt said in Idiots guide to tuning steppers.:
Hi,
What exactly do you mean by "tuning"?
Frederick
Getting them setup to run nicely, the guides are vague, to me anyway and I dont fully understand them. I’ve had an immense amount of help but still dont really understand what I’m doing. I’m sure it’s really simple when you understand it but frankly its overwhelming the first time you come into contact with RRF and all of the parameters to set, test, tune and refine, stealthchop, spreadcycle, cool step, currents and how they interact with each other. Trinamic claim our steppers should run quietly yet I can’t get mine to below 50db and I don’t understand why, does that make sense?
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Hi,
Yes given the multiple things that can be adjusted it certainly is daunting.
I haven't done anything outside of speed, acceleration and jerk.
The steps/mm (M92) is a fixed value that can be determined via calculation and calibration.
Current M906) is fairly simple given that the steppers have a rating and you should not normally exceed 80% of that rating. So start at, say, 40% and adjust upwards by 5 as needed.
For speed, acceleration and jerk if you don't set those they default to some useful values.
You can then execute from the DWC Console M201 (acceleration), M203 (speed) and M566 (jerk) to see the default values.
Speed doesn't seem to be terribly important as in actual printing other factors come into play limiting the speeds during print to less than your max.
I use 12000 for X and Y and 1200 for Z.
There are many articles on setting "jerk" and they often don't even agree on the explanation of what jerk is - they may be saying the same thing but it may not sound like it.
Here is one paragraph on jerk that I think may be helpful:
"In 3D printing, jerk is used as a threshold for minimum speed requiring acceleration. For example, a standard jerk value of 20 mm/s will make any move below 20 mm/s without acceleration. This happens often when an infill line is very short and the 3D printer will vibrate extremely quickly"
I did some basic tests with the jerk setting. One sites suggestion to use 20% of the max speed (M203) made my printer noisy and it shook a lot. I didn't like it. I rather have quiet and smooth even if it means it takes longer to print things.
Good luck and keep asking questions - there are many knowledgeable folks here ready to help.
Frederick
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@carcamerarig see the pinned categories here: https://forum.duet3d.com/category/7/tuning-and-tweaking
Particularly https://forum.duet3d.com/topic/6181/tuning-macros-menus-accel-jerk-retraction-pressure-advanceIan
