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Author Topic: Rotary axis, motor tuning calculation  (Read 3384 times)

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Rotary axis, motor tuning calculation
« on: September 03, 2009, 11:45:57 AM »
Hi!
Again a question about my A-axis. In motor tuning configuration screen I can add only steps per mm/inch (depends of the native units). So, I need pure degrees for A-axis. I have 1600 steps per revolution in current case. What should be the digit?
By some tests I find something like 0.55, but this is not precise. Also I want to use all 1600 steps in 360 degrees motion. With another words, 0.225 of degree should be selectable.

Please support me with correct calculation, which covers these needs.

Offline Hood

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Re: Rotary axis, motor tuning calculation
« Reply #1 on: September 03, 2009, 01:33:28 PM »
1600/360 = 4.44444444444444444444444444444444444444444..................  would give you steps per degree

Hood
Re: Rotary axis, motor tuning calculation
« Reply #2 on: September 03, 2009, 02:14:53 PM »
DONE!
After the posting I have to think and get the same result. Thank's a lot for the help.
The problem was on one another place. As usually, the motor driver PDF was wrong and I have worked all time on 200 steps per revolution.


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Sorry, but one more question. How to say to A-axis in tangential mode to rotate with feedrate speed, not with fast move one. If this is possible, the postprocessor will be exactly simpler. Solution to limit the speed for A-axis is acceptable, but like as an "end decision".
« Last Edit: September 03, 2009, 02:27:14 PM by Vaklin »

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Re: Rotary axis, motor tuning calculation
« Reply #3 on: September 03, 2009, 04:06:09 PM »
Are you meaning as in knife control? Afraid I have never used that so dont know anything about it but if you needed to limit the speed you could probably set the velocity in motor tuning at the max you wanted.
Hood
Re: Rotary axis, motor tuning calculation
« Reply #4 on: September 03, 2009, 04:19:00 PM »
Yes. The knife tangent control. Limiting the speed of the motor will not collaborate all time with expected feedrate. Now, using tangent control, I should all time up Z before new line. (Tangent control doesn't work in circles, but this is not necessary at all). Preferred way is to treat tangent control as G1 code before next X,Y,Z movement. Difference is that my "knife" can cut when rotating. Z+, rotate, Z-, cut will give worst results. Doesn't matter how precisely done compensations in G code.

Exactly, this will be useful feature. Will hope to see it in some of next versions. Or it is present yet, but I don't know how to use it?