Stepper Motors Oscillating

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5 years 2 months ago #216732 by tjones
Replied by tjones on topic Stepper Motors Oscillating
Reading a few other posts it looks like there is some things that setting FERROR and MIN_ERROR can help by setting these correctly. I am not sure I have ever rally touch the FERROR and MIN_ERROR as I have never had issues with them. On all three axis is was set to .5 and .05. I decided to increase just the X axis to .5 and .5 and that tool went all over the place. So I set the X axis back to .5 and .05 Then I tried .5 and .06 on the Y axis and then I got a following error on Joint 1. I think I only ever had a following error on Joint 1. It seems like making MIN-ERROR larger I get more issues. After reading the manual on this it looks like this is the setting that will physically slow down the feed rate in order to hit the projected path. I also use G64 all the time with P.001. What is the relationship between G64 and MIN-ERROR? I mainly use the G64 because it makes the motion bath so much smoother and significantly reduce the burning in the corners I get from wood.

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5 years 2 months ago #216751 by PCW
Replied by PCW on topic Stepper Motors Oscillating
Can you post your current hal/ini files?

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5 years 2 months ago #216755 by tjones
Replied by tjones on topic Stepper Motors Oscillating
Files below.  I was going to try uncommenting the setp pid.x.maxerror .0005 line and reduce my MIN_FERROR to something smaller and see if that does anything. 

 

File Attachment:

File Name: Tosh-Mill_...8-02.hal
File Size:10.02 KB
 

File Attachment:

File Name: Tosh-Mill_...8-02.ini
File Size:4.34 KB

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5 years 2 months ago #216757 by PCW
Replied by PCW on topic Stepper Motors Oscillating
None of those PID max error settings should cause oscillation

The ferror settings only set the threshold for shutdown
from a following error. If you get a 0.05 inch following error
something is really wrong.

Do you ever get latency errors?

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5 years 2 months ago #216758 by tjones
Replied by tjones on topic Stepper Motors Oscillating
Not while actually machining anything. The only time I have gotten a latency error or note is at startup, but it hasn't effected anything. The stepper drivers I am using are the longs motor ones for Nema23. I did have issues with latency when I was using the parallel port BOB. After checking jitter and such and got that solved. Never had any issues with the 7i76E in that regards. My stepper settings could very well be wrong.

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5 years 2 months ago #216780 by PCW
Replied by PCW on topic Stepper Motors Oscillating
Can you try adding these statements to your hal file to see if it improves
the oscillation issue:

setp hm2_7i96.0.dpll.01.timer-us -100
setp hm2_7i96.0.stepgen.timer-number 1

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