Centroid Community CNC Support Forum

I assume the flat spots in the step output with smoothing enabled was reproducible? I still have to run smoothing to even use this machine at all.


Nope, not able to reproduce the flat spots yet. Does that test.nc program you posted on a previous page cause this issue?

Also, I am unable to ...

A few more hours on this tonight... I think I have reached the end of what I can achieve myself now. I know this much so far:
- Steps are still there in the pulse output. I can only reproduce on the MDI with smoothing on. Cant reproduce in the PID test program.

- Smoothing on makes dead start ...

Change P223 from 800 to 400, and see if that makes a difference in the "flat spot" behavior.

Also check again to make sure your control PC is not running any extraneous Windows software or tasks that might be competing for the CPU's attention.


Pretty sure the PC is up to the job. It is ...

If a person with time, resources and knowledge had a segment of G code that consistently showed the problem, then they could use the CNC12/MPU "debug dump" feature to capture a short interval (maybe one second?) of the low-level data, to see what the outgoing pulse stream looks like. That could ...

Little test programs seem to be ok, but bigger programs that are harder to show don't.

Are you saying that if you select and copy just 3-5 seconds of movement out of a big program -- movement that consistently exhibits the problem -- and paste that into a separate file to run as a test program ...

did you reset the drive to factory defaults BEFORE setting the Centroid provided Delta parameters?


The drives were brand new when I put the parameters in. I also checked them again the other day against the application note. The drive parameter file is attached in a previous post.

The ...

Turns per rev, steps per rev, and acceleration values are loaded from your reports. I set up the drive to use 30,000 steps per rev. That plot is from an MDI move: G1 X50 F1500. The main differences are that I have a single axis, different drive/motor (2kW 2k RPM), and different tuning as well ...

Here's the plots Keith was referring to above.


Not sure what the steps per revolution are on that machine so hard to compare. The acceleration period is over 200ms, so pretty gentle.

My drives look exactly like that if I do a step with the acceleration slowed right down.

I have had to take ...

did you reset the drive to factory defaults BEFORE setting the Centroid provided Delta parameters?


The drives were brand new when I put the parameters in. I also checked them again the other day against the application note. The drive parameter file is attached in a previous post.

The drives ...

these are known good drives that are compatible with Centroid Hardware and software.
we can not reproduce this error on our deltas in our shop. i'll have the guys post our plots.
your issue looks like the drive is not programmed/tuned (delta tune and centroid delay tune) correctly.


I am not ...