Stepper noise with mesa on new install

Hi All,
I have a system which I have repurposed to driver a Sherline Mill. Using their steppers but TB6600 drivers. 
I'm getting noise during steps. I thought it was the handle rattling but it occurs on all axis. I taped the handle to be sure.
If I run G0 X4, G0 X0 repeatedly, it doesn't appear to loose steps with one exception. The first move after Home runs
about 1 inch past where it should. After that, perfect. 

Sherline steppers
TB7600 drivers, 3200 steps / rev, 2 amp currently limit
Servo thread max jitter 152807
Base thread ma jitter 214347 (not great but I didn't have a problem before)

I tried editing the INI file to increase step pulse beyond the 10,000 that pncconf allows but it didn't make a difference. I did set it down to 4000 to see if I was editing the right place and the stepper no longer moved.

Any clues? 
     

I would check:
hm2_7i76e.0.stepgen.00.position-fb (for the X axis)

with halmeter or halshow to see if the
noise is from the drives or LinuxCNC

Hey Peter. It's been a while.

Perhaps this is 2 problems.

Start LinuxCNC
Home all
Open halmeter and select hm2_7i76e.0.stepgen.00.position-fb
reads 0
G0 X4
reads 4.979041
G0 X0
reads 0.979041
G0 X4
reads 4.979041

The first time after a home, I get a move too far. After that, all is good.
Actual machine tracks these numbers, well as close as I can measure!

Hi Tommy,
Measured 12.14v. It's a 10 amp supply.
The Sherline steppers are indeed 6 wire. They didn't use the center tap and treated them as bipolar.

My experience before was a continual tone while the stepper was running at the same rate. This seem to have a crunching sound occasionally. I have not disconnected the motors but all axis produce this sound. Hmm, I didn't check to see if they produce the sound at the same time.

Thanks,
Steve

Hmm, I just re-read the spec. Maybe 24 would have been a better choice. Easy test. I have a programable power supply.
www.sherline.com/wp-content/uploads/2018/12/steps_spec.pdf

If you get random "thumps" on all moving axis, that is possibly a latency issue.
One thing that may help is to set the DPLL sample time earlier, that is, change:

setp hm2_7i76e.0.dpll.01.timer-us -50

to

setp hm2_7i76e.0.dpll.01.timer-us -200
 

I saw that on another thread. Can you remind me where to set that? I assume it's the mesa tool but I don't recall its name.

Its in your hal file