Delta specific acceleration and jerk sane tuning?

Acid

Hi!

This past week I've been tuning my newly finished Delta printer. Most of it is working correctly now, but I am looking into tuning feeds and speeds to allow the machine to operate a little faster.

My aim is to stay within the max speeds that allow me to stay in Stealthchop mode (extruder Orbiter v2 in bowden modus runs on spreadcycle), however, my extruder can't keep up with the max speed, so this is the deciding factor.

For non-printing moves I am able to reach 120mm/s without the drivers switching over to spreadcycle.

These are my current values:

M566 X1200 Y1200 Z1200 E700 	       		   ; set maximum instantaneous speed changes (mm/min)
M203 X7200 Y7200 Z7200 E6000        		   ; set maximum speeds (mm/min)
M201 X4500 Y4500 Z4500 E4500         		   ; set accelerations (mm/s^2)

I intentionally limited the maximum speeds at 7200mm/min which translates to 120mm/s to make sure the machine doesn't hit the threshold.

The thing is that most topics I could find were about tuning these values for bedslingers, and since a Delta spec has a lot lower moving mass, I'm assuming that jerk and acceleration could be tuned a lot higher. I find it hard to get a 'feel' for how I can tune jerk.

What are good (sane) values to start from? And are there recommended guides that can help me progress from there to further tune it?

Phaedrux

Those look like sane starting values.

You can live tune the values by sending the commands during a print. To make that a bit easier there's a pack of tuning macros here: https://forum.duet3d.com/topic/6181/tuning-macros-menus-accel-jerk-retraction-pressure-advance?_=1678993843407

Acid

@Phaedrux said in Delta specific acceleration and jerk sane tuning?:

Those look like sane starting values.

You can live tune the values by sending the commands during a print. To make that a bit easier there's a pack of tuning macros here: https://forum.duet3d.com/topic/6181/tuning-macros-menus-accel-jerk-retraction-pressure-advance?_=1678993843407

Yes, that looks just like what the doctor ordered. I'm almost home and will start working on it immediately.

I'm pretty sure my machine can go a lot higher. Your tuning macros will be used as an inspiration but I'll probably customize them a bit.

Thanks for sharing!