LinuxCNC S-Curve Accelerations

I changing the feed F command in G-code.
I also noticed that different tracks are driven for the F1000 and F5000.
For F1000, down to -10.80618622925091 mm.
For F5000, down to -10.77390521216340 mm.
Attached are the two scope files..

Gruß
Rüdiger
 

Hello,

I think I’ve found the reason for the reduced speed at F1000.
It’s the "MAX_FEED_OVERRIDE" setting in the .ini file.
When MAX_FEED_OVERRIDE is set to a value greater than 2.0, the speed is the same as it is for F5000.
Is this behavior intentional?


Gruß
Rüdiger

 

It's not really intended but is a known limitation of the planners, original linuxcnc planner as well.

This is part of the reason why I shifted focus on rebuilding the tp base. Which I am ready to share the first draft of, mind that it is still very much work in progress, although quite promising so far on my own testing.

github.com/grandixximo/linuxcnc/tree/tpnext-ma

set in your ini in addition to the jerk limits.

[TRAJ]
TPMOD = tpnextmod
PLANNER_TYPE = 1

This is the different approach which I mentioned in my previous post, based on my multi-axis branch, plus a new base for the tp, path based rather than segment based.

Thank you all for the continued testing and support, I do keep an eye here even if I don't always reply