How to check whether G33 would hit machine limits?

G-code program that uses a series of G33 lines to move the tool in sync with a lathe-spindle. Currently it seems I can execute programs that would need the machine to go faster than configured in the MAX_VELOCITY and MAX_ACCELERATION in the ini-file.

At the moment the program is executed (using AXIS in this case) and the machine just "silently" loses the synchronization with the spindle without so much as a notice. Is there a way to check whether a program would work (at a given spindle-speed) before-hand?

I would actually expect the machine to trigger a following error. Are your f-error limits unusually wide?

Not that that is any real help, of course.

Yes the F_ERROR settings might be a bit 'generous'. So that covers the 'silently' part. I'd still love to know as early as possible that the program will fail (ie. before executing it) and also exactly which part of it is too fast.

If needed I'm even prepared to chip-in some coding - but at the moment I do not even know where to look for that functionality.

It could be done in G-code.....

Reading of INI files by G-code needs to be enabled for this to work:
linuxcnc.org/docs/2.7/html/remap/remap.h...i_file_configuration

Wow, thanks! Do you also know something similar for the acceleration? I guess that somewhat depends on trajectory planning, right?

From that I know the difference in speed as , but I still don't know the needed acceleration.

torotil wrote: Do you also know something similar for the acceleration

The fact that the spindle is (probably) already turning and that the axis has a finite acceleration means that there will always be _some_ error. The magnitude of the position error can be calculated from the desired speed (rpm x feed) and the equation v^2 = 2as.
In this case a can be read from the INI and s is the resultant following error.