spindle speed not working

yes good thinking , also is their any info on adjusting the scale etc , as i notice the speed disply doc's are different to the newly produced code by pncconf
i.e which is the scale factor and fixing the pwm top freq for example

What scaling are you referring too? There is:
encoder scaling - set on spindle page
rps to rpm scaling - a constant number (60)
spindle up to speed scaling. set on spindle page if wanted and using an encoder.
currently the only way to limit the PWM is to use pid and set a limit on that.( see PID maxoutput )
Not that I have tried this at all!
The reason that Spindle control is so limited is because the trajectory planner in EMC does not control the spindle.
So there is no acceleration limit or max speed limit. PNCconf lied to you in earlier versions. You could enter the info but it did nothing.
If using a stepper motor for the spindle then pncconf uses the stepper planner to control acceleration and max speed.
The big plan is to make a COMP component that does the acceleration and velocity limiting and supports gear changes.
Andy has such a component floating around but it has not been added to EMC and I'm not sure it is exactly what I want....
So in the mean time if you want it , you gotta add it to the custom HAL file your self.

Was that too much of a story?

On a side note i want to thank you cncbasher for all your reports back about pncconf.
It really really helps !

Chris M

no problem Chris , just dont like buggn you too much haha ..
i'll look further into the spindle stuff later , once i get this machine sorted and working

at the moment all i need realy is to match the speed readout to the actual rpm of the spindle , or close as
this particular machine has a toshiba VFD i'm feeding it from a 7I43 via pwm and a home made pwm to voltage interface

i'll mention to Andy if he has the comp available

any testing you need Chris just shout , i'm happy to help anytime

Thanks Andy