Hi Guys, I've got a BlackBox controller with VPD setup which is mostly running find with variable speed control via G-Code. I followed the various videos and posts online (e.g. ). My issues is the "M3 S10000" command is be executed with a actual spindle RPM of 10x slow, is. 1000rpm. I've worked around this to date, adding a zero but it's getting annoying as I'm trying to calc surface speeds correctly in Fusion. I noted from the videos online that others don't have this issue, so presume there is a fix somewhere other than hacking at the post process Fusion 360 script. Thanks, Damien
Probably VFD parameters. They are quite hard to setup but refer to your VFD manual or the supplier of the VFD may have advice. Just double check your Grbl settings: $30 Max RPM isnt accidentally set to 10x more than the actual max rpm of the setup
Nb if you set $31 to something other than zero, it can affect your scaling unless the equivalent minumum rpm setup is done correctly on the VFD.
After some diagnosis and checking of VFD settings, I found the issues. I'm embarassed to say, I'd entered 240000 instead of 24000 in the Blackbox config settings for max RPM. Anyway, hopefully this may help someone else diagnose it quicker that I did. Thanks for the helps, Damien
