Ok - If all else fails RTFM!
Your both absolutely right. The formula you gave is on the manual. (1 piece of paper.)
I have now accurately set the Ampage fairly accurately to 3Amps on all pots. (Which seems to equal 1.36 V) across the two terminals.
e.g. (1.36 * 0.333) / 0.151 = 2.999A
As I think i mentioned my programs have been crashing 1/2 way through. I initially thought this was interference, but tonight i have successfully run
programs in mid air with the cutter running, and then cutting mdf on a very slow feedrate.
I suspect the crashes occur when the motors are under more load. E.g. When the feedrate or cut depth is higher.
I did have a feedrate of 1500, and now i have dropped it to 1000.
Looking at the manual, the drivers say they have TSD (Thermal shutdown), Over Current Detection (ISD) and built in Under Voltage Detection (UVLO).
I suspect that one of these is kicking in at higher feed rates. I expect Over Current Detection - the boards are not getting hot.
Do you think a higher voltage power supply would solve this ?
What would you recommend in terms of volts required - Just reread your post.
Where the hell am i going to get a 36V 12A power supply from?
Thanks for your very useful help...
Martin