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That makes sense. Thanks. I always use the "Autovolts" option and has always been good enough but in this case there are complications that I have to catch so the manual calibration is required.

I currently have it on my test bench with a DC power supply set at 24v. Depending on what is doing it typically is drawing around 0.25A. if i turn the current knobs on the power supply it doesnt increase at all.

I have the switch on the driver set to D which according to the data sheet is 2.8 peak or 2 RMS which is alot more than its pulling. Should i switch this to 0-4 according to the datasheet thats about where my current draw is.


I just tried plugging 625 into the arduino code (its not on the machine yet) and its about 1.125 spins.

this is the process I followed to set up a hyperterm 85 SYNC
1 Make sure the Z axis is properly calibrated including trabvel switch if any.
2 Make sure table is properly laveled, so the plate to cut is always perpendicular to the torch
2 From hyperterm Cut tables select a metal plate in the midle range of the plasma power supply and set up the parameters in the proper tool.
3 Disable any THC feature including THC itself.
5 Cut a line of a length that allow you to record the voltage on the screen (May be 8 or 10 inches long), using the previusly ste tool.
6 Adjust the voltage scale to reflect the voltage in the cut table for that cut heigh.
You can repeat with a thicknes on the high range and then one in the low range and then make an average.
this method has worked to me don't need to many maths but for sure should be anothers that work.

Also... Here is the LinuxCNC post processor from Inventor.

Hi Friends, 


- yes its a hybrid stepper, sorry for the misnomer, i've attached the data sheet of the motor and the drive.

I am using a GT2 timing belt and timing pulleys i got off amazon. The pulley ratio expressed as a fraction is 37.49/11.99. I just realized i should probably use the number of teeth instead which brings that fraction to 60/20 or 3, but this still doesnt get me to the 540 number any easier. How would one measure the pulley ratio with the actual belt? 

I was hoping that the belt system i designed wouldn't slip THAT much. I only have it rotating one way, as belts are good pullers not so good when it comes to pushing. I mean i even have a custom tensioner in there. I can upload cad photos if necessary.

So because i took the head off to redesign it i haven't put it back up on the machine and reset up the drive, all the numbers i am sharing are coming from the little Arduino script i wrote to test this.