First Build 5 x 12 Steel Frame CNC router

[Scott Damman]

Yeah I figured the cart was ahead of the horse so to speak but it was fun to get something moving. I was planning on just doing a quick tune so that I could jogg the axis... 3 hrs later I was so frustrated I had to say stop.

I dont know that the motor is tuned correctly, these are the units from BST and I just made sure to set the drive to the correct number for the motor. I will need to do a little more learning on servo drive tuning before jumping into that can of worms... Should I need to dig into the servo driver setup? I was hopeful that just setting the number for the motor would get me where I needed to be.

The acceleration was set just trying to push the limits of the servos a bit, I ran all the way down to 50 inch/s/s and it is always 0.003 inch off the mark with the PID set the way I have it. Then if I changed the PID, the overshoot and hunting was always essentially the same, so with that I came to the conclusion that the acceleration may not be in play? But obviously more tuning needs to be done.

I do need to play more with the KD and Kvff, but I think I will take your advice and wait until the whole thing is together before performing the final tuning.

Have a Mach4 question as well, DRO readout with the CSMIO-IP/a, in Mach3 if I would turn a servo motor by hand the DRO would update. In Mach4 I am not getting that, hoping that its just a setting somewhere that I overlooked? Anyone have any thoughts? I was using the demo of Mach3 and decided to buy Mach4 so I dont need/want to upgrade as quickly.

So onto finishing the mechanicals. Thanks for the help

Here is the Z axis jogging, I didnt do much of any tuning here just got it running making it easier to work on.