These videos are awesome. Here’s the link to his channel :
The last three videos :
36 - X-Carve Stepper Calibration
35 - Adjusting X-Carve Potentiometers
34 - Setting X-Carve Belt Tension
Thank you @RobertA_Rieke and very nice work.
Here’s my unit. 
I’m losing steps in the y-axis also, about 10mm and only losing steps on the last pass
I’m cutting on .58" birch plywood.
Y-axis lost steps on last pass when settings were 60ipm feedrate, .08" depth per pass (12min to complete), and feedrate 45ipm, .07" depth per pass (9min to complete).
Actually when running the first time on recommended setting, there was no slippage but this same piece took 42min to complete… and that’s just way to slow to accept as defacto for wood haha
I"ll try cutting again at default settings to see if will slip or not slip on y-axis this time
I have the same happened yesterday when I adjust the current in the controler and filped the fan in wronge way , and start working after awhile, I saw many loosing steps, I stop the work and check for any hardware problem but nothing all things is good.
thanks Richard for this notes,today I will fix the problem by filp the fan and see what happen.
The X Axis running correctly but the Y having problems makes me think that driving two motors from one channel is not a good thing to do. I had been using the g-Shield on a mill and lathe before getting into X-Carve and those systems only have one motor on each axis. I’ve never had a problem of losing steps with them. I bought a 1000mm X-Carve framework and didn’t actually put it together as it came from the factory. Instead I designed and milled two new gantry end plates with some other mods to drive the Y axis with a single stepper motor (left side only). As a result of the mod, my clearance is 60mm higher and the two sides of the gantry stay square because of the shaft that mechanically locks the two sides together. So I can push one side of the gantry and the other follows instead of the mooshy gooshy behavior of the stock X-Carve. One might think that the Y axis might need more power than the X because it carries more but I think that my Y axis actually moves more easily and smoothly than the X. Having the same motors (and the same number of motors) on each of the three axes greatly simplifies tuning of the drive current. I wonder why Inventables didn’t design their system like mine in the first place.
