Hi. Hoping you guys can help me. What is the calculated steps/mm for a 1040mm ACME lead Screw? And just to let you know I don't have a computer hooked to my CNC machine. I am using Interface. But I can hook up black box to my computer and change GRBL settings. I checked my Y axis travel distance and it's off. Sent 28" =711.2mm actual distance traveled 28.25 = 717.55mm. Off by 25.4mm. In black box it's set to $101 = 199.100mm So what's the math for setting this correct? I watched the videos and I'm still confused. is it 197.308?
If its our Leadscrews, 199.1 steps per mm (Theoretical 200, but in practice the rolling process is a little off and its closer to 199.1) 8mm pitch per rotation, 1/8th microstepping of the BlackBox * 200 physical steps of the motor = 1600 microsteps per rotation. 8mm per rotation at 1600 steps per rotation = 1600/8 = 200 steps per mm Rather than bothering to do the Math, just use the Wizard Use as long a distance as possible (the default 100mm is just a safe-ish suggestion to avoid crashes, longer distances = more accurate)
That worked. It's only off now by 1mm Thanks man you are super helpful. I remember now, you explained this to me like a year ago but I forgot.
there is also a Resource for this, which explains all the math HOWTO Calibrate your CNC Machine for MACH3 or GRBL
