I finally got a little time to work on my CNC machine. I'm trying to get the Grbl configuration settings entered, and I'm struggling. I found a site on the internet ( http://noblesque.org.uk/ShapeOko/grblcalc/ ) and was trying to work through the calculations. At this point, I have removed all step jumpers on my CNC Xpro controller board. Here is some specific information about my machine: It's modeled after the Open Builds OX design with an overhead gantry. I'll be running a Dewalt DWP 611 1/4" router. X and Y axis belt / pulleys: GT3 20 tooth 18.3 mm diameter Z axis: 8 mm Acme rod: 1.25 mm / revolution Nema 23 stepper motors on X, Y and Z axis (2 on Y axis) I do not have limit switches or homing switches installed yet. (Approx. working bit area is X=560mm, Y=380mm, Z=70mm) Here are my current Grbl config settings: $0=10 $1=255 $2=0 $3=6 $4=0 $5=0 $6=0 $10=3 $11=0.020 $12=0.002 $13=0 $14=1 $20=0 $21=0 $22=0 $23=1 $24=25.000 $25=500 $26=250 $27=1.000 $100=3.333 $101=3.333 $102=160 $110=635.000 $111=635.000 $112=635.000 $120=100 $121=100 $122=100 $130=560 $131=380 $132=70 Obviously, I don't know exactly what to do. I can get the x axis to move, but not sure about the scale or accuracy yet. It seems to move slow and almost choppy. I suspect my settings are incorrect. No luck with Y axis. Can anyone give me a little assistance? Thanks! Don
Hey bismark, Travel per revolution is going to be the pitch diameter (not the pulley diameter) × pi. Ex. a 19.000mm pitch Dia. >> 19.000mm x pi = 59.690mm per rev. So. a stepper with 200 steps per rev. 59.690mm/200=.298mm per step. Running the same stepper in half step will yield a resolution of .298mm/2= .149mm per half step. and so on for 1/4 and 1/8 step settings. The z is easy. 1.25mm/200 or 400 or 800 and so on. While I don't have time atm, I'm sure someone will stop by to help you with all of the grbl settings. If not I will later. There are some grbl posts with setting here on the forum and the grbl wiki is handy as well. Joe Edit. There may be a number floating around that tells what to add to the pulley tooth pitch diameter to figure out the belt pitch diameter as a shortcut, but I don't have that. plus there are different manufacturers for these belts. Gates is the main source of this design I'd read through their material first. http://industrialbeltdrives.com/wp-content/uploads/2012/05/20099_POWERGRIP_DDMANUAL_ENGISH.pdf
