Search found 4 matches

by Wilafau
Mon May 21, 2012 3:10 am
Forum: Electronics
Topic: grblshield and Z axis
Replies: 31
Views: 9779

Re: grblshield and Z axis

Alden, excellent post! I think it should go in the wiki. Would have saved me some of the trial and error I did to figure out what is going on. But of course that process was educational too. I too had the binding delrin block problem which I solved by reaming the mounting plate holes just slightly s...
by Wilafau
Sun May 13, 2012 4:18 am
Forum: Electronics
Topic: grblshield and Z axis
Replies: 31
Views: 9779

Re: grblshield and Z axis

I went ahead and did the mod to my grblshield. I found the trace that leads from the Z axis UM1 on the 8811 chip, cut it and grounded UM1. This enables 2X microstepping on the Z axis. I changed $2=640 steps/mm (full step is 320 steps/mm so 2X is 640). Works like a champ! I was able to get the hello ...
by Wilafau
Sun May 13, 2012 12:54 am
Forum: Electronics
Topic: grblshield and Z axis
Replies: 31
Views: 9779

Re: grblshield and Z axis

@Enraged - Thanks - good to know I am not crazy!. How did you modify your grblshield? I am handy with a soldering iron & exacto knife so I am prepared to cut & greenwire. Did you cut the trace between Z axis UM1 & R2,R4 and then solder a jumper or resistor from UM1 on the driver chip to ground? Sinc...
by Wilafau
Sat May 12, 2012 10:20 pm
Forum: Electronics
Topic: grblshield and Z axis
Replies: 31
Views: 9779

grblshield and Z axis

I got my shapeoko kit in the mail this week (thanks Edward!) and got it all assembled. I am using a grblshield and cant get the Z axis to behave properly. The symptom is that that the Z stepper seems to stall at speed. I took the Z stepper off the shapeoko so it was by itself with nothing but a piec...