Grbl Z Axis Homing Switch Fix 

Glad it helped!

Sure, it's a NEMA 17.

Big Man, Black T-shirt still remember what's its holding torque? I believe nema 17 step motors have variety according to torque thanks

I don't know, but I'm sure that info is available online somewhere. The NEMA 17s came with my machine and I installed them, I didn't check their specs or anything, sorry.

im having the same problem too

notepad++

If you hit a hard limit, you have to soft reset then unlock to be able to jog axis again.

Can you post your Arduino's Grbl settings here so I can see them? $$ does it

$0 = 5 (Step pulse time, microseconds) $1 = 25 (Step idle delay, milliseconds) $2 = 2 (Step pulse invert, mask) $3 = 5 (Step direction invert, mask) $4 = 0 (Invert step enable pin, boolean) $5 = 0 (Invert limit pins, boolean) $6 = 0 (Invert probe pin, boolean) $10 = 1 (Status report options, mask) $11 = 0.010 (Junction deviation, millimeters) $12 = 0.000 (Arc tolerance, millimeters) $13 = 1 (Report in inches, boolean) $20 = 0 (Soft limits enable, boolean) $21 = 1 (Hard limits enable, boolean) $22 = 1 (Homing cycle enable, boolean) $23 = 0 (Homing direction invert, mask) $24 = 25.000 (Homing locate feed rate, mm/min) $25 = 200.000 (Homing search seek rate, mm/min) $26 = 250 (Homing switch debounce delay, milliseconds) $27 = 1.000 (Homing switch pull-off distance, millimeters) $30 = 10000 (Maximum spindle speed, RPM) $31 = 0 (Minimum spindle speed, RPM) $32 = 0 (Laser-mode enable, boolean) $100 = 400.000 (X-axis travel resolution, step/mm) $101 = 400.000 (Y-axis travel resolution, step/mm) $102 = 400.000 (Z-axis travel resolution, step/mm) $110 = 750.000 (X-axis maximum rate, mm/min) $111 = 750.000 (Y-axis maximum rate, mm/min) $112 = 750.000 (Z-axis maximum rate, mm/min) $120 = 35.000 (X-axis acceleration, mm/sec^2) $121 = 35.000 (Y-axis acceleration, mm/sec^2) $122 = 35.000 (Z-axis acceleration, mm/sec^2) $130 = 300.000 (X-axis maximum travel, millimeters) $131 = 300.000 (Y-axis maximum travel, millimeters) $132 = 300.000 (Z-axis maximum travel, millimeters) ok

So you commented out Line 339 on the file config.h to DISable the variable spindle, which should put Arduino Pin D11 back to being for the Z limit switch, correct? When you do that, and then run UGS and enable Verbose Mode, you should be able to trigger your Z limit switch and see it register in the UGS’s Console window.

Also, can you confirm which version of Grbl you have loaded onto the Arduino?

@@bigmanblackt-shirt8506 yes I did comment out the variable spindle as you did and then saved the file. I then recompiled to and sent to Arduino.