My stepper motor is homing at an incredibly slow rate, so slow that I can barely detect any movement. What could be the issue? Here is my GRBL configuration: >>> $$ $0 = 28 (Step pulse time, microseconds) $1 = 25 (Step idle delay, milliseconds) $2 = 0 (Step pulse invert, mask) $3 = 1 (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 = 0.002 (Arc tolerance, millimeters) $13 = 0 (Report in inches, boolean) $20 = 0 (Soft limits enable, boolean) $21 = 1 (Hard limits enable, boolean) $22 = 1 (Homing cycle enable, boolean) $23 = 1 (Homing direction invert, mask) $24 = 100.000 (Homing locate feed rate, mm/min) $25 = 500.000 (Homing search seek rate, mm/min) $26 = 250 (Homing switch debounce delay, milliseconds) $27 = 1.000 (Homing switch pull-off distance, millimeters) $30 = 1000 (Maximum spindle speed, RPM) $31 = 0 (Minimum spindle speed, RPM) $32 = 0 (Laser-mode enable, boolean) $100 = 250.000 (X-axis travel resolution, step/mm) $101 = 250.000 (Y-axis travel resolution, step/mm) $102 = 250.000 (Z-axis travel resolution, step/mm) $110 = 500.000 (X-axis maximum rate, mm/min) $111 = 500.000 (Y-axis maximum rate, mm/min) $112 = 500.000 (Z-axis maximum rate, mm/min) $120 = 10.000 (X-axis acceleration, mm/sec^2) $121 = 10.000 (Y-axis acceleration, mm/sec^2) $122 = 10.000 (Z-axis acceleration, mm/sec^2) $130 = 200.000 (X-axis maximum travel, millimeters) $131 = 200.000 (Y-axis maximum travel, millimeters) $132 = 200.000 (Z-axis maximum travel, millimeters) ok
Your maximum rates ($110, 111, 112) and your homing rates ($24, 25) are all rather low. $110 - 112 you should be able to increase to about 2500 (they are currently 500) and you should also be able to increase your homing search and locate rates. Try $25=1000 & $24=500. Alex.
I'm still kinda struggling with this issue. The stepper moves perfectly fine with commands such as G1 X100 F400. However, it doesn't move at all while homing and just holds torque. Note that my application requires only a single axis, so ignore the Y and Z axes configurations. I would appreciate your help! Here is the most recent GRBL config: $$ $0 = 10 (Step pulse time, microseconds) $1 = 25 (Step idle delay, milliseconds) $2 = 0 (Step pulse invert, mask) $3 = 1 (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 = 0.002 (Arc tolerance, millimeters) $13 = 0 (Report in inches, boolean) $20 = 0 (Soft limits enable, boolean) $21 = 1 (Hard limits enable, boolean) $22 = 1 (Homing cycle enable, boolean) $23 = 1 (Homing direction invert, mask) $24 = 500.000 (Homing locate feed rate, mm/min) $25 = 1000.000 (Homing search seek rate, mm/min) $26 = 250 (Homing switch debounce delay, milliseconds) $27 = 1.000 (Homing switch pull-off distance, millimeters) $30 = 1000 (Maximum spindle speed, RPM) $31 = 0 (Minimum spindle speed, RPM) $32 = 0 (Laser-mode enable, boolean) $100 = 100.000 (X-axis travel resolution, step/mm) $101 = 250.000 (Y-axis travel resolution, step/mm) $102 = 250.000 (Z-axis travel resolution, step/mm) $110 = 2500.000 (X-axis maximum rate, mm/min) $111 = 500.000 (Y-axis maximum rate, mm/min) $112 = 500.000 (Z-axis maximum rate, mm/min) $120 = 80.000 (X-axis acceleration, mm/sec^2) $121 = 10.000 (Y-axis acceleration, mm/sec^2) $122 = 10.000 (Z-axis acceleration, mm/sec^2) $130 = 200.000 (X-axis maximum travel, millimeters) $131 = 200.000 (Y-axis maximum travel, millimeters) $132 = 200.000 (Z-axis maximum travel, millimeters) ok
You say ignore the Y and Z, so you are only using the X. The problem you may be having is that the machine is waiting for the Z to home first since Z always goes first. If Z never homes, then X and Y can't start. However, there is a 2 Axis version of firmware you can flash that removes the Z axis.
And did you recompile Grbl to disable Z and Y homing? The precompiled image for 2 axes would still error out waiting on the 2nd
That was it! I connected the stepper to Z-axis, and the homing started well. However, as expected, homing didn't finish because grbl is trying to also home the other two axes. Is there any easy fix for this issue? Something I could edit in the grbl library?
