![]() ![]() I’m traveling at the moment but I’ve got a link to the circuit in one of my other posts. PWM logic inverter circuit (transistor, led and 2 resistors) to compensate for the power supply firing the laser at full power when the PWM signal is 0 volts. Machine still homes to the back left, but it sets the right y max. There’s a gcode command for this but I used the “set zero” button in universal gcode sender. ![]() jog machine to front left corner and set as machine zero point. I’m still playing with acceleration and max speed, currently at 30 respectively. $100/101, mine needed 158 steps per mm on X and Y. $27=3mm to move off the switches after homing. $21 (I think) to enable hard limits, required for homing to work. I flipped the stepper connectors at the CNC shield to get proper direction rather than compensate with the $ command $1=255 to keep stepper always energized. Adding capacitors might have done the job, and I may try that later. changed my K40’s mechanical NC switches to NO to get homing to work reliably. The lines are there and you just comment out the original setting and uncomment the ones you want. Edited the grbl config file for 2-axis homing (default homes Z first which doesn’t exist on the K40) and re-flashed the firmware. You may do signal ground too but on mine with the relay board the ground works different to maintain opto isolation. Connect 5v from power supply to shield/uno. Connect 24 v from power supply to cnc shield screw terminals. I’ve also got a relay board for fan and air assist, but that’s not grbl-specific either. added main cutting area door interlock switch in series with laser enable switch (not specific to grbl but basic safety). ![]() ![]() Here’s the high-level list of changes it took: ![]()
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