I’m fitting a drag knife to my laser cutter - removing the laser head and putting a knife there instead, actuated with a solenoid for the Z.
It kind of works already with no changes from how I use lightburn for the laser, since I set lightburn to 100% power in line mode - that causes the PWM to be 100% duty cycle, which means the solenoid keeps the knife down.
However, I wonder if I can get slightly better results by configuring either GRBL (on the Ortur board), or configuring lightburn - if the X and Y are held steady for just a moment while the Z (AKA PWM) changes. In other words, when PWM changes, I want no other movement for a few milliseconds.
I tried setting $32 to off (e.g., laser mode off), but then the solenoid stays down all the time even during Moves. I didn’t figure out why yet.
I’d expect there’s something I can do related to “spindle spin up time” but my search-foo across the web didn’t figure it out yet.
Any tips for me for my hack?