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Grbl Homing problems

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2023-05-23

Hello,
I recently became interested in Diode Lasers. I’ve used a CO2 for several years along with Lightburn. I’m having trouble with my machine not homing. I have Windows 10 and Lightburn grbl.
I have working limit switches in the lower left corner. I’m using an AnnoyTools Laser board.
I sometimes get the following error message: “Homing fail. Could not find limit switch within search distance. Defined as 1.5 * max_travel on search and 5 * pulloff on locate phases.”
Here are some screenshots of the Machine Settings:

Also, when I check “Auto home on startup” under the Device Settings, the machine hangs up on startup with a green “busy” bar. Thanks, Mark
C

    • Terrelle

      2023-05-24
      I assume the machine starts moving toward the home switches when you start it up or initiate a homing cycle. If not, flip the X and Y Homing direction invert switches as needed.

Assuming the X and Y Max travel values are correct, then the Homing Pulloff is excessive. Reduce it to about 3 mm and verify the switch levers completely relax after homing.

An initial homing seek speed of 3500 mm/min seems far too high for comfort. Reduce that to 600 mm/min; you can increase by factors of 2 after everything works correctly.

Those tweaks should get you closer to the goal …
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