To find the maximum feed settings, do the following:

  1. Load our feed_test.jpg (right click for download) into LaserWeb.
  2. Create a raster operation and change pass to 1 and cut rate to 6000 mm/min (= 100mm/s).
  3. Generate the gcode.
  4. Click on COM tab, select the machine port and connect.
  5. Click on JOG tab. On the lower right of the screen you see the console line.
  6. Type $110=30000 into the console line and press shift-enter. This sets the max X feed of GRBL to 30000mm/min.
  7. Type $111=30000 into the console line and press shift-enter. This sets the max Y feed of GRBL to 30000mm/min.
  8. Run the job.
  9. If the feed is too height, you will hear/see lost stepps during X moves. Then lower the feed vale (in step 2.) by 10% and test again.
  10. If there was no lost stepps, increase to value by 10% and test again.
  11. If you found the limit where loosing stepps begins, reduce the value by 15-20% and set it to $110 and $111 (X and Y axis).
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