I was experimenting with a 1/4 inch bit today to figure out what feeds and speeds would work best with the combination of that cutter, my machine, and walnut. I attempted to cut a series of slots at different RPM and feed rates of 120, 1600, 2000 mm/minute, but all the feed rates looked the same to my uncalibrated eyeball. Then I found these lines in the openbuilds control grbl settings, which probably explain why all my 1000+ rates looked the same. $110 X-axis maximum rate, mm/min 1000.000 mm/min $111 Y-axis maximum rate, mm/min 1000.000 mm/min $112 Z-axis maximum rate, mm/min 1000.000 mm/min Are there any hardware limits I should be concerned with higher feed rates before I start changing limits? Machine is a stock C-beam machine with black box controller run with Openbuilds control and a router11. Incidentally, the result of my experiment with a Spetools 1/4" 2 flute upcut flat endmill cutting a 3mm deep slot (full width cut) at 1000mm/min feed was a clean groove at 22k and 18k, a lot of noise but clean groove at 14k, noise and a wiggly groove at 10k rpm. There may be a little room to increase the feed rate over 1000mm/min if i keep the rpm up.
Tweak away if you set it too high, it will just stall, then dial it back 10-20% below stall point Have a read through github.com/gnea/grbl/wiki/Grbl-v1.1-Configuration first
Thanks. And thanks for pointing me toward that wiki. Lots of good info there that should help me understand other setup parameters..
