Hi, I am having problems getting machine to travel at low feed rates for the x and y axis. I can't get the machine to travel at less than 70 mm/min. Setting the feed rate above 70 mm/min, the machine travels at the correct speed, setting the feed rate below 70 has no effect, it travels at 70 irrespective of the set feed rate. I watch the gcode lines as they are processed through UGS and the set feed rate is correct displayed. i use Cut 2D Desktop 9.0 to generate the .gcode file and have used both UGS version 1.0.9 and the nightly build 2.0 to control the machine. Anyone got any ideas? thanks Andrew
GRBL has a minimum speed limit that cannot be changed. 0.9i - Min feedrate appears to be around 40-45mm/min · Issue #742 · grbl/grbl
it is not a bug, it is a limit in the math. as the thread explains, you can turn off the adaptive algorithm if you really need lower speeds but at the cost of efficient path planning. what are you cutting that needs such low feed speeds? on my OX I have not cut at any less than 750mm/min with just a Dremel as the spindle (balsa, plywood, plastics) so I don't quite get what you need such low speed for. these light machines with high spindle speeds all function very well at 'high' feed rates with shallow depth of cut.
