Hi all. The feed rate slider does not seem to do anything. I have the newest version of control. Using the software to drive a pick and place robot, we are running the gcode at full speed and limit the speed only by the set max speed but once in a while we would like to dail it down to test a new pickup point. Am i doing something wrong, is there a box i have not ticked?
Checkout the Grbl Wiki: gnea/grbl (a little down from there) for description of what the feature does It's a feature I personally use almost daily and it does work (in CONTROL) Keep in mind its a percentage override of set F speed (but still honoring all other Grbl minimums and maximums too) not a "set maximum speed" As such if you havent tuned your acceleration for example, if a move never gets up to speed (short Z move, probably the case) override wont even get involved if the acceleration limits it first
Hi Peter. Thank you. The Z axsis is actually 1 meter long and it reaches the set speed in about 10 cm. The machine is 1,2 meter by 1,2 meters by 1 meter. Maybe the problem is that we do not set an F speed in the Gcode? We run it on maximum.
Sorry had to make assumtions (; didnt mention lengths, assumed PnP as in PCB assembly. Possibly... As it takes the F value and scales it. However, Grbl will not run with having F somewhere in your Gcode? It's modal so has to be specified at least once: If not your first G2/3/4 line will popup a "error: 22 - Feed rate has not yet been set or is undefined." Or are you breaking standard and just using G0 moves (which the feedrate slider does not apply to, G0 = rapid moves, not feed moves)
No problem, we are using this system to build many strange contraptions Yes we are breaking standard and just uses G0, but the feed rate should also affect rapid moves or am i wrong?
You are indeed wrong Refer to the wiki linked above. Rapid Overrides is a whole different function In standard CNC applications, Rapid moves (G0, G28, G30 etc) run at maximum, tuned just once Feedrate (G1/2/3 moves etc) needs more flexibility: override is always on hand as material density may differ in some spots, or tool may start to dull, etc requiring on the fly adjustments Therefore, see the wiki, but Rapid Override is just 25%, 50% or 100% as its not really something needing fine tuning. So replace those G0's with G1s and "stick to standards" they exist for a reason!!!
Roger that ! Thank you very much for clearing that up. We will change the gcode to a more standard layout
