Ian W. Wright wrote: > 'Scuse me for stepping in but I'm a bit confused by a couple of things > being said in this thread..... > 1. Exactly why does a low accel round corners more than a fast accel.? > Does this suggest that a machine with slightly underpowered drive motors > is inherently less precise than one with big drive motors?
If specifying G64 only (no tolerance) then emc will blend segments into eachother as best it can. With slow accels this results in more rounded corners. With G61 or G61.1 the machine should still follow the programmed path. I'd recommend always using G64 with a tolerance (i.e. G64P0.01 or similar) because the behaviour with only G64 depends on the vel/accel settings in your INI file. > 2. Is there some advantage in using G64 with a tolerance over G61 if you > want tight adherance to a toolpath? if your part geometry is simple then G61 might be fine. G64 is usually used with CAM-generated tool paths which could be 100s or 1000s of short G1 segments in almost the same direction. With G64 and a tolerance emc blends the moves to achieve a smoother feedrate. Anders ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
