so, here is my situation.. running a 3-axis gantry (with X & A axis slaved for the gantry) router... I have rapids set at 6_ _ IPM on my Y-axis, and about 300 in my Z-axis.
I am cutting a convex contour in the Y-Z axis, and then an 1/8 stepover in the X... in foam (think blue house insulation panels).. many many many short little segments blended together...
I am using an AD DL06 PLC with an analog card to control my feed/speed over-rides.
If I set my feedrates at 500 IPM in the GCode file, I end up with some rather nasty, jerky motion... Ok.. so turn the feedrates down cause we're obviously pushing the envelope for the speeds the machine can be happy at.... So, I turn my feedrate down to 200 IPM using the feedrate over-ride... motion is still jerky... hmmm
I go in my GCode file, and set my feedrate at 200 IPM... this time when running, the machine has got really smooth motion... even @ 100% feedrate override.. i turn it down to 100 IPM using the feedrate over-ride, and motion is still smooth (which would make sense.. if it's smooth @ 200, it's probly gonna be smooth @ 100)...
So, My question is this.. why is the machine behaving any differently when i set my feed @ 200 Vs 500?? the end result is still 200 IPM when the feedrate override is put in.... It's not really a HUGE issue, as i can take care of it by changing my hardcoded feeds.. i'm just curious as to why it's doing this...
any input would be great!
BTW.. eagerly anticipating Quantum on this machine.. it would be the bomb diggity for what we're doing
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