Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: ShoeSam on May 06, 2011, 06:20:47 PM
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OK...I am new here......and usually work with Big Machines......but my question is related to the Hobby Machine I am playing with.....( TownLabs TL518)
I have a great CAD program for doing complex Surfaces....( Rhino )
I have a great CAM system for doing toolpath generation...( Madcam plugin for RHINO)
Simulation in MADCAM tells me I have a 50 min cycle time for Z level roughing.....( GREAT!)
Code output from Post processor is ok ( lots of X movements {with no other AXIS changes} written as a bunch of small steps....uuugh)
ACTUAL RUN TIME ( even using G00 command lines)........over 8 hrs.......
BOTTOM LINE.....THE THING IS JUST BARELY MOVING!!!!
What is creating this problem???
My Guess.....
the small steps do not allow the ACCEL/DECEL curve of the drives to be over written in the smoothing algorithm....hence even though my feedrate is set to 2000mm/min, actual traverse is more like 100mm/min...
How do I overcome this??
Play with motor tuning?
Any help appreciated!
Sam
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Make sure you're in CV mode (G64).
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G64 has no effect.
Does anyone have some ideas on how to make this thing hum?......
Please Help!
ShoeSam
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Code output from Post processor is ok ( lots of X movements {with no other AXIS changes} written as a bunch of small steps....uuugh)
If your CAM is doing that then I would complain to the CAM vendor, no point in having lots of small X only moves when a single line would do.
Setting a larger lookahead may help but if the code is crap the results will be likewise.
Hood
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What are your accel and velocity settings in motor tuning?
Any chance the FRO is set very low?
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I think it will also depend on how vectors are draw.
In Vcarve, if I do not join vector, gcode output is also made of a series of small line of code with a z move between each each.
This is something you could look at too.
Jeff