Embarassing to say but the correct format I have forgotten,
I have let my cam do It for me now for so long I have let It slip from my memory. I understand the purpose, as it allows you to correct the feedrate for multi-axis movement. The feed value is the inverse of the time it will take for both axis(s) to arrive at the same point(programmed point). I have a good text file write up on inverse time, expaining It's function and purpose, also how to correctly calculate the actual feed rate (for chip load per tooth). I'll try to find it and post it here. Now I too am on a mission to re-learn the correct format. I believe you can test it's function with a single axis movement as well.
If you program in MDI
(START AT X0. Y0.)
G01 X1. F1.
this will take 1 minute to travel 1 inch
To verify the feed in inverse time you can,
(START AT X0. Y0.)
G01 G93 X1. F1.
I believe this will take 10 minutes, as the value is in time,
whether it is minutes or seconds I can't remember. Try F60. to see if it is seconds, Or F10. to see if it is in tenths of a minute.
I'll just try to find that paper, as it is all explained verry well.  |