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Mach4 General Discussion / Re: Real G93 Gcode anyone
« on: January 30, 2018, 09:53:31 AM »
Hi Mauri,
I think the difference here is between inverse time mode and constant surface speed.
in my example
G94
G1 X50 Y50 Z50 F86 completes in 1 minute with a cut speed of 1mm/sec
G93
G1 X50 Y50 Z50 F1 completes in 1 minute, same trajectory, same time to completion, therefore same cut speed ie 1mm/sec
This is straight inverse time mode and it works just fine. What you want is a rotary move subsequent to the linear move to have the same cut speed as the linear move:
G93
G1 X50 Y50 Z50 F1 cut speed=1mm/s
G1 A5 F=nnnnn
where nnnn is such that the cut speed is still 1mm/sec
The cut distance = (5/360)*PI*2*radius and radius is Z=50
cut distance =4.363mm
time to complete at a desired cut speed of 1mm/sec is 4.363 sec
Fnnnn= 60/4.363 =13.75
This is a constant cut speed expressed as inverse time mode but requires the radius for the calculation to be made. The two are fundamentally different.
Craig
I think the difference here is between inverse time mode and constant surface speed.
in my example
G94
G1 X50 Y50 Z50 F86 completes in 1 minute with a cut speed of 1mm/sec
G93
G1 X50 Y50 Z50 F1 completes in 1 minute, same trajectory, same time to completion, therefore same cut speed ie 1mm/sec
This is straight inverse time mode and it works just fine. What you want is a rotary move subsequent to the linear move to have the same cut speed as the linear move:
G93
G1 X50 Y50 Z50 F1 cut speed=1mm/s
G1 A5 F=nnnnn
where nnnn is such that the cut speed is still 1mm/sec
The cut distance = (5/360)*PI*2*radius and radius is Z=50
cut distance =4.363mm
time to complete at a desired cut speed of 1mm/sec is 4.363 sec
Fnnnn= 60/4.363 =13.75
This is a constant cut speed expressed as inverse time mode but requires the radius for the calculation to be made. The two are fundamentally different.
Craig