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General Mach Discussion / Z DRO depth reading incorrect??
« on: October 18, 2017, 08:07:25 AM »
Hi there,
I am fairly new to CNC so please forgive my noobness!
I recently purchased a 6040 that came with a dodgy copy of Mach3...but dont worry, i have not used that copy and instead purchased the real thing and am happy to provide proof if needed
Anyway, something is not quite right with how i have the Mach3 software setup as when its making a pass at 2mm in depth the Z DRO will always show a number such as 1.9975 instead. I have just calibrated the motors and this has improved things and the same pass will now show as 1.9988 on the Z DRO but surely it should be showing 2mm? This follows suit for each 2mm depth pass as well..so the Z DRO is showing 1.9988, then 3.9988, then 5.9987 etc etc rather than 2, 4, 6, 8 etc
I have even turned off the actual CNC machine and run the cycle unconnected and the Z DRO still shows the exact same number
I was thinking that Fusion may be the issue and that Mach3 didn't like the G code it was producing but even when i run the Mach3 wizard and use it to make a circular pocket at 1mm in depth the Z DRO shows the depth as 0.9988 instead...why does it not show as 1mm on the DRO??
And quite often, when i press the Go To Zero button it won't go fully to zero...instead it may read something like X 0 - Y 0.25 - Z 0.25
The actual cut depth of the workpiece plus the other dimensions are fairly accurate, but why does the DRO show values such as 1.9975 instead of 2 when 2 is what the pass should be?
Any help or advice would be greatly appreciated
I am fairly new to CNC so please forgive my noobness!
I recently purchased a 6040 that came with a dodgy copy of Mach3...but dont worry, i have not used that copy and instead purchased the real thing and am happy to provide proof if needed
Anyway, something is not quite right with how i have the Mach3 software setup as when its making a pass at 2mm in depth the Z DRO will always show a number such as 1.9975 instead. I have just calibrated the motors and this has improved things and the same pass will now show as 1.9988 on the Z DRO but surely it should be showing 2mm? This follows suit for each 2mm depth pass as well..so the Z DRO is showing 1.9988, then 3.9988, then 5.9987 etc etc rather than 2, 4, 6, 8 etc
I have even turned off the actual CNC machine and run the cycle unconnected and the Z DRO still shows the exact same number
I was thinking that Fusion may be the issue and that Mach3 didn't like the G code it was producing but even when i run the Mach3 wizard and use it to make a circular pocket at 1mm in depth the Z DRO shows the depth as 0.9988 instead...why does it not show as 1mm on the DRO??
And quite often, when i press the Go To Zero button it won't go fully to zero...instead it may read something like X 0 - Y 0.25 - Z 0.25
The actual cut depth of the workpiece plus the other dimensions are fairly accurate, but why does the DRO show values such as 1.9975 instead of 2 when 2 is what the pass should be?
Any help or advice would be greatly appreciated