Code G92 problems

[Booneandbuck]

I’m using sheetcam and Mach3. I’ve tried everything to get my cut height correct but everyone it comes down touches and raises over 1/4” to pierce instead of .15. I’ve tried everything that I can find. If I manually change the G92 Z-0.28 to G92 Z0 then it works correctly but I would have to manually change every pierce. What am I missing?

[acourtjester]

You need to change the post processor in SheetCam that had the correct setup for that. Here is one that should work, you will need to import it into SheetCam shown in the image.

Mach3 plasma mod Floating HeadTHC with probe Home at end.rar

(1.4 KiB) Downloaded 9 times

Mach3 plasma mod Floating HeadTHC with probe Home at end.rar

(1.4 KiB) Downloaded 9 times

Mach3 plasma mod Floating HeadTHC with probe Home at end.zip

(1.5 KiB) Downloaded 7 times

Mach3 plasma mod Floating HeadTHC with probe Home at end.zip

(1.5 KiB) Downloaded 7 times

float head.JPG (59.47 KiB) Viewed 2637 times

float head.JPG (59.47 KiB) Viewed 2637 times

[tcaudle]

As Tom stated you have a problem in the POST. In most MACH3 posts the touch off is a hard coded event in the POST that uses a set variable for the Z SwitchOffset. Its the distance past zero that it has to subtract from the Z to be at zero (topof material) . If you have ohmic touch off you have zero offset. If you have a mechanical switch you have to determine the offset by testing. The move to .150 is from the Z zero point .

[acourtjester]

Here is a video showing how to find the switch offset if you are using a floating head switch. This value then needs to be changed in the post processor you are using so it will place it into the G-code.