[happytriger2000]

Hi,
I started converting a cnc router to a plasma machine, made a floating head for this machine today but not quite sure how to set Z axis offset.

This is what I have done so far:
Machsupport :: Plasma Floating head moving video by happytriger2000 - Photobucket

The Microswitch is wired at port 1 pin 12 and +5v.

Read some post related to floating head setups, and the following is what the Z axis should do before piercing

G00 X6.000Y6.000 (rapid to first pierce point)
G28.1 Z.5 (move Z down towards material and Z home switch is tripped)
G92 Z0.000 (reset Z DRO to zero)
G00 Z .085 (raise Z to Swtichoffset value so tip is setting on top of material)
G92 Z0.000 (reset Z to zero as top of material)
G00 Z .125 (raise Z to pierce height
M03 (fire torch)
G01 Z0.063 F60 (plunge Z from pierce height to initial cut height)

My question for now:

1. If I use Sheetcam would it produce the code above with all the correct values entered in the tool chart?
From the video I sent, when the z axis lower down it stops when the switch is hit, what do I do next, Do I zero the DRO and raise the z axis above the plate manually? or is there another way of doing this?

thanks,

[Ubatoid]

As far as I am aware, all you have to do is enter your POST variable "switchoffset" in Sheetcam.
I am sure someone will come aslong soon with a better answer, but it should give you something to go on.

And now Ive said that, Ive just found this thread with an excellent answer from uncle Thom

[happytriger2000]

Thanks,

Can the offset be done without using Sheetcam software?