Re: [CAD_CAM_EDM_DRO] emc g92

Jon,

Another way which I use is: bring the spindle down about an inch leave it unlocked with tool installed then bring the knee (servo driving the knee) up contacting the workpiece with cutter. I then lock the spindle, zero out Z and then step jog Z+.010. I run the cycle with the approximate .010 offset and when cycle is complete I check it with depth mic or caliper/rod and step jog the offset correction on Z to the target dimension. Works perfect everytime. I dont gamble on G92 fixture offset/resetting zeros within a part program, there is plenty enough to go wrong without inviting more troubles. To zero out an axis at any time in mach2 there is a convenient "zero" tab right next to the axis value window.

Ron

Jon Elson <elson@...> wrote:

Tom Hubin wrote:

>I gave up on EMC and use TurboCnc primarily because I have found no way
>to reliably set the axis values from within a Gcode program.
>
>

Maybe I should describe how I set up my tools on simple workpieces.
I lower the tool ontil it is almost touching the work. I then slip a piece
of paper that I know is .005" thick under the tool, and jog down until
the paper is pinched. I then right click on the Z axis and type .005
and hit the enter key. For X and Y, I use an edgefinder and jog over
until the edgefinder deflects to the side, then I stop the spindle (F9).
I right click on the axis, enter either .1 (the radius of the edgefinder)
or -.1, depending on which side of the part I'm on. Then, hit enter.

If I'm doing something that requires changing tools several times, I can
put the offsets for the different tool lengths in the tool table, and set up
the program to select the right tool offset with G43 H(tool #).

Jon



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