Re: [CAD_CAM_EDM_DRO] EMC one last question !!

whollid1@... wrote:

> I got the bdi disk. I installed it okay. I wired up the home and
> limit switches. with the help of you folks I got out of e-stop and
> have been having a blast homing and cruising around with it. I have
> however got 1 last problem. I am used to windows based, or dos based
> controllers. with these I would jog in to the edge of the stock, find
> my stock zero, and then zero the axis by means of some button and
> with xyz zeroed, away I would go. I home with emc and this sets
> MACHINE zero for all the axes, but, my question is; after I have
> jogged to my STOCK 0,0,0 how do I set the axes to zero so that the g-
> code can start from part 0,0,0 rather than machine 0,0,0.
> I know this should be intuitively obvious but for some reason I
> just cant get the missing part

There are several ways to do this. The easiest, if you don't mind using the

mouse in the shop, is to click the right mouse button over the axis
in question. With either the XEMC or TkEMC GUIs, a dialog window
will pop up to allow you to enter what you want that coordinate set to
in the relative coordinate system. That is the coordinates the part
program will be using. (The # (I think) switches between machine and
relative displays. The @ switches between actutal and commanded
displays, which only makes a difference if you have encoder feedback.)

The other way to do this (old CNC method) is to go into MDI mode
(F5) and enter something like G92 X-0.1 <return key>. It will set the
relative X coordinate to -0.1 user unit (inch or mm). If you are using
a co-ax indicator or some other method of getting right over the zero
point in 2 axes at the same time, then you can enter G92 X0 Y0 and set
them both at once.

I generally try to forget there is even a machine coordinate system.
That is a detail for the CNC controller to worry about, and not for me.
The only place it really matters is when powering back up the next day,
you don't have to relocate your fixtures.

Jon