Re: [CAD_CAM_EDM_DRO] Re: Gcode

andrewyslee wrote:

> --- In CAD_CAM_EDM_DRO@y..., "robert charles weiss" <bobweiss@a...>
>
> > > On most controls, there is a "tool table" that has length and
> diameter
> > values
> > > for a number of tools. Most CNC controls use some function like
> > > G41 D04 to tell it to use the diameter of tool #4 for this cutter
> offset.
>
> Then what are these?
>
> G42 Haddress
> G42 Daddress

G43 D04 is an example of G42 Daddress, where "address" is replaced by the
number of the tool entry in the tool table. The G41 (cutter LEFT of path)
and G42 (cutter RIGHT of path) perform the offset in opposite directions,
depending on which side of the part you are offsetting to.

I'm not sure what the G42 Haddress does, but the H word is for calling up
tool LENGTH offsets from the tool table. G43 H04 would apply a tool LENGTH
offset for tool # 4.

> In a mill, one will set the program zero by touching a point on the
> workpiece surface.

> For a lathe, how does one set the program zero?

For diameter offsets, you can turn a length of a test bar, measure with a
mike and then set the offset. You need a different offset for each tool,
that's why the tool table is such a big help. If you leave your tools in
quick-change holders, then you can just put them back on and the offsets
will be saved for you.

Jon