On Fri, Aug 31, 2007 at 01:14:37PM -0500, Stuart Stevenson wrote:
> Gentlemen,
> I have a request. I would like someone to program a probe cycle to
> do this. I would like it in python. I want to have the probing cycle
> for my machine but even more I would like a simple program to compare
> with this to help me learn python.
Stuart,
Probing to find the center of a hole can be done strictly inside gcode
without any external program's help. The procedure could be:
The operator installs the probe and jogs it into the hole
The operator runs holeprobe.ngc which alternately seeks the X
extents, moves X to the average of them, seeks the Y extents,
moves Y to the average of them, etc. This will converge very
quickly to the center of the hole and the probe tip size is
irrelevant in the calculation. (I think this is the algorithm you
proposed or very similar to it.)
With the probe still at the center (but maybe raised),
holeprobe.ngc exits.
Now the operator uses "Touch Off" to set any coordinate system
however he chooses.
This seems like a natural and straightforward way to do it.
That being said, if your intent is to learn python instead, that's
cool. But, there are some gotchas that come to mind. Reading and
rewriting the var file by an external program while EMC is running is
likely to cause troubles. Making a gui for an external python program
to collect values from the user is a lot of work, and most of what
you want is already done in AXIS's touch off interface.
Chris
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