On 06.02.12 03:36, gene heskett wrote:
> On Monday, February 06, 2012 03:25:49 AM andy pugh did opine:
> > I don't think that is obvious at all. In fact I think that G92 is the
> > wrong way to do this, and the tool table is the right way.
> >
> > I would suggest that what you should do is use your probed length to
> > set the tool-offset (G10 L1 or G10 L10, and G43) and use the
> > hole-finding routine to set the coordinate system origin (G10 L2, or
> > G10 L20)
>
> I'll look at that in the morning Andy,
Gene, remembering your post about distaste for the tool table, Andy's
opening sentence might put you off what seems a good suggestion, further
down.
Would G43.1 "Dynamic tool compensation" be the neatest way out of the
tool length problem? If you provide it directly with your probed length
as Andy suggests, then there is no need to go near the tool table.
And if anyone can say whether the "Xn Yn ... Wn" list is really any
different from "axes", as used elsewhere in the doco, then that'd help
the grammar documenting exercise too. ;-)
...
> The latest idea won't use it, turns out that G92 axis axis etc is entirely
> too promiscuous because on about the 30th read I finally understood that it
> was playing with axis's that weren't named on the line invoking it. It
> turns out that the G92.1 is only valid as a recovery means if that axis is
> first driven to exactly the same position it was in when the G92 axis was
> invoked, otherwise there is a cumulative error that attempts to drive the Z
> clear off the top of the post on about the 3rd usage in the middle of a 7
> tool drill file.
Andy's G10 L2 or G10 L20 go with your G54 to G56, or however many of the
9 you're using, AIUI. My limited understanding, stated in a request for
confirmation a couple of posts upthread, is thus far:
» Do the two "docs" sections mean that L2 sets the nominated workspace
[i.e. coordinate system] origin to "axes", expressed in the currently
active coordinate system, while L20 sets the current position in the
currently active coordinate system to be the position in the
nominated workspace given by "axes"?
«
The doco doesn't seem entirely explicit, so it's taken a bit of
inference to work out the above.
Erik
--
"Research is what I'm doing when I don't know what I'm doing."
-Wernher Von Braun
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