Explanation:
Someone on the forum has noticed spurious "Program exceeds extents"
messages after switching from 2.4 to 2.5:
http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,38/id,11750/lang,english/

Copying his config, I get exactly the same problem in 2.6 but not in 2.4.3
(I have seen the problem myself, too, but always assumed I had messed
something up).

Modifying axis to always raise the error and also to report out the
machine max and calculated extent gave the following results:

2.4.3 Machine Max 6.550, Program Max Y 4.499 (confirmed true by
running the program)
2.6 Machine Max 6.550, Program Max 7.937.

The forum poster noted that the error wasn't raised if he took out the
toolchanges. The Z-offset in his tool table for the selected tool was
3.438. This is exactly the difference between true Y max extent and
2.5 / 2.6 calculated max extent.

The patch I have posted makes 2.6 agree with 2.4.3 about program
extents. I don't know if it is a correct fix though, nor whether
changes need to be made to the alternative code block which follows.


-- 
atp

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