One option is to do as many plasma cutters do and define the tool setter
as Z home. Instead of probing you home to the tool setter. You can then
use work coordinates to set you Z0 anywhere you want. The big
disadvantage with this setup is that the machine now does not know where
the top of Z travel is so it would be easy to hit the top limit. If you
have plenty of Z travel you may be able to get away with doing it this way.
In the longer term being able to set per-tool limits would be very handy
in many cases. For instance it would be really useful for lathe work
where a Z error can be pretty catastrophic. Doing a rapid move into a
chuck doing 2000+ rpm is not something you want to experience!
Les
On 16/12/2017 21:50, Danny Miller wrote:
So, I did see that earlier, it CAN be used to zero Work Coords- but
ONLY if you use Bottom Datum. Many times, we use Top Datum.
If you just reassigned WC Z, then LinuxCNC should be able to see
lowest-Z is beyond the allowed Machine Coords automatically, but I
have doubts it could work- the file may not get reevaluted
automatically when WC Z is reassigned between the time Run is pressed
and we actually start user G-code.
However, Top Datum, that wouldn't apply at all. You can't reassign WC Z.
Danny
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