Automatic touchoff of face mill

I am having another go with this:

andypugh wrote: G53 G0 X[100 - #5410] Y100

It turns out that #5410 is always zero for me. I have added a non-zero diameter in the tool table for a specific tool, reload the tool table and change to that tool. Still zero.
Ideas?

/Chris

Odd, it works for me in a simulator.

Had some more time to tinker with this. It turns out that #5410 et al contain information about the *current* tool, not the one we are changing *to* and so cannot be used in the remap code. I suppose that enabling cutter compensation would suffer from the same problem. Is there a way to find out the tool diameter in the remap code?

cahlfors wrote: Had some more time to tinker with this. It turns out that #5410 et al contain information about the *current* tool, not the one we are changing *to* and so cannot be used in the remap code.

G43 takes an optional H parameter, so you can issue a G43 to load the offsets for the next tool and read out the diameter from #5410 without physically changing tool.
You probably then want to zero-out the offsets (G49) before probing and finally load the new offsets at the same time as issuing the M6.

andypugh wrote: G43 takes an optional H parameter, so you can issue a G43 to load the offsets for the next tool and read out the diameter from #5410 without physically changing tool.
You probably then want to zero-out the offsets (G49) before probing and finally load the new offsets at the same time as issuing the M6.

I think we are OK on the G49. It is already in the remap code, but #<_selected_tool> still refers to the old tool. Where do I have the value for the new tool? It doesn't seem to be set until after M6 is complete?

Thanks,
/Chris

cahlfors wrote:

andypugh wrote: but #<_selected_tool> still refers to the old tool.

Which prolog are you using? The one I just looked at uses #<selected_tool> without the _

You need to do the M6 in your remap at some point anyway, why not do it early in the routine so the numeric parameters are accurate?