Hi Chris,

> The manual I have (but can't find) for a (mumble mumble) Fanuc
> lathe control says I,K are still radius even when X is diameter.  I
> don't know how universal this is.  But it makes sense to me - when you
> talk about the radius of a feature on a lathe part (like a fillet) you
> don't double or halve it.  You only do that for diameters.
>   

Hmm, either way is pretty confusing. Off-hand I can't remember how Mach 
does it. I do know it usually takes me a couple of tries to get it right :-)


> I don't think it would matter what is actually in the tool table, but
> G10 L1 P.. X.. should probably take a diameter in diameter mode.
>   

Good point. If read_x (see below) is tweaked, any G code that expects X 
should work in diameter mode.

> AXIS is the only GUI that displays radius and diameter.  It seems like
> the GUI issues are very minor compared to the interpreter.

Looking at the interpreter, it appears that X is always read with the 
read_x function in rs274ngc/interp_read.cc. If that is the case, a 
simple tweak to that function should be all that is needed. What is 
would be the 'approved' method of enabling a radius/diameter function? A 
parameter or maybe a setting in an ini file somewhere?

I'll take a look at the AXIS code and give myself a crash course in tcl/tk.


>   If you
> cannot do all of it, just do what you can and then ask for help.  All
> the developers do that sometimes.
>   

Thanks. I'll scream if I need help. It is likely to be a while before I 
do much to this. I probably won't be getting the machine for a month or 
so then I need to do the electronics and modify the cabinetry so it will 
fit in my workshop. Actually it will fit without modifying the cabinet 
but then I won't :-)

Les


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