On Sun, Dec 27, 2009 at 08:50:00PM -0600, Jon Elson wrote:

> Drilling bolt circles would become TRIVIAL with this, touch off (0,0)
> at the center, set the radius and go in 60 degree increments for a 6-hole
> pattern, without consulting a calculator, or worrying about entering a
> wrong digit somewhere - been there, done that.

Yep, that is tedious and easy to screw up.  This would be easier.

> GUI should prominently show the different mode so you don't goof
> ...

With this scheme there are no modes, no new readouts, no new gcodes.
In any place where you would normally specify X and/or Y, you can
specify @R<T instead.

EMC behaves exactly as if you had specified X and Y such that 
X=R cos T and Y=R sin T.  It's nothing more than a shorthand.

I've incorporated Jeff E's suggestions and have a new patch (at
the same URL) and now it is an error condition if:

Your machine lacks X or Y axes (lathe)
You are not in the G17 plane
In a block you specify a polar coordinate along with an X or Y word

Chris


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