Re: emc in polar coords mode?

["Raymond Heckert" <jnr-at-antigopro.net>]

I don't know how EMC implements it, but my Sharnoa CNC-VMC uses polar
coordinates exclusively for all circular moves, and I really like it. 
They use G10 for polar rapid, G11 for polar linear, G12 for C-W
circular, and G13 for C-C-W.  Words used with the polar set are I & J
which specify ABSOLUTE center, relative to HOME, R(adius) which can be
a real value, or incremented, C, the programmed finish angle is between
0 and +/- 359.999 deg.  To do a full revolution, just don't specify
"C".  In G10 mode, the Z axis moves UP *before* any X & Y moves, or
DOWN *after* X & Y moves to avoid crashes. You usually set your X-Y
start location using the G10, set the Z depth with the G11 command,
including the F (feed) word, then do your G12, or G13, or even another
G11. G41 or G42, if used must be set up in a block preceeding any X-Y-Z
move, and may require a P word if the offset is not perpendicular to
the direction of the G11, G12, or G13 move. You also have the option of
using G00, and G01 for (linear only) cartesian coordinates. This is
pretty much the same as WELLS-INDEX machines. If you get no other info,
I can 'excerpt' some info for you, to see if that helps.

RayHex

----------
> From: dennis pantazis <dennis-at-pantazis.org>
>> 
> greetings all:
> i was told that i could run emc in polar mode. is this an
un/documented
> feature?
> where do i begin to look for documentation on this? i do not recall
this
> anywhere.
> 
> i would like to build a device that would be used with r & theata.
> anyone have any experience in this?
> 
> i will admit that i have been focusing on building a camtronics
stepper
> driver board and have not spent much time on emc.
> 
> tia
> 
> dennis