Re: [CAD_CAM_EDM_DRO] Digest Number 3520

> Date: Wed, 10 Dec 2003 14:32:43 -0000
> From: "Asim Khan" <asimtec@...>
> Subject: EMC related Question G54 G55,... and use of 5241, 5242, 5243
> variables [asimtec]
>
> Hi group!
>
> I want to learn the purpose of G53, G54,G55,... and how to use 5241,
> 5242,5243... variables in EMC?
> I am a bit confused about the cordinate systems used in EMC.
> Do we need to set these variables by editing the .var file? to use
> them or is there some other method?

The coordinate systems are designed to allow the same g-code program to be
run in several different positions within the work envelope. Imagine
that you have three or four vices on the table. They all hold the same
part. Rather than writing a new program with different locations for
each, you can set a g55 for the first, g56 for the second, g58 for the
third, and g59 for the fourth. Then all the operator needs to do is
repeat the program with the relevant coordinate system called up between.

In addition to using the gcode to set coordinate systems, you can use a
script named Set_Coordinates to do this. It also has a per axis teach
facility. The graphical interface used for Sherline also has the ability
to offset probe position by the diameter or length of the probe. This
interface is available in the repository at SourceForge.net.

As a side note, g92 coordinates are also stored in the var file as
5211-5216 but I don't recommend using them. There is a paper I wrote on
g92 in the dropbox at linuxcnc.org.

Hope this helps.

Ray