This is a good explaination coordinate systems. 
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?CoordinateSystems

The var file info is here 
http://www.isd.mel.nist.gov/documents/kramer/RS274NGC_3.pdf  on page 13.
----- Original Message ----- 
From: "Cecil Thomas" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Sent: Monday, October 29, 2007 9:58 AM
Subject: [Emc-users] var file source listing


>I have searched the users and integrators manuals and can't find this
> but maybe I've missed it.
>
> When strange things appear on startup of my axis or tkemc it is
> usually because there is a value stored in the .var file.
> If I zero out the strange numbers and save the .var file and restart
> it usually fixes the problem.
>
> I would really like to trace down how the values got there in the
> first place.  Probably because I was doing on-the-job-training using
> G54, G92, G28, G30, etc. without fully understanding what I was doing.
>
> If I had a listing of each variable and what G command causes it to
> be changed I could then look at how I got into the situation in the
> first place and maybe use the same command in the program to reset
> the variable.
>
> I know that the discussions of each of the commands mentions which
> variable it sets but to find the culprit I have to go through each
> command searching for the variable number.
>
> I guess I'm looking for the "reverse directory" for the .var file.
>
> Thanks,
> Cecil
>
>
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