Hi All,
here is a small .exe program for converting G-Code from mm to Inches and Inches to mm, it will also scale to any size you require, with in reason.
The program needs no installing, just double click to run it.
Click 'input file' to select the source file
Click 'output file' and enter a new file name, you can't read and write to the same file name.
Select conversion options.
Click convert.
That's all there is to it.
Try it and see if it works for you.
There is a later version of this program higher within this thread that has no limit to the number of lines of g-code it will convert, this version has a line limit of 32000.
Link to Later version :-
http://www.machsupport.com/forum/index.php/topic,2893.msg39920.html#msg39920Regards
Graham.