Paul = sorry to but in on your post, but I have also asked for some help with tool offsets I have tried various combinations without much success. I can get the offset, but not the one I was expecting. I noticed your file "bogie equaliser" and wondered if you were machining miniature railway parts. Thats what I am doing at the moment.
The reason I butted in - I also use Turbo Cad - I have had it a long time - several years now, but my version does not write G Code. Can you get an add-on for this. I quite like Turbo Cad and would like to keep using it if possible.
Heres hoping Graham comes back with the reply to our G40 query.