Barrie, I have found that it is safer, for me anyhow, to "screwthread backwards", finding the internal shoulder by "feel" than it is to stop the internal threading tool without smashing it into said shoulder by threading in Forward. Al --- Barrie Purslow <bpduo@xxxxxxxxxxxxx> wrote: > Al, > > > For the past several years, especially when > threading > > to a shoulder or doing an internal thread, I grind > the > > tool "backwards, mount it where it is in the "back > > side" of the hole and thread in Reverse with the > > spindle turning in reverse, with the threading > tool > > backing out of the hole towards the headstock. > > Neat trick. Next time I will try this. > > Barrie > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject line. > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.