On Monday 07 October 2019 14:57:17 Stuart Stevenson wrote: > https://m.youtube.com/watch?v=WRuh7zgnUa0 > > This, but with a single point you must helical for the entire thread > length. > > On Mon, Oct 7, 2019, 1:48 PM andy pugh <[email protected]> wrote: > > On Mon, 7 Oct 2019 at 09:17, Stuart Stevenson <[email protected]> wrote: > > > John, > > > We are talking about threading with the boring bar. Use a boring > > > bar in > > > > the > > > > > mill with a threading insert. You can thread any diameter OD > > > > Are you talking about this method? > > https://youtu.be/i4fTythQj5s?t=60 > > Yes, the xy can be done in gcode or with a boring head. If gcode, needs low and well compensated backlash. I think my G0704 can do it, although spindle torque might be a bit puny for bigger holes implying faster surface speeds. Tip contours might be a problem at hole sizes less than say 3/4" (2cm) in diameter, but you'll see the boring bar flexing as the lower face of the chip starts dragging in smaller holes. I expect it would continue to cut, but would take more spring passes to get to the final size. > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users
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