You might like to give: tracytools.com
a call. They are in the UK and list a 3/16 x 30 UNS on their site although currently no stock. They’re generally very helpful. > On 11 May 2023, at 17:16, andy pugh <bodge...@gmail.com> wrote: > > The Rivett 608 lathe has knurled screws to lock the micrometer dials. > These are quite long, going down the centre of the feedscrew and > pushing out a radial wedge. > > I am making some new feedscrews and have realised that these screws > are threaded 0.190" x 30 > > This is probably #10-30 though 3/16 is possible. However I have never > found a screw to be _above_ nominal diameter, so think it is #10-30. > > #10-30 is listed as an old ASME (pre-war) standard. But finding the > taps in the UK seems about as easy as you would expect. > > So, how else to cut the thread? Maybe a very tiny thread mill? > Single-point cutting might work, but it's a rather deep thread for the > diameter. And I don't have a suitable tool (such as > https://www.ebay.com/itm/383646508366 ). Thread-milling would be an > excuse to add live tooling to the lathe, and an almost-suitable cutter > is affordable: > https://www.shop-apt.co.uk/single-tooth-thread-mills-for-general-use-internal-60-partial-profile/internal-partial-profile-60-thread-mill-05-08mm-pitch.html > > -- > 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, 1912 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
