A quick search for #10-30 turned up several links in the US, but I assume
shipping to the UK should not be too bad?
https://www.victornet.com/detail/TAST-10-30.html
https://www.biscotoolsupply.com/10-30-special-hand-taps
On 5/11/23 12:01, Peter Hodgson wrote:
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
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