I found it worth the money to purchase the premium content article from mini-lathe.com on threading. I am a complete n00b but i was able to make successful right-hand threads without using a die on aluminum and drill rod (1/4-20, M6x1.0, M10x1.5) after my first few failed attempts.
Stephen
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Bruce, Can you explain How you cut threads, left or
right on a lathe. I understsnd that the lead screw
controls the pitch of the thread. but how do you cut a
thread and spiral to the next thread? Do you back off
the 29.5degree cutting tool by visual observation?I
understand this is why there is a a thread dial on a
lathe. Many machinists don't use them, How do they cut
threads? Are there any simple .easy to understand
,step by step books or articles on threading . I own
a Cummins 7x10 and a Jet 9x20 and can't cut threads on
either of them. Thankyou Bill Amaradio
--- Bernard Goguelet <phantomcow3@...> wrote:
Bruce Leo Hartmann wrote:
Yep, I made a new 10X1mm left hand lead screw
for the cross slide on
my old style Homier. I used 9/16" oil hardening
(although I didn't
harden the screw) drill rod. I made it 3/4" longer
than standard and
.007" larger in diameter. It cut very smoothly and
turned out perfect.
I did first order a 21 tooth gear from Uncle Rabid
and I made (and
used) a hand crank for the threading operation. No
problem at all.
Since you're doing 20 tpi you won't need any
special gears. A standard
thread file or 7/16" LH die will make the final
clean up much
smoother. Make sure your tailstock center is in
perfect alignment with
your headstock. You do not want ANY taper.)
--- In 7x12minilathe@..., Bernard
Goguelet
<phantomcow3@c...> wrote:
Has anybody cut left hand threads using their
mini lathe?
I am making a new leadscrew for this lathe,
7/16-20. At school i
threaded a left hand screw for the first time,
but this is an
industrial
machine. I could wait until monday to cut my
leadscrew, but im feeling
impatient.What has been peoples reactions to
left hand threads cut on
this machine?
-Bernard
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well, I decided i will use the lathe at school. I
dont trust my
headstock and tailstock alignment just yet. And the
one at school has a
taper of .002 over 24". Considering my new leadscrew
is not even half of
that, i can live with it :).
-Bernard
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