I had to do some screw cutting on the lathe the other day so i'v put together this little 'how to' video. Hopefully it will help
anyone just getting started with screw cutting on the lathe.
Have you checked out Joe Pi's threading videos? Runs the lathe backwards with the tool upside down so for a RH thread you can feed AWAY from the
chuck.
Photo Archive
Building: up the courage for post thirteen thousand and one
posted on 9/6/20 at 09:07 PM
what's the story with the number dial? For M14 you said engage when any number 1 to 8 lines up - what would happen if you engaged at 8 for
first pass then say at 7 for second or engage at halfway between 7 and 8 for both passes?
Photo Archive
Building: My car is history now, burnt out,
posted on 11/6/20 at 05:49 PM
Now that my car has gone, I have no interest in having a lathe, but I did find the tuition very interesting, as I would never of known how to of cut a
thread even if I did have a lathe
However, my thread cutting technique with a pillar drill, vice and dies, was pretty good !!
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
quote:Originally posted by 02GF74
what's the story with the number dial? For M14 you said engage when any number 1 to 8 lines up - what would happen if you engaged at 8 for
first pass then say at 7 for second or engage at halfway between 7 and 8 for both passes?
8 on the first pass and 7 on the second would be fine.
I don't think you physically can engage half way between because the bit that that goes into the lead screw doesn't line up.
Depending on the pitch of the tread (for metric anyway) determines which numbers you can use on the thread dial indicator. you can use any of the ones
on the list from the lookup table in any order you like. Just don't use one that isn't on the list or you end up cutting a different
thread.
Hope that clears that up for you. Thanks for watching.
Thanks for that it took me back to being an apprentice, but most of the lathes in the workshop had change wheels so you had to spend a while doing the
sums, then swap the gears over to hopefully, get the right pitch.
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
