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Improving single point thread quality?
- Thread starter LVLAaron
- Start date
- Joined
- Oct 4, 2020
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- 484
The two close ups are a teslong bore scope with the reflector removed.
- Joined
- Dec 26, 2015
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- 2,079
Your RPM's are too low. Work out the proper SFM.
- Joined
- Dec 3, 2017
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- 1,911
So its 59.5 on this compound? Why even say 29.5, if the witness mark is nowhere near that indication? I'm not scolding the OP by the way. I'm just trying to blame someone else for my SEVEN YEAR RUN of never successfully cutting threads...
- Joined
- Oct 4, 2020
- Messages
- 484
It should be (happy to be wrong) 60.5 with the marks on my machine - this provides relief on the right hand side of the cutter so it doesn't rub. I think it's an "american vs import" lathe thing.
- Joined
- Dec 18, 2019
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- 6,464
- Joined
- Oct 4, 2020
- Messages
- 484
I'll be working up against a shoulder... so naturally I'm nervous about crashing the machine or wrecking a 400 dollar part. I did some testing with the spindle in reverse and using an internal threading insert on the outside of the part.
Will play around with it tomorrow when the bourbon wears off.
- Joined
- Dec 18, 2019
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- 6,464
Start your own thread on threading. We will all try to help you. It is a good skill to have.
- Joined
- Jan 20, 2018
- Messages
- 5,640
I was going to point this out, but we all know how intimidating threading is in the beginning, even at low speeds. HSS would probably a better choice for learning to thread. With the angle corrected, things should be better.