Another Swinging Threading Tool

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Darren:
I wasn't going to bother posting this as I've already posted something similar before ... but I had a slight mishap with a tool that I wanted to share so here goes ...

It's the first real threading job with the new swinging tool so I'll stick it on this thread.

All was going well, just taken the first scoring pass to check I had the right thread settings. 5/16x18 in this case. I didn't have a die so thought I'd let the lathe do it.

Then disaster, dialled in another 0.05mm/0.002" for the next pass and it took the tip off my brand spanking new carbide threading tool :doh:

I couldn't believe it, I thought these brazed toosl were supposed to be tougher than the insert type :scratch: But this one gave up just by looking at the job.

So, out with a stick of HSS and I ground both ends. One to 60deg and the other to 55.

Got to give HSS one thing, it sure does take some abuse

Anyway this is what I was making ... :dremel:

Bernd:
Nice save Darren.

I wonder if the brazing heat weakened the carbide tool?

At .002" cut it shouldn't have broken like that. Makes me wonder if it was cracked to begin with. Maybe dropped or hit with something else?

Bernd

Ned Ludd:
Hi Darren,
You must remember there are cheap and nasty Carbides, just like everything else these days. :( and unfortunately price is no criteria for judging cheap and nastiness. :( :(
Merry Christmas to all Modders mad or otherwise.
Ned Ludd

Twmaster:
Plans for this? I'm impressed enough to feel confident as somebody that's never done single point thread cutting that even -I- can do this! Now that you gents have refined this some I'm interested in making one.

John Stevenson:

--- Quote from: Twmaster on December 25, 2009, 10:26:13 PM ---Plans for this?

--- End quote ---

Plans ???
No need, it's very simple, the tool or holder has to swing with minimal play, it's located on some form of key or dowel to stop it twisting.
If someone was to publish plans chances are it wouldn't fit your toolholder / lathe anyway.

Sorry to sound harsh but you have you stand on your own two feet and wing it otherwise you will want you hand holding on every exercise.
Between this post and Bog's original one there are enough pictures to explain everything.

If you get stuck ask, people will think better of you for trying in the first place.

John S.

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