Swingup external threading tool

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DaveH:
Ade,

Thanks for the reply.

Even the normal way is a bit tricky if I only have a mm or two to play with. :doh:

Strange you should mention John's lathe, mine is the same, only a much earlier model 1990 ish.

No brake though. I can and do cut threads just a bit slow. :(

I was just wonder how others get on without a brake.

Also does anyone use a "swing up" or simular tool without a brake.

DaveH

wheeltapper:
I use my one on a Chester Comet minilathe , that hasn't got a brake and the lowest speed is 100 rpm.
I cut a runout groove with a parting off tool and I seem to manage.

when I tried this tool out I cut a 1.5 thread on a lump of 1" mystery steel and using the forward and reverse buttons it made a reasonable job at 200 rpm and my reactions aren't as sharp as they were. I say reasonable because it was a grunchy bit of metal and I didn't use any lube.

I couldn't see any deflection or wobble either.
I like it.

Roy

AdeV:

--- Quote from: wheeltapper on June 08, 2011, 06:57:49 AM ---100 rpm.

--- End quote ---

:bugeye: :jaw: :bugeye:

I thread at either 35rpm or 59rpm, and I reckon the latter one is a bit swift!

I must admit, I don't cut myself a relief at the end of the thread; I just watch it & wind the cross slide out at the end of the last groove, simultaneously disengaging the drive. It usually works out OK...

DaveH:
Roy,

There is not a chance I could accurately stop my lathe within 1 mm. I have even tried to (measure) how far it will run after the stop switch at different speeds. Even thats not constant (depends on the depth of cut / type of metal).

Cutting a 1/2" thread up to a shoulder (1mm) can be a bit tricky.

Really not good for "m'nerves" :doh:

I can do it but what a pain. :hammer:

A brake and this type of holder seems a good way to go. :)

Any more thoughts.

DaveH

DaveH:
Ade.

I have 60 90 200rpm

If it is a bit tricky I use 90 rpm otherwise 200rpm. The 60 means I have to change pullies - danm I'm lazy :doh:

And if it is really really tricky I turn the chuck by hand - that's slow :D

and it makes my arm ache :(

DaveH

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