Swingup external threading tool

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spuddevans:
I'm following this with keen interest as i do most of my threading on the lathe by single pointing. This is yet another item that is added to an ever growing list of mods to be made to my lathe.

oh well, better to have plenty to do than to stand in the workshop wondering what to do.

Tim

bogstandard:
Tim,

Don't be too hopeful, this is experimental, using a few known tricks that I know work. In theory it should work just fine, in practice, things can have a totally different outcome.

It is later, when I get to the very fine tuning that problems sometimes occur.

If it does work, then there are maybe thousands of newbies out there where it could help to solve their problems and make it easier for them to screwcut, if it doesn't, back to the drawing board.

John

bogstandard:
Only a very short post today.

I decided that I needed to get the main block cut out to see where I need to hack away at to give me clearance and access to the bits.

The first job was to get the main channel cut out.
Using tungsten cutters, this material just gets swept away, and very little heat is generated, so no suds needed, and unlike cast iron, you don't get dirty.

Once the main cutout had been done, I reduced what was left of the main block down to the thickness I wanted.

The main block heavy machining is now basically finished, it just needs lots of holes drilling in it now.

This is how the swinging bit will fit in.
The small thin file in there is to let me see what gaps I have to play with. The only point that the swing fitting will be in main contact with the block is at the back pivot point. The three lower faces, bottom and two sides will be controlled with limit screws, and by doing it that way, should allow the tool to be used for both right and left hand threading, as all cutting pressures will be taken by them rather than the pivot when in the cutting stage.
It also means that by supporting the swing part away from the main block, it shouldn't jam up or get put out of cutting alignment if a tiny bit of swarf gets in there.

Bogs

chuck foster:
looking good bogs.................i like to see tools being produced in the home shop. :thumbup:

chuck :wave:

Darren:
You do get a good finish on that mill John :dremel:

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