How does this work

Not sure if I'm being stupid or just tired but how does the cutter advancement work on this?

**LINK**

There are several designs like this but I can't seem to think of the simplest way of doing it. I've made the arm and the post and even made a basic non (screw) adjustable head to check it works on my lathe ok.

It looks suspiciously like the all-thread is just a decoy ... Try thinking of it as just a plain push/pull shaft.

MichaelG.

I'd obviously like to withdraw as well as advance the tool with the screw.

I think it rotates both at the perfect plate and the pillar. Holding the ball and the ar the all thread goes through allows the cutter to move any where along the cutting edge.

Not very well put but perhaps you get my drift.

Howard

For perfect read ptfe. Pre-emptive needs to be turned off.

If all else fails ... read the instructions

**LINK**

MichaelG.

I know how the turner itself works, I've also made one for my metalwork lathe. I'm just unsure how the tool advances though on this particular jig. I think your first post may be correct though. If so its a bit different to other jigs I've seen.

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With respect, Vic ... I think the instructions make that reasonably obvious.

MichaelG.

Having looked at the instructions ( again) it doesn't advance in the normal sense. The threaded rod is (as I think you suspected) just a depth guide for repeatability. Unlike any other jig I've seen this one sacrifices some rigidity by allowing the head to swing. I would prefer to use a fixed head. Perhaps I posted the wrong example.

This one has a fixed post.

**LINK**

There are several others of similar design where also ONLY the arm swings around the pivot point. The head doesn't rotate.

It was so much easier when I made this as the cut is advanced with the cross slide!

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Now that is much nicer !!

I'm sure you could teach 'Paul Howard Woodturner' a thing or two about design and manufacture.

MichaelG.

Used to use one very similar in design but built in the early/mid 40’s to turn skittle balls out of “lignum vitae” on a peddle driven lathe (lathe later fitted with electric motor)