How does this work

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How does this work

This topic has 12 replies, 4 voices, and was last updated 29 April 2016 at 08:56 by HomeUse.

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27 April 2016 at 22:17 #236491
Vic
Participant
@vic
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.
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27 April 2016 at 22:17 #34667
Vic
Participant
@vic
27 April 2016 at 22:25 #236494
Michael Gilligan
Participant
@michaelgilligan61133
It looks suspiciously like the all-thread is just a decoy … Try thinking of it as just a plain push/pull shaft.

MichaelG.
27 April 2016 at 22:35 #236495
Vic
Participant
@vic
I'd obviously like to withdraw as well as advance the tool with the screw.
27 April 2016 at 22:36 #236496
HOWARDT
Participant
@howardt
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
27 April 2016 at 22:38 #236497
HOWARDT
Participant
@howardt
For perfect read ptfe. Pre-emptive needs to be turned off.
27 April 2016 at 23:35 #236501
Michael Gilligan
Participant
@michaelgilligan61133
If all else fails … read the instructions

**LINK**

MichaelG.
28 April 2016 at 10:34 #236538
Vic
Participant
@vic
Posted by Michael Gilligan on 27/04/2016 23:35:05:

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.
28 April 2016 at 10:40 #236539
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Vic on 28/04/2016 10:34:39:

I'm just unsure how the tool advances though on this particular jig. I think your first post may be correct though.

.

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

MichaelG.
28 April 2016 at 10:56 #236543
Vic
Participant
@vic
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.
28 April 2016 at 11:00 #236545
Vic
Participant
@vic
It was so much easier when I made this as the cut is advanced with the cross slide!
28 April 2016 at 14:50 #236564
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Vic on 28/04/2016 11:00:40:

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

.

Now that is much nicer !!

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

MichaelG.
29 April 2016 at 08:56 #236646
HomeUse
Participant
@homeuse
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)
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