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Thread: foolproff threading
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26th Nov 2021, 01:32 PM #1human termite
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foolproff threading
made this tool up for thread cutting,works a treat ,cuts the thread ,reverse lathe move cutter in then cut again etc etc
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26th Nov 2021, 03:44 PM #2Gear expert in training
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It just looks like a standard insert threading tool...what am I missing?
Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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26th Nov 2021, 03:59 PM #3Most Valued Member
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I think this method relies on only retracting the tool by pulling on a lever, all other operations required for threading would then be followed.
If it is as above and depth of cut is set by the plunge method, a suitable advance towards the chuck on the compound may be required depending on how coarse the thread is.
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26th Nov 2021, 04:04 PM #4Gear expert in training
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Ohhh I see it now, the holder pivots on the bolt in the back.
Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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26th Nov 2021, 04:54 PM #5Diamond Member
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You might not need to pull a lever at all, it might retract itself as it reverses.
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26th Nov 2021, 06:41 PM #6human termite
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the tool cuts once the auto feed lever has been activated,when the thread has ended the direction is reversed,the insert bit lifts up and when it goes back to the start of thread wind in a little and go again,all the time the feed lever is down,no need to use the thread dial at all .......bob
https://youtu.be/YZkRNdXFYB8?t=19 sort of like this one
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26th Nov 2021, 06:58 PM #7Diamond Member
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Do you have plans for it, wouldn't mind making one
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26th Nov 2021, 08:26 PM #8
Hi Guys,
It reminds me of Professor Chadwick’s flip up tool holder !
Its been published in several books and magazines several times. If I can lay my hands on the pdf of the article, and assuming its not copyrighted I can post it here !Best Regards:
Baron J.
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26th Nov 2021, 11:50 PM #9
The pivot threading tool was a big hit around 10-15 years ago with many guys making them with many variations made to take out sideways slop.
I was always going to build one but life and issues got in the way.
Still threading today using the old school method, one day, lol
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27th Nov 2021, 12:55 AM #10
Hi Guys,
These links will help !
https://www.journeymans-workshop.uk/flipupth.php
https://www.model-engineer.co.uk/for...p?th=52176&p=1
And the plans PDF to go with it !
flipupth.pdfBest Regards:
Baron J.
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27th Nov 2021, 08:36 AM #11Diamond Member
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I always wondered about these flip up threading tool holders. Haven't made one yet.
(no reverse on the Hercus, and no big "washing machine pulley"
spindle handle, for manual cranking, like on Baron's?)
• On a fine thread, would the bottom of the cutting tool drag all the way back?
(i.e. slightly deburring the thread)
• What happens when they start to stick/jam on a big threading job?
(I guess it is just the end of the thread that would be slightly munged)
At least Bob's one here seems to have a manual lever to reef the tool up with.
• One of the designs I have seem was spring loaded.
You hold it down to start the cut,
the spring is held down by the cutting forces,
and as soon as it gets to the relief groove near the chuck, it pops up!
• Another design I saw was cam'd somehow.
Down and up were the stable/resting positions.
When you reversed, it pushed the tool up past the cam and well clear of the job.
It could also be used with an end stop ramp or pin, for threading without a relief groove.
• There might have been another one where the tool swung to the left and away.
You needed to hold it right to start each threading pass.
Just also had a thought: a large carbide insert holder, like an SER2020 or an SER2525,
would save some machining time for the flip up bit. Just drill a hole in it for the pivot !
Make sure it is a cheap one made from soft steel
Anyway, might have to add this to the mental to do list.
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27th Nov 2021, 01:33 PM #12Diamond Member
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28th Nov 2021, 01:31 AM #13Senior Member
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I'm not quite sure if my lathe can be flicked into reverse automatically but something to look into.
I stumbled across a similar holder for inside threads than might be of interest. https://www.youtube.com/watch?v=_KGYAmaNfXY
Pete
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28th Nov 2021, 09:08 AM #14Philomath in training
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Like Dave, something I've thought about off and on over the years; they also feature in model engineering magazines occasionally too.
I'm a bit uneasy though with things like this to do common operations, as while you use one, you are not actually refining the skills necessary to produce decent threads on any suitable lathe. Similar issue with parting - while lathe condition is a factor with parting as well, trick holders and rear tool posts don't always do you a favour. It's practice as much as anything with a lot of these operations.
Having said that, if it works for you, go for it.
Michael
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28th Nov 2021, 11:59 AM #15Most Valued Member
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I had to cut two 10x1.5mm male threads yesterday. I had my solid toolpost on the lathe and was too lazy to swap it for the compound. So I just used the crossfeed dial and added on 0.1mm with each cut. Used the half nuts and wound the carriage back to the start with the wheel (no reversing the lathe). First time I've cut a thread without using the 30 degree compound offset method. It worked a treat. I sometimes wonder if we overcomplicate things.
Chris
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