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I've been trying to wrap my head around how to turn a wooden vise screw on the lathe (around 3 to 6 TPI) . I've looked at Thread chasing and a few jigs, but the have a few problems:

The thread chasing appears to only be for small length high TPI threads

The threading jigs I've found ( purchased or otherwise appear to do short distances and high TPI as well)

The router jigs appear to be a valid option but I can't find a purchased or plans for how to attach a router to the lathe bed...

I've been looking at how it's done on a metal working lathe and it appears quite simple, the main drawback on the wood lathe is the lack of a lead screw, I have debated hooking up a stepper motor with a lead screw and attaching a cross slide vise on the lathe but it just seems like this should be easier and I'm missing something fundamental....

I basically want to have a system that will allow me to turn a wooden thread ( external AND Internal ) with relative ease and not being tied to an existing lead screw for the TPI...

I hope this makes sense and someone can point me in the right direction....

Something like this is what I'm trying to make:

Wood Vice screw https://www.theenglishwoodworker.com/wp-content/uploads/2018/04/maguire-wooden-vice-screw.jpg

P.S I know I could get or make a tap and die set for wood but they are over 800 euros...

https://www.fine-tools.com/gewind.html

TL;DR is I'm trying to create a 3tpi screw vise on the wood lathe and can't figure out how to do it....

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    You're not alone here, you're on a path many others have trodden before you so it's not going to be difficult to find solutions. But from what I've seen the first thing you need to do is ditch the idea of using the lathe (except for turning the dowel of course). There's plenty of detail and obvious previous research in your Q (bravo for that BTW) but I think you've placed yourself behind the 8 ball thinking you can do this on the lathe. You can absolutely do this on a metalworking lathe, but they're specifically designed to allow for that sort of operation, alone with the needed toolholding.
    – Graphus
    May 10 '21 at 23:27
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    Also some clarifying questions, are you hoping to be able to do this repeatedly or for a small number of multiples, or do you just need one threaded dowel and associated nut for a single vice? Are aesthetics important or are you okay if the result doesn't look that perfect, as long as it provides a firm grip? Does the dowel diameter matter (I mean is this a fixed requirement or do you have some wiggle room)? Last but not least, 3 TPI or just something approximately that coarse?
    – Graphus
    May 10 '21 at 23:35
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    "it seems like the right tool for it" But what if it isn't? This is completely doable — regardless of what your requirements actually are — but just think of all the people who have done this not only without a lathe but prior to electricity.... or even steam power for that matter :-)
    – Graphus
    May 10 '21 at 23:38
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    ...you can even do it without screws, comme ça :-))
    – Graphus
    May 11 '21 at 0:01
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    Never mind, if you're set on doing this on your woodworking lathe then my comment is completely outside of what you're looking for.
    – Graphus
    May 11 '21 at 0:27

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