Die nut

[RainbowsParticipant @rainbows]

Can die nuts be used to form a thread on steel bar? I remember reading somewhere that they are designed to touch up existing threads. Nut in question would be 1 1/4" BSW.

[RainbowsParticipant @rainbows]

[Michael GilliganParticipant @michaelgilligan61133]

In a word … No

[now waiting for somebody to prove me wrong]

MichaelG.

[JasonBModerator @jasonb]

As Michael says, even if it were a split die you would probably rip your vice off the bench trying to turn it round with a 4ft scaffold pole on the end of the diestock. Really only for cleaning up existing or final chasing of a partly screwcut thread.

 

Edited By JasonB on 09/07/2016 15:22:19

[MWParticipant @mw27036]

Well, i haven't seen a BSW one but i've found dies online that will go larger than an inch, but i haven't ever cut one that big before, biggest i've got is M16. that was using a 2" stock. 

Michael W

Edited By Michael Walters on 09/07/2016 15:32:49

[Anonymous]

Here yer go; die on the left is 1-1/4" BSW, the other is 1-1/2" BSF, both 3" diameter:

Andrew

[Michael GilliganParticipant @michaelgilligan61133]

Michael & Andrew … I'm a little confused

How do your replies relate to the original question ?

MichaelG.

[RainbowsParticipant @rainbows]

I believe Micheal was replying to Jason who thought that a die for such a large diameter might not exist/ be practical then Andrew was replying to Micheal saying he had never seen a BSW

[Michael GilliganParticipant @michaelgilligan61133]

Thanks … I will just get back in my corner.

MichaelG.

[MWParticipant @mw27036]

Well the split nut clearly shows it could be cut. So the answer is yes, i reckon you could do it. Hasn't anyone seen the sort of dies used for pipe threading before, they're huge. (Now those are probably just for cleaning/repair) But i don't think a 1" Dia. thread with a coarse pitch is too big a push in 2 passes. 

Michael W

Edited By Michael Walters on 09/07/2016 17:14:54

[JasonBModerator @jasonb]

Pipe threads of a similar diameter are a much finer tpi so you are removing about 26% the metal you would with a 1.25 x 7tpi whit dienut.

The other advantage when using pipe cutting dies is that they have a lead in guide as part of the die. They are made to cut threads not clean & repair. I use this one quite often but even with something fairly small like 3/4 " BSP (just over 1" OD) it takes a lot of effort. This one is being used for 3/8" BSP on a model.

Also worth remembering that Rainbows wants to use this as a lathe spindle so got to be nice and true. It was the practicalitioes of using a big die that I was pointing out not querying their existance. Michael W just becasues split dies exist doies not mean they will easily cut from scratch, they can be used to chase as screwcut thread and fine tue the fit whereas a diesnut can't be fine tuned.

The other proplem with cutting big coarse threads is physically holding the part, you really need a pipe vice with its serated V jaws as a chuck or bench vice will be hard to do up tight enough.

 

Edited By JasonB on 09/07/2016 18:29:10

[davebParticipant @daveb17630]

I tried a 1" die when making some keel bolts, no luck at all! I screwcut the threads and finished them with the die. I suppose a guided die may work if you have to do it this way. I've cut hundreds of 25mm conduit threads by hand, it's a bit tiring if you spend a day doing this. The spec of the steel may be the decider.

[roy entwistleParticipant @royentwistle24699]

Michael W The original question was regarding the use of a die nut

[MadMikeParticipant @madmike]

Die but is strictly for cleaning up existing threads. For up to 2 inch diameter BSW taps and dies Tracy Tools have them in stock. HTH.

[MadMikeParticipant @madmike]

That should read "die nut" of course. Link to TT is on this page as one of ou "Shopping Partners"

[martin perman 1Participant @martinperman1]

At work we occasionally have to cut BSP threads for 4" pipe etc, this is done with an electric pipe thread cutter and it certainly makes the machine grunt cutting the thread.

Martin P

[RainbowsParticipant @rainbows]

Tracytools only go up to 1" for BSW as far as I can tell?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Rainbows on 09/07/2016 19:21:55:

Tracytools only go up to 1" for BSW as far as I can tell?

.

Available here, if you must

… But I would really advise against trying.

MichaelG.

[MWParticipant @mw27036]

Posted by JasonB on 09/07

The other proplem with cutting big coarse threads is physically holding the part, you really need a pipe vice with its serated V jaws as a chuck or bench vice will be hard to do up tight enough.

 

You know, i've got a pipe vice and it's been a dust collector for ages, i bought it thinking i'd use it to cut up alot of bar and now i just part off or use the bandsaw and i really wondered why i got it, i asked my mate who's a farmer if he wanted it for the yard, and he said he's also got one and can't think of what to do with it!(he also referred to it as a "pipe bender" rather than a vice)

 So now i know what i can use it for. I literally couldn't give the thing away. damn.

Michael W

Edited By Michael Walters on 09/07/2016 20:18:52

[Neil WyattModerator @neilwyatt]

This for your mandrel nose, I guess?

I would screwcut it, there's no way a die that size will cut a spot on thread straight off. You CAN use a die nut to finish the screwcut thread.

Neil

[MWParticipant @mw27036]

Posted by Neil Wyatt on 09/07/2016 20:18:09:

This for your mandrel nose, I guess?

Well my guess is steel bar could be anything, hence why i thought i was being relevant.

Michael W

[RainbowsParticipant @rainbows]

Bit of both I guess. It is currently my biggest tap so aside from the lathe it might also get used in other applications where a big thread is needed.

Also when I tried to die cut an m16 stud my fairly worn vice jaws wouldn't hold tight enough to grip the smooth round bar. Worked it out by adding 20mm to the length of the workpiece and filing flats for the vice to grip onto. Then once the threading was done I cut off the extra square section of the bar. A pipe vice might have worked as well.

[MadMikeParticipant @madmike]

Having seen a post saying that Tracy Tools only offered up to1 inch BSW I checked again. My memory is still OK, they offer up to 2 inch BSW taps and dies in 10, 12 14, and up to 26 TPI in BSW thread firm.

[MadMikeParticipant @madmike]

Ooooops forgot to add, look at page 5 of their taps and die list.

[bodgeParticipant @bodge]

So now i ( dont?) know what i can use it for. I literally couldn't give the thing away. damn.

Michael W

There`s chap who posts on here, says he`s happy to dispose sooper adepts as ballast for his gate posts maybe he could lose it for you! was a bit of awhile ago now though, maybe he`s had enough S/adepts already! Neil`s not posted any thing of his adept of late, just wondering.

Im with MichealG on this one, in a word No

Though as Neil says can / could use die nut for finishing after screw cutting,…………..b

I have no 2 adept shaper does that qualify entry to the Adept owners club ? …the spell checker cant spell shaper and i thought my spelling was bad !!

Edited By bodge on 10/07/2016 07:36:38

Edited By bodge on 10/07/2016 07:52:29

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