Author Topic: Lathe Die Holder  (Read 691 times)

rsterne

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Lathe Die Holder
« on: December 26, 2018, 12:27:37 PM »
For many years now I have been intending to make some die holders that can be held in a 1/2" Jacob's Chuck or a Lathe Chuck.... Without one, it is pretty difficult to start a die straight on a shaft, particularly a small machine screw thread.... I have a job coming up where I am going to have to thread a 1/8" valve stem with 5-40 threads so that the poppet will be better secured, so I decided today was the day to make a die holder that would fit the assortment of 13/16" OD dies I have for 2-56 through 12-24 threads.... I started with a 2" long piece of 1144 steel, and here is what I ended up with....



The shaft is 1/2" diameter, and 1.2" long, which will allow the shoulder to go right up against the end of the Jacob's Chuck in my tailstock.... and of course it will do the same in the headstock 3-jaw chuck.... The front end is bored 0.817" ID to a depth of 0.260", and there are three holes drilled and tapped for 10-32 setscrews at 45 deg. to each other.... The setscrew in the center hole is 1/4" long and machined to a 90 deg. point to spread the slot in the die, the other two are just 3/16" long 10-32 setscrews.... As with any adjustable die, you can clamp or spread the die to adjust it to give you the proper thread dimensions.... There is a 1/4" through hole for the shaft to pass through....

I think this should work just fine, and make threading small shafts and parts and keeping the thread straight a lot easier.... I plan to make a couple of other holders for larger dies someday....  ::)

Bob
« Last Edit: December 26, 2018, 12:33:36 PM by rsterne »


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Alan

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Re: Lathe Die Holder
« Reply #1 on: December 26, 2018, 12:55:47 PM »
The only words which come to mind, are.... "My Hero".

I looked all over for one of these, after seeing one in an old Popular Science. Surely someone makes these things?
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CraigH

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Re: Lathe Die Holder
« Reply #2 on: December 26, 2018, 04:47:38 PM »
Nice!   Excellent finish.
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rsterne

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Re: Lathe Die Holder
« Reply #3 on: December 26, 2018, 05:14:40 PM »
I think you can buy commercial versions for different size dies....

Bob
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steveoh

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Re: Lathe Die Holder
« Reply #4 on: December 26, 2018, 06:49:15 PM »
Oh I have struggled cutting threads that were straight.
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bnowlin

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Re: Lathe Die Holder
« Reply #5 on: December 27, 2018, 04:29:57 PM »
Very nice Bob.  You have a regular factory up there.  Love it.
Bobn

d_boom

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Re: Lathe Die Holder
« Reply #6 on: February 09, 2019, 08:30:44 AM »
Thanks for the photos and the explanation of dimensions used. Very useful for anyone wanting to make one. 
I often single point larger threads, where the shaft is stiff enough not to deflect, then use an adjustable die to
finish threads to size. - Danny
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rsterne

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Re: Lathe Die Holder
« Reply #7 on: February 09, 2019, 06:37:53 PM »
I do the same.... Last week I single-pointed the 1/2"-20 NF threads on the muzzle of two barrels and then finished them up with a "die nut" (thread chaser)….

Bob
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