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triple start tap die

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capnahab21/04/2015 20:05:29
182 forum posts
64 photos

Does anyone know where to purchase specialist taps ?.

I need a triple metric 12mm x 0.75 , - its for a pen top. The specialist pen turner suppliers in the US but can't find anyone in the UK.

Edited By capnahab on 21/04/2015 20:23:22

Roderick Jenkins21/04/2015 20:20:16
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2138 forum posts
586 photos

Sorry, just noticed the triple start!

Rod

Edited By Roderick Jenkins on 21/04/2015 20:22:27

JasonB21/04/2015 20:22:19
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Rod, its a triple start one that he is after, not even Tracy's have them

Roderick Jenkins21/04/2015 20:24:01
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8 seconds too slow in editingblush

capnahab21/04/2015 20:25:04
182 forum posts
64 photos

sorry , my fault , should have put it in body, have done so now. Some of the penturners forms have had group buys for a specialist order but not at the mo.

Bob Brown 121/04/2015 20:30:05
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1021 forum posts
127 photos

This lot make "specials" **LINK** may be worth a telephone call.

Bob

Oompa Lumpa21/04/2015 20:49:34
888 forum posts
36 photos
Posted by Bob Brown 1 on 21/04/2015 20:30:05:

This lot make "specials" **LINK** may be worth a telephone call.

Bob

A really nice, genuine chap. But kept me on the 'phone for twenty minutes chatting and sometimes this can be frustrating. I emailed him last week but I don't think he "does" email very well.

I need an 6x48 tap and this is an arse of a thread. I can get them in the US but one tap works out at twenty quid by the time it gets here So I will just take a chance he is busy too tomorrow

graham.

Ian P21/04/2015 22:00:56
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2552 forum posts
113 photos
Posted by Oompa Lumpa on 21/04/2015 20:49:34:

I need an 6x48 tap and this is an arse of a thread. I can get them in the US but one tap works out at twenty quid by the time it gets here So I will just take a chance he is busy too tomorrow

graham.

Can I be the first to ask, what is a 6x48 tap?

Ian

duncan webster21/04/2015 22:12:04
3710 forum posts
69 photos

why not screw cut it?

capnahab21/04/2015 22:22:02
182 forum posts
64 photos

Because I am not good enough at cutting an internal triple start m12 x 0.75 thread in a blind hole ( without wrecking the work piece) in which I have invested some time.

Oompa Lumpa21/04/2015 23:46:43
888 forum posts
36 photos
Posted by Ian Phillips on 21/04/2015 22:00:56:
Posted by Oompa Lumpa on 21/04/2015 20:49:34:

I need an 6x48 tap and this is an arse of a thread. I can get them in the US but one tap works out at twenty quid by the time it gets here So I will just take a chance he is busy too tomorrow

graham.

Can I be the first to ask, what is a 6x48 tap?

Ian

Ah, yes. I was confused with this too the first time I saw it. The 6 refers to wire gauge and of course it is 48 TPI.
Or so it was explained to me.

graham.

I.M. OUTAHERE22/04/2015 04:21:37
1468 forum posts
3 photos

Depending on what material you are cutting i wonder if you could make your own from silver steel ?

Then use that home made tap to make a die for the male thread ?

Just a thought.

Clive Hartland22/04/2015 07:16:24
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2759 forum posts
40 photos

I use these type of 3 start taps on eyepiece threads and they are mostly an adjustable type of tap with a screw down the center to allow easy entry into existing threads. They are quite delicate to adjust and are very expensive from our Leica tooling section in Switzerland. I have cut one but as a solid and not adjustable and it worked fine.

Clive

JasonB22/04/2015 07:38:44
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Posted by Ian Phillips on 21/04/2015 22:00:56:
Posted by Oompa Lumpa on 21/04/2015 20:49:34:

I need an 6x48 tap and this is an arse of a thread. I can get them in the US but one tap works out at twenty quid by the time it gets here So I will just take a chance he is busy too tomorrow

graham.

Can I be the first to ask, what is a 6x48 tap?

Ian

As said in the US for threads below 1/4" dia they use a number system similar but not the same as our swg as the numbers go in the opposite direction eg a low number is larger dia eg 10=0.190" , 6= 0.138" , 0= 0.060".

Typically used for UNC, UNF and UNEF and UNS thread forms.

The way to write it to save confusion is 6-48 or #6-48

J

Edited By JasonB on 22/04/2015 07:40:33

Michael Gilligan22/04/2015 07:59:11
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Posted by JasonB on 22/04/2015 07:38:44:

As said in the US for threads below 1/4" dia they use a number system

.

Useful tabulation, here

MichaelG.

JasonB22/04/2015 08:07:45
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Or the more colourful one I tend to use or should that be colorful?

HERE

Frank.N Storm22/04/2015 09:03:06
48 forum posts
1 photos

So Mr. Capnahab wants to cut a internal 12 mm thread and for this needs a #6 tap of 0.138" ? (= 3.43 mm!).

Somehow these numbers don't come out even...

Regards, Frank

JasonB22/04/2015 09:11:48
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No Capnahab wants a tripe start M12x0.75 which can be bought from the US, Graham uses 6-48 which also come from the US and thats the common link.

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