triple start tap die

This topic has 18 replies, 11 voices, and was last updated 22 April 2015 at 09:11 by JasonB.

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21 April 2015 at 20:05 #17686
capnahab
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@capnahab
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21 April 2015 at 20:05 #187280
capnahab
Participant
@capnahab
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
21 April 2015 at 20:20 #187285
Roderick Jenkins
Participant
@roderickjenkins93242
Sorry, just noticed the triple start!

Rod

Edited By Roderick Jenkins on 21/04/2015 20:22:27
21 April 2015 at 20:22 #187286
JasonB
Moderator
@jasonb
Rod, its a triple start one that he is after, not even Tracy's have them
21 April 2015 at 20:24 #187288
Roderick Jenkins
Participant
@roderickjenkins93242
8 seconds too slow in editing
21 April 2015 at 20:25 #187289
capnahab
Participant
@capnahab
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.
21 April 2015 at 20:30 #187291
Bob Brown 1
Participant
@bobbrown1
This lot make "specials" **LINK** may be worth a telephone call.

Bob
21 April 2015 at 20:49 #187297
Oompa Lumpa
Participant
@oompalumpa34302
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 6×48 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.
21 April 2015 at 22:00 #187301
Ian P
Participant
@ianp
Posted by Oompa Lumpa on 21/04/2015 20:49:34:

I need an 6×48 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 6×48 tap?

Ian
21 April 2015 at 22:12 #187303
duncan webster 1
Participant
@duncanwebster1
why not screw cut it?
21 April 2015 at 22:22 #187305
capnahab
Participant
@capnahab
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.
21 April 2015 at 23:46 #187310
Oompa Lumpa
Participant
@oompalumpa34302
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 6×48 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 6×48 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.
22 April 2015 at 04:21 #187317
I.M. OUTAHERE
Participant
@i-m-outahere
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.
22 April 2015 at 07:16 #187321
Clive Hartland
Participant
@clivehartland94829
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
22 April 2015 at 07:38 #187324
JasonB
Moderator
@jasonb
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 6×48 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 6×48 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
22 April 2015 at 07:59 #187326
Michael Gilligan
Participant
@michaelgilligan61133
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.
22 April 2015 at 08:07 #187328
JasonB
Moderator
@jasonb
Or the more colourful one I tend to use or should that be colorful?

HERE
22 April 2015 at 09:03 #187336
Frank.N Storm
Participant
@frank-nstorm18349
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
22 April 2015 at 09:11 #187339
JasonB
Moderator
@jasonb
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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