[Amps] What is it called?-Taps

[Will Matney]

Peter,

Below is a couple of links for carbide, TIN, and cobalt tipped taps. I
would say they ship to the UK with no problems. OSG may have a
distributor there also.

http://www.discount-tools.com/michpictorial.htm

http://www.osgtool.com/catalogtap.asp?TapType=Straight%20Flute

Will



On Sun, 23 Jan 2005 13:52:34 -0500, Will Matney <craxd1 at ezwv.com> wrote:

> On Sun, 23 Jan 2005 13:02:11 -0500, <G3rzp at aol.com> wrote:
>
>> Will said:
>>
>> "My guess is because 4-40 screws have more holding power than a 4-36  
>> screw
>> does. This is due to more threads in the thickness of whatever it's
>> screwed into, either tapped material or a nut. Fine threads are always
>> used in places where more holding power is needed in a thin section.
>> Coarse threads are for thicker sections."
>>
>>
>> This is true up to a point. It's generally reckoned that if you have  
>> three threads engaged, that will give sufficient strength in most  
>> materials. However, softer materials benefit from using a coarse  
>> thread, because although the core and overall diameters are the same,  
>> there's more meat in each thread.
>
> Correct, fine threads are for metallic uses like steel and aluminum  
> (tapped or with a nut). Deep, coarse threads are used for wood,  
> fibergalss, and composite materials like the insualtion board in  
> mention. That is if it is to be tapped and used without a nut. But if a  
> nut is used, the unified thread system is then used with either coarse  
> or fine threads. Some of the other threads like Buttrus and Acme are  
> used for linear motion or in jacks, etc.
>
>
> All of which is why I tend to use Unified
>> coarse threads (or even BSW!)in places where I'm using soft materials  
>> like aluminium, teflon, tufnol, polythene and even fibreglass. The last  
>> is very rough on tools, blunting them very rapidly, and carbide tipped  
>> tools are desirable. However, I haven't seen any carbide taps yet!!!
>
>
> We have carbide taps here and others with a TIN (Titanium Nitride)  
> coating. Just that carbide and TIN costs more than a HSS one. Carbide  
> can be bad to break off to so they have to be used with that in mind.
>
>>
>> One point worth remembering is that plain carbon steel is harder than  
>> HSS (High Speed Steel) at low temperatures. HSS is used extensively  
>> where speed of metal removal is important, as in industrial machining,  
>> but for a lot of the stuff we do in home brewing, it's not worthwhile -  
>> certainly for taps and dies which are only used in hand tools.
>
> Generally most tool steels in the rough are soft or as annealed. After  
> they are shaped into a tool they are then hardened before they are  
> ground. There's two types available here, water and oil hardening. HHS  
> blanks (like drill rod) though are soft and not worth a quarter if not  
> hardened. There are pre-hardened HSS blanks for boring bars and for use  
> in fly cutters though. They are already shaped and made to be ground  
> away as they are used up.
>
>
>>
>>
>> 73
>>
>>
>> Peter  W6/G3RZP (where it's warm and sunny, for you guys in the mid  
>> west and on the east coast!)
>>
>>
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>
> Will
>



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