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Posted by Grant Erwin on March 23, 2006, 6:44 pm
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I have threaded internal NPT threads both on straight and on tapered holes. You
remove less metal with a hole that is tapered, so you wear your tap less and
also it's easier to turn the tap. But on 16mm aluminum (britspelled "-ium") it
wouldn't be that different. If I were doing this, I'd use kerosene for cutting
fluid.
GWE
Randy Replogle wrote:
> On Thu, 23 Mar 2006 22:34:55 +1100, "Simon"
>
>
>>Hi, I'm cutting a 1 1/4 NPT thread in some 16mm thick aluminium. My tapping
>>chart says 37.5mm hole, I'm wondering if I should use a tapered reamer on
>>the hole first? Or should I just cut the thread in the straight hole?
>>
>>thanks
>>
>>Simon
>>
>>
>
>
> They tell me that there are tapered reamers for this but I've never
> used one.
> Randy Replogle
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