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Threading 1/4NPT taps

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VE3LVO(at)rac.ca
Guest

Posted: Mon Apr 24, 2006 11:29 am Post subject: Threading 1/4NPT taps

Cheers,

            As I have said several times, I am a flyer, not a builder by 

trade and occasionally am trapped by this lack of history.

        I have devised a manifold form of fuel system which involves mating 

1/4NPT [9/16"x18tpi pipe thread] with a block of 1"x1"x3" block of 6061-T6 

aluminium, to save space and counteract forward CoG.  Into the threaded 

block goes an AN842-6D fitting, a threaded base onto which is sat a 90deg 

elbow with a tubing nipple for fuel tubing.

            The problem is, I can't seem to find the ideal depth of tap so 

that the fitting is securely threaded and still points in the proper 

direction.

            Is there a trick to tapping these sweethearts so that the AN842 

matches 105in-lbs of torque (or a bit more) to face in the desired 

direction?   Perume sales personnel or tennis pros need not reply - unless 

accompanying documentation qualifies........



help

Ferg Kyle

Europa A064 914 Classic

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rparigor(at)suffolk.lib.n
Guest

Posted: Mon Apr 24, 2006 11:58 am Post subject: Threading 1/4NPT taps

Hello Fergus



"Is there a trick to tapping these sweethearts so that the AN842 

 	  Quote: 	
		   matches 105in-lbs of torque (or a bit more) to face in the desired 

 direction?"


	


A few thinks I try on pipe threads:

Try a few pieces of hardware, sometimes where the thread starts is not the

same.

You can fill threads with Redux and not worry bout tightening (redux is

fuel resistant as long as fully cured

You can run a tap in a bit further, a little bit at a time, go to my

favorite company www.mcmaster.com for info about taps, you can buy from

them with a CC 24/7



Ron Parigoris

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