It very well may be a tapered tap that he is using, but because the thickness of the aluminum at this point isnt all that thick, maybe its not able to be "tapered" well. I dont know. I just know that in some places where I try to run my pipe to AN fittings (not on the redrive) they fitting snug up in the tapers... and on the redrive I am pretty sure they bottom out or come close.
 
Dave

Dale Rogers wrote:

Dunno about the particulars, but if Tracy isn't using NPTF 
taps to thread the fitting holes, he might want to consider 
adding that to the specification.

Why?  Because the "F" on the end indicates that the thread 
form is designed to be self-sealing (gas-tight).  

The NPTF taps are only a little higher in price, and they 
save a lot of hassle downstream.

Dale R.
COZY MkIV #1254
 
  

From: David Staten <Dastaten@earthlink.net>
Date: 2005/06/23 Thu AM 07:52:48 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Thread "sealing"

Ok, I dont have my manual in front of me.. so maybe RTFM is the right 
answer..
 
But I am close to putting on my oil fittings "for good" and have noticed 
a few things...
 
On the RWS redrives, I do not know if the female threaded holes (1/4" 
and 1/8") are tapered or not, but it appears that my AN fittings I have 
to thread into the holes on the RWS are able to bottom out. What is the 
appropriate method for ensuring a snug fit and preventing vibration or 
pressure induced flexing/loosening. Likewise, sealing options for other 
threaded ports (not the flared sides of the AN fittings, but the 
pipethreaded end of the fitting).
 
Teflon?  Lock-Tite? Whats the answer? I have heard of anecdotal stories 
of these products causing problems when bits and pieces of them break 
off and lodge someplace.

Dave Staten


    

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