X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-05.southeast.rr.com ([24.25.9.104] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2278967 for flyrotary@lancaironline.net; Wed, 22 Aug 2007 16:39:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.104; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-05.southeast.rr.com (8.13.6/8.13.6) with SMTP id l7MKcsk2025570 for ; Wed, 22 Aug 2007 16:38:55 -0400 (EDT) Message-ID: <000401c7e4fc$ac2c89c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Tap 'em holes was [FlyRotary] Throttle Body Nut Ideas Date: Wed, 22 Aug 2007 16:40:26 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7E4DB.24B6D0C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7E4DB.24B6D0C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Now, that is interesting. Didn't know of the existence of such a "tap". = Thanks for pointing it out. Ed ----- Original Message -----=20 From: Dale Rogers=20 To: Rotary motors in aircraft=20 Sent: Wednesday, August 22, 2007 3:09 PM Subject: [FlyRotary] Re: Tap 'em holes was [FlyRotary] Throttle Body = Nut Ideas This machinist says: "Why would you want to *do* that? Strictly speaking, cut threads - what you get from conventional taps - are weaker than swaged threads, such as the rolled threads one usually = finds on AN class fastener. =20 So ... if one wants threads in alumin(i)um, one needs a tool that=20 displaces the metal, rather than cutting it. Eureka! Such a tool does = exist - the "fluteless thread forming tap" E.g.: = http://www.shoprutlandtool.com/webapp/wcs/stores/servlet/ProductDisplay;j= sessionid=3D0000aUcDvp-FmIJrmRkZmUaWieP:-1?productId=3D27670&langId=3D-1&= storeId=3D10001&catalogId=3D10001&parent_category_rn=3D Rutland Tool # 21238428=20 Good hunting, Dale R. COZY MkIV #1254 Ernest Christley wrote:=20 Ed Anderson wrote:=20 Scott, I think the best answer is to simply tap those bolt holes = for the thread size of your bolts. This does a number of things.=20 I've been told by a machinist that tapped holes in aluminum are = weak. Any truth to that?=20 --=20 Homepage: http://www.flyrotary.com/=20 Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html=20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0001_01C7E4DB.24B6D0C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Now, that is interesting.  = Didn't know=20 of the existence of such a "tap".  Thanks for pointing it = out.
 
Ed
----- Original Message -----
From:=20 Dale = Rogers
Sent: Wednesday, August 22, = 2007 3:09=20 PM
Subject: [FlyRotary] Re: Tap = 'em holes=20 was [FlyRotary] Throttle Body Nut Ideas

This machinist says:  "Why would you want to *do*=20 that?

Strictly speaking, cut threads - what you get from = conventional=20 taps -
are weaker than swaged threads, such as the rolled threads = one=20 usually
finds on AN class fastener. 

So ... if one = wants=20 threads in alumin(i)um, one needs a tool that
displaces the metal, = rather=20 than cutting it.  Eureka! Such a tool does
exist - the = "fluteless=20 thread forming tap"   E.g.:

http://www.shoprutlandtool.com/webapp/wcs/stores/servlet/ProductD= isplay;jsessionid=3D0000aUcDvp-FmIJrmRkZmUaWieP:-1?productId=3D27670&= langId=3D-1&storeId=3D10001&catalogId=3D10001&parent_category= _rn=3D

Rutland=20 Tool # 21238428

Good hunting,
Dale R.
COZY MkIV=20 #1254



Ernest Christley wrote:=20
Ed = Anderson wrote:=20
Scott,  I think the best answer is to = simply=20 tap those bolt holes for the thread size of your bolts.  This = does a=20 number of things.

I've been told by a = machinist that=20 tapped holes in aluminum are weak.  Any truth to that? =

--=20
Homepage:  http://www.flyrotary.com/ =
Archive=20 and UnSub:   http:= //mail.lancaironline.net:81/lists/flyrotary/List.html=20 


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