X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m21.mx.aol.com ([64.12.137.2] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2279123 for flyrotary@lancaironline.net; Wed, 22 Aug 2007 18:18:07 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.2; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m21.mx.aol.com (mail_out_v38_r9.2.) id q.c5f.17ef8943 (52829) for ; Wed, 22 Aug 2007 18:17:19 -0400 (EDT) Received: from WEBMAIL-MC10 (webmail-mc10.webmail.aol.com [64.12.170.87]) by cia-m01.mx.aol.com (v119.7) with ESMTP id MAILCIAM015-ce5d46ccb5ef15a; Wed, 22 Aug 2007 18:17:19 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Tap 'em holes was [FlyRotary] Throttle Body Nut Ideas Date: Wed, 22 Aug 2007 18:17:19 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8C9B32156BD28E9_960_14218_WEBMAIL-MC10.sysops.aol.com" X-Mailer: AOL WebMail 29047 Received: from 65.161.241.3 by WEBMAIL-MC10.sysops.aol.com (64.12.170.87) with HTTP (WebMailUI); Wed, 22 Aug 2007 18:17:19 -0400 Message-Id: <8C9B32156BD28E9-960-9DB1@WEBMAIL-MC10.sysops.aol.com> X-AOL-IP: 64.12.170.87 X-Spam-Flag: NO ----------MB_8C9B32156BD28E9_960_14218_WEBMAIL-MC10.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Dale, We have been using these taps for years. You should check in Machinerys Handbook or with the manufacturer for the tap drill size. I always ask for a tap with a air/lube relief groove.?Hand tapping can be tough with the roll tap as these are called. Bill Jepson? -----Original Message----- From: Dale Rogers To: Rotary motors in aircraft Sent: Wed, 22 Aug 2007 12:09 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.? So ... if one wants threads in alumin(i)um, one needs a tool that 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;jsessionid=0000aUcDvp-FmIJrmRkZmUaWieP:-1?productId=27670&langId=-1&storeId=10001&catalogId=10001&parent_category_rn= Rutland Tool # 21238428 Good hunting, Dale R. COZY MkIV #1254 Ernest Christley wrote: Ed Anderson wrote: 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. I've been told by a machinist that tapped holes in aluminum are weak.? Any truth to that? -- Homepage:? http://www.flyrotary.com/ Archive and UnSub:?? http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com. ----------MB_8C9B32156BD28E9_960_14218_WEBMAIL-MC10.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"
Dale,
We have been using these taps for years. You should check in Machinerys Handbook or with the manufacturer for the tap drill size. I always ask for a tap with a air/lube relief groove. Hand tapping can be tough with the roll tap as these are called.
Bill Jepson 


-----Original Message-----
From: Dale Rogers <dale.r@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 22 Aug 2007 12:09 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. 

So ... if one wants threads in alumin(i)um, one needs a tool that
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;jsessionid=0000aUcDvp-FmIJrmRkZmUaWieP:-1?productId=27670&langId=-1&storeId=10001&catalogId=10001&parent_category_rn=

Rutland Tool # 21238428

Good hunting,
Dale R.
COZY MkIV #1254



Ernest Christley wrote:
Ed Anderson wrote:
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.

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

--
Homepage:  http://www.flyrotary.com/
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