X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.233] verified) by logan.com (CommuniGate Pro SMTP 5.1.1) with ESMTP id 1505729 for flyrotary@lancaironline.net; Thu, 26 Oct 2006 08:49:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.233; envelope-from=cozy4pilot@gmail.com Received: by wx-out-0506.google.com with SMTP id i29so414440wxd for ; Thu, 26 Oct 2006 05:49:15 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:in-reply-to:x-mimeole:importance; b=V+Pis3eXkvomhxyvvnAebLA1Wo8dDt8MWdCSOfcvMEBQwpooizJ+2JFrFVNPJ77fAV5JhDt7PsXz0TOzehXEDhrKEeOCsFZhsf4wo1w1na/CCGBXTCyJ+ORBPSu/TMUEoa9e+bRYbewdJzOczu6YHJGeBOYbszC9CprRlAVfpRY= Received: by 10.90.32.19 with SMTP id f19mr1210265agf; Thu, 26 Oct 2006 05:49:15 -0700 (PDT) Return-Path: Received: from stevehome ( [76.0.154.114]) by mx.google.com with ESMTP id 8sm519695wra.2006.10.26.05.49.13; Thu, 26 Oct 2006 05:49:14 -0700 (PDT) From: "Steve Brooks" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Rotary Roundup Date: Thu, 26 Oct 2006 08:50:41 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01D3_01C6F8DB.D0FEE5D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1807 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_01D3_01C6F8DB.D0FEE5D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Dale or Bill, I was told that a boring bit would yeild a smooth bore. Is that the same as a reamer, or is it different ? Steve Brooks -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Dale Rogers Sent: Wednesday, October 25, 2006 11:40 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Rotary Roundup What Bill said. Plus, in the unlikely event that you can't get a drill bit in the range of .002 - .005" less than your reamer size, it's okay to drill smaller. I've reamed holes that were .010" smaller than finished size with no apparent degradation in finish, but the tool life certainly suffered. OTOH, I would only expect that to be a problem if the tool was expected to ream hundreds of holes. Dale R. wrjjrs@aol.com wrote: For the mechanical engineering comment of the day; Most o-ring seals REQUIRE a 32 microinch finish. This will NOT happen with a drill. For your injector o-rings you are sealing gasoline. (obviously) No halfway measures here! You simply MUST have a totally leak-free seal. Get the correct reamer. They are easily available in metric sizes. For the best finish leave .002-.005 in. of material when drilling. A 32 microinch isn't mirror-like, rather it is flaw free. (no scratches at all) Usually a shiny surface. Bill Jepson -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_01D3_01C6F8DB.D0FEE5D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Dale=20 or Bill,

I was=20 told that a boring bit would yeild a smooth bore. Is that the same = as a=20 reamer, or is it different ?

Steve=20 Brooks

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Dale=20 Rogers
Sent: Wednesday, October 25, 2006 11:40 = AM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Re: Rotary=20 Roundup

What Bill said. Plus, in the = unlikely event=20 that you can't get a drill bit
in the range of .002 - .005" less = than your=20 reamer size, it's okay to
drill smaller. I've reamed holes = that were=20 .010" smaller than finished
size with no apparent degradation in = finish,=20 but the tool life certainly
suffered. OTOH, I would only = expect that=20 to be a problem if the
tool was expected to ream hundreds of=20 holes.

Dale R.

wrjjrs@aol.com wrote:=20

For the mechanical engineering comment of the day; Most = o-ring=20 seals REQUIRE a 32 microinch finish. This will NOT happen with = a drill.=20 For your injector o-rings you are sealing gasoline. (obviously) = No=20 halfway measures here! You simply MUST have a totally leak-free = seal. Get=20 the correct reamer. They are easily available in metric sizes. For = the best=20 finish leave .002-.005 in. of material when drilling. A 32 = microinch=20 isn't mirror-like, rather it is flaw free. (no scratches at=20 all) Usually a shiny surface.

Bill Jepson
--

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

Archive and UnSub:   =
http://mail.lancaironline.net/lists/flyrotary/

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