X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m14.mx.aol.com ([64.12.138.204] verified) by logan.com (CommuniGate Pro SMTP 5.1.1) with ESMTP id 1505950 for flyrotary@lancaironline.net; Thu, 26 Oct 2006 10:33:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.204; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m14.mx.aol.com (mail_out_v38_r7.6.) id q.3f7.c604449 (52367) for ; Thu, 26 Oct 2006 10:32:49 -0400 (EDT) Received: from FWM-M01 (fwm-m01.webmail.aol.com [64.12.168.65]) by ciaaol-r05.mx.aol.com (v113.6) with ESMTP id MAILCIAAOLR059-cc8f4540c711260; Thu, 26 Oct 2006 10:32:49 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Rotary Roundup Date: Thu, 26 Oct 2006 10:32:49 -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_8C8C722BF67FE5D_B8C_73E0_FWM-M01.sysops.aol.com" X-Mailer: AOL WebMail 20836 Received: from 65.161.241.3 by FWM-M01.sysops.aol.com (64.12.168.65) with HTTP (WebMailUI); Thu, 26 Oct 2006 10:32:49 -0400 Message-Id: <8C8C722BF67FE5D-B8C-3D61@FWM-M01.sysops.aol.com> X-AOL-IP: 64.12.168.65 X-Spam-Flag: NO ----------MB_8C8C722BF67FE5D_B8C_73E0_FWM-M01.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Steve, Reaming will usually produce a better finish than boring. Carefull boring CAN produce a good finish but it is much slower. Bill Jepson -----Original Message----- From: cozy4pilot@gmail.com To: flyrotary@lancaironline.net Sent: Thu, 26 Oct 2006 5:50 AM Subject: [FlyRotary] Re: Rotary Roundup 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/ ________________________________________________________________________ Check out the new AOL. Most comprehensive set of free safety and security tools, free access to millions of high-quality videos from across the web, free AOL Mail and more. ----------MB_8C8C722BF67FE5D_B8C_73E0_FWM-M01.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"

Steve,

Reaming will usually produce a better finish than boring. Carefull boring CAN produce a good finish but it is much slower.

Bill Jepson

-----Original Message-----
From: cozy4pilot@gmail.com
To: flyrotary@lancaironline.net
Sent: Thu, 26 Oct 2006 5:50 AM
Subject: [FlyRotary] Re: Rotary Roundup

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/

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