X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1027388 for flyrotary@lancaironline.net; Thu, 30 Jun 2005 14:06:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m25.mx.aol.com (mail_out_v38_r1.7.) id q.1fe.4a7c5f5 (15703) for ; Thu, 30 Jun 2005 14:05:55 -0400 (EDT) Received: from mblk-d37 (mblk-d37.mblk.aol.com [205.188.212.221]) by air-id05.mx.aol.com (v106.2) with ESMTP id MAILINID54-3d5742c434839; Thu, 30 Jun 2005 14:05:55 -0400 Date: Thu, 30 Jun 2005 14:05:55 -0400 Message-Id: <8C74BB57EB4CD7E-8B4-3193@mblk-d37.sysops.aol.com> From: wrjjrs@aol.com References: Received: from 66.127.99.234 by mblk-d37.sysops.aol.com (205.188.212.221) with HTTP (WebMailUI); Thu, 30 Jun 2005 14:05:55 -0400 X-MB-Message-Source: WebUI X-MB-Message-Type: User In-Reply-To: X-Mailer: AOL WebMail 1.1.0.13071 Subject: Re: [FlyRotary] Re: Machining help needed Content-Type: multipart/alternative; boundary="--------MailBlocks_8C74BB57E82BC46_8B4_310E_mblk-d37.sysops.aol.com" MIME-Version: 1.0 To: flyrotary@lancaironline.net X-AOL-IP: 205.188.212.221 ----------MailBlocks_8C74BB57E82BC46_8B4_310E_mblk-d37.sysops.aol.com Content-Type: text/plain; charset="us-ascii" Jerry, Often the problem in boring operations is the chip. Your tool needs to be sharp and usually have at least a very small radius on the cutting tip. The radius helps to blend the machining line and the sharp is obvious. The tool also needs to have enough side clearance to allow the chip to get by or be broken off. The last is often hard in small bores which is why lots of people ream the holes! Bill Jepson -----Original Message----- From: Jerry Hey To: Rotary motors in aircraft Sent: Thu, 30 Jun 2005 12:54:59 -0500 Subject: [FlyRotary] Re: Machining help needed On Thursday, June 30, 2005, at 11:36 AM, Russell Duffy wrote: > I have to disagree with your observation. The boring > tool, by itself will not yield a surface appropriate for > seating the injector o-ring (and easy removal for service). > > > Hi Dale, > > I have to disagree, with your disagreement :-) I used a boring bar, > in a mill to open up the stock fuel rail holes for my MSD injectors. > I've also bored holes in a cast aluminum intake for the bottom end of > the injectors. All holes are sealing just dandy, though I was pretty > paranoid about the fuel rail holes. I must have checked those 100 > times to make sure they weren't leaking, but now I hardly give them a > thought. > > Cheers, > Rusty In this case it depends on the operator. Using the boring bar in the lathe and being very careful on the set up, I could not achieve the polished smooth finish I was hoping for. I am self taught in machining and sometimes come up short. I don't mind having a reamer ground for the purpose. Jerry > > > > ----------MailBlocks_8C74BB57E82BC46_8B4_310E_mblk-d37.sysops.aol.com Content-Type: text/html; charset="us-ascii"
Jerry, Often the problem in boring operations is the chip. Your tool needs to be sharp and usually have at least a very small radius on the cutting tip. The radius helps to blend the machining line and the sharp is obvious. The tool also needs to have enough side clearance to allow the chip to get by or be broken off. The last is often hard in small bores which is why lots of people ream the holes!
Bill Jepson 
 
-----Original Message-----
From: Jerry Hey <jerryhey@earthlink.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 30 Jun 2005 12:54:59 -0500
Subject: [FlyRotary] Re: Machining help needed

On Thursday, June 30, 2005, at 11:36 AM, Russell Duffy wrote: 
 
>    I have to disagree with your observation.  The boring 
> tool, by itself will not yield a surface appropriate for 
> seating the injector o-ring (and easy removal for service).  
> 
>   
> Hi Dale, 
>   
> I have to disagree, with your disagreement :-)   I used a boring bar, > in a mill to open up the stock fuel rail holes for my MSD injectors.  > I've also bored holes in a cast aluminum intake for the bottom end of > the injectors.  All holes are sealing just dandy, though I was pretty > paranoid about the fuel rail holes.  I must have checked those 100 > times to make sure they weren't leaking, but now I hardly give them a > thought.   
>   
> Cheers, 
> Rusty 
 
In this case it depends on the operator. Using the boring bar in the lathe and being very careful on the set up, I could not achieve the polished smooth finish I was hoping for. I am self taught in machining and sometimes come up short. I don't mind having a reamer ground for the purpose. Jerry 
>   
> 
> 
> 
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