X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ccerelbas03.cce.hp.com ([161.114.21.106] verified) by logan.com (CommuniGate Pro SMTP 5.1.1) with ESMTPS id 1505923 for flyrotary@lancaironline.net; Thu, 26 Oct 2006 10:25:45 -0400 Received-SPF: none receiver=logan.com; client-ip=161.114.21.106; envelope-from=dale.r@cox.net Received: from mailrelay01.cce.cpqcorp.net (relay.cpqcorp.net [16.47.68.171]) by ccerelbas03.cce.hp.com (Postfix) with ESMTP id 8995234314 for ; Thu, 26 Oct 2006 09:25:13 -0500 (CDT) Received: from [16.83.198.148] (unknown [16.83.198.148]) by mailrelay01.cce.cpqcorp.net (Postfix) with ESMTP id DE65B1582 for ; Thu, 26 Oct 2006 09:25:10 -0500 (CDT) Message-ID: <4540C53E.5070207@cox.net> Date: Thu, 26 Oct 2006 07:25:02 -0700 From: Dale Rogers Reply-To: dale.r@cox.net User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Rotary Roundup References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Steve Brooks wrote:

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 ?

The only "boring bits" I'm familiar with are of two types: the cutting
edge of a boring bar - which, if the feed is correct - produces a
finish as fine as a lathe cut; and a "spade" bit (commonly used for
very hard materials) that might be considered the equivalent of a
two flute reamer, depending on whether the sides have been ground
to cutting edges (really rare!). I wouldn't expect either to produce
the quality of finish required using only a drill press (unless the
operator had a *very* carefully calibrated arm for feeding the quill.)

Dale R.