X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.25.9.100] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2278100 for flyrotary@lancaironline.net; Wed, 22 Aug 2007 09:56:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-01.southeast.rr.com (8.13.6/8.13.6) with SMTP id l7MDu5h0019560 for ; Wed, 22 Aug 2007 09:56:06 -0400 (EDT) Message-ID: <001301c7e4c4$65bda9c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Tap 'em holes was [FlyRotary] Throttle Body Nut Ideas Date: Wed, 22 Aug 2007 09:57:36 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine ----- Original Message ----- From: "Ernest Christley" To: "Rotary motors in aircraft" Sent: Wednesday, August 22, 2007 8:44 AM Subject: [FlyRotary] Re: Tap 'em holes was [FlyRotary] Throttle Body Nut Ideas > 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. >> >> 1. There is nothing to fall off inside the plenum, no nuts, no bolts or >> no nut plates >> 2. Its a few fractions of an ounce lighter >> 3. You never have to worry about getting onto the back side of the plate >> (looks like you intend to weld it to the plenum tube. >> 4. Two of your nuts are pretty close to the wall of your plenum if that >> bright circle is indeed where it will be placed - can't tell for sure but >> could be interference with the wall of plenum. >> 5. You never have to worry about it again. >> >> Ed >> >> > I've been told by a machinist that tapped holes in aluminum are weak. Any > truth to that? > Well, yes, seeing as how aluminum is weaker that steel, I think that statement makes sense. If it were a thin piece of aluminum I might be concerned, but it looks at least 3/8" perhaps 1/2" thick. Tapped holes to hold on a light throttle body with those size bolts will have no problem what soever. Ed