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 5.2.10) with ESMTP id 3306563 for flyrotary@lancaironline.net; Tue, 18 Nov 2008 18:10:36 -0500 Received: from WRJJRS@aol.com by imo-m25.mx.aol.com (mail_out_v39.1.) id q.cc6.4121c502 (37169) for ; Tue, 18 Nov 2008 18:10:31 -0500 (EST) Received: from smtprly-ma01.mx.aol.com (smtprly-ma01.mx.aol.com [64.12.207.140]) by cia-ma04.mx.aol.com (v121_r4.6) with ESMTP id MAILCIAMA048-5c4749234b5e5c; Tue, 18 Nov 2008 18:10:30 -0500 Received: from webmail-dx01 (webmail-dx01.sim.aol.com [205.188.104.86]) by smtprly-ma01.mx.aol.com (v121_r4.6) with ESMTP id MAILSMTPRLYMA015-5c4749234b5e5c; Tue, 18 Nov 2008 18:10:22 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: bolt depth Date: Tue, 18 Nov 2008 18:10:22 -0500 X-AOL-IP: 66.253.96.220 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_8CB17E9F7B5AE18_1410_1E0_webmail-dx01.sysops.aol.com" X-Mailer: AOL Webmail 39997-STANDARD Received: from 66.253.96.220 by webmail-dx01.sysops.aol.com (205.188.104.86) with HTTP (WebMailUI); Tue, 18 Nov 2008 18:10:22 -0500 Message-Id: <8CB17E9F7A4FDB0-1410-E9@webmail-dx01.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CB17E9F7B5AE18_1410_1E0_webmail-dx01.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Kevin, An additional note: If the thread is in a soft metal, like your aluminum Lyc cases it will be corse (unc) thread. the reason is that the thicker thread root will resist tear-out better in aluminum. Steel has a much higher tensile strength and usually is strongest in a fine (unf) thread. My personal comment on lock washers is that they are nearly worthless. Apparently Lycoming agrees! A properly torqued bolt won't come loose. Be sure to get a good quality torque wrench and USE IT. I recomend a foot pound wrench approx 15-100ft pounds, and an inch pound wrench from 10 or 15-200in pounds. Split washers make an unstable base for your bolt/nut and cuts up your part or fastener. Buy stock in Locktite it works! Use safety wire it works! A GREAT book is Fasteners and Plumbing by Carrol Smith. This book has a ton of great infomation in it. I am on my third copy they tend to walk off. Bill Jepson -----Original Message----- From: wrjjrs@aol.com To: Rotary motors in aircraft Sent: Tue, 18 Nov 2008 1:31 pm Subject: [FlyRotary] Re: bolt depth Kevin, Depending on the thread and bolt size the accepted depth is 1-1/2 to 2 bolt diameters. If it is going on your plane an application of locktite or safety wire is also in order. Bill Jepson -----Original Message----- From: kevin lane To: Rotary motors in aircraft Sent: Tue, 18 Nov 2008 12:40 pm Subject: [FlyRotary] bolt depth I am bolting homemade parts to my block and wanted to know any rule of thumb for how deep a bolt has to be.? does an 8mm bolt need 8mm of thread depth??? a certain number of threads?? are socket head bolts as strong as hex, at least for the intake/exhaust manifolds??? when do I use lock washers??? I always wondered why Lycoming engine case?halves never had lockwashers and used std (not fine)threads.(at least mine came that way)??? kevin?? n3773@comcast.net Instant access to the latest & most popular FREE games while you browse with the Games Toolbar - Download Now! ----------MB_8CB17E9F7B5AE18_1410_1E0_webmail-dx01.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" Kevin, An additional note: If the thread is in a soft metal, like your aluminum Lyc cases it will be corse (unc) thread. the reason is that the thicker thread root will resist tear-out better in aluminum. Steel has a much higher tensile strength and usually is strongest in a fine (unf) thread. My personal comment on lock washers is that they are nearly worthless. Apparently Lycoming agrees! A properly torqued bolt won't come loose. Be sure to get a good quality torque wrench and USE IT. I recomend a foot pound wrench approx 15-100ft pounds, and an inch pound wrench from 10 or 15-200in pounds. Split washers make an unstable base for your bolt/nut and cuts up your part or fastener. Buy stock in Locktite it works! Use safety wire it works! A GREAT book is Fasteners and Plumbing by Carrol Smith. This book has a ton of great infomation in it. I am on my third copy they tend to walk off.
Bill Jepson


-----Original Message-----
From: wrjjrs@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, 18 Nov 2008 1:31 pm
Subject: [FlyRotary] Re: bolt depth

Kevin,
Depending on the thread and bolt size the accepted depth is 1-1/2 to 2 bolt diameters. If it is going on your plane an application of locktite or safety wire is also in order.
Bill Jepson


-----Original Message-----
From: kevin lane <n3773@comcast.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, 18 Nov 2008 12:40 pm
Subject: [FlyRotary] bolt depth

I am bolting homemade parts to my block and wanted to know any rule of thumb for how deep a bolt has to be.  does an 8mm bolt need 8mm of thread depth?   a certain number of threads?  are socket head bolts as strong as hex, at least for the intake/exhaust manifolds?   when do I use lock washers?   I always wondered why Lycoming engine case halves never had lockwashers and used std (not fine)threads.(at least mine came that way)    kevin   n3773@comcast.net
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