X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from QMTA02.emeryville.ca.mail.comcast.net ([76.96.30.24] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3458627 for flyrotary@lancaironline.net; Thu, 29 Jan 2009 10:18:14 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.24; envelope-from=wschertz@comcast.net Received: from OMTA02.emeryville.ca.mail.comcast.net ([76.96.30.19]) by QMTA02.emeryville.ca.mail.comcast.net with comcast id 9QHX1b00B0QkzPwA2THeke; Thu, 29 Jan 2009 15:17:38 +0000 Received: from WschertzPC ([71.57.77.95]) by OMTA02.emeryville.ca.mail.comcast.net with comcast id 9THc1b00Q23NHuF8NTHdNh; Thu, 29 Jan 2009 15:17:38 +0000 Message-ID: From: "Bill Schertz" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] reverse engineering Date: Thu, 29 Jan 2009 09:17:30 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0031_01C981F2.69AE9E50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0031_01C981F2.69AE9E50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Kevin, If what you are trying to do is match the holes in the new part = to the Mazda part, I would recommend that you get a set of Transfer = punches. they come in a set covering each increment of hole size, and = you find the one that closely matches the existing hole, position the = parts together, and strike the punch with a hammer. This puts an indent = in the part to be drilled. I got mine at Grizzly.com, search for 'transfer punches' and they have = them in both English and metric sets. Bill Schertz KIS Cruiser #4045 N343BS ----- Original Message -----=20 From: kevin lane=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 28, 2009 11:59 PM Subject: [FlyRotary] reverse engineering I am designing some parts that must fit the drive pulley hub tightly. = my question is, since I've never done this before, involves measuring = the existing pulley. can I assume that measurements are typically even = numbers, and that a hole diameter isn't 49.12mm for instance? I can fit = drill bits thru the bolt holes and drive pins to get accurate = measurements there. I discovered that, indeed, the bolt holes aren't at = 90 degrees, but appear to be at 85 and 180 degrees, which means the = reluctor wheel only fits one way. I located the holes by measuring the = distance between adjacent holes. again, can I assume an offset of an = even 5 degrees? I am using some electronic calipers from harbor = freight. do you find these accurate enough? kevin -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0031_01C981F2.69AE9E50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Kevin, If what you are trying to do is = match the=20 holes in the new part to the Mazda part, I would recommend that you get = a set of=20 Transfer punches. they come in a set covering each increment of hole = size, and=20 you find the one that closely matches the existing hole, position the = parts=20 together, and strike the punch with a hammer. This puts an indent in the = part to=20 be drilled.
 
I got mine at Grizzly.com, search for = 'transfer=20 punches' and they have them in both English and metric = sets.
 
Bill Schertz
KIS Cruiser #4045
N343BS
----- Original Message -----
From:=20 kevin = lane=20
Sent: Wednesday, January 28, = 2009 11:59=20 PM
Subject: [FlyRotary] reverse=20 engineering

I am designing some parts that must = fit the=20 drive pulley hub tightly.  my question is, since I've never done = this=20 before, involves measuring the existing pulley.  can I assume = that=20 measurements are typically even numbers, and that a hole diameter = isn't=20 49.12mm for instance?  I can fit drill bits thru the bolt holes = and drive=20 pins to get accurate measurements there.  I discovered that, = indeed, the=20 bolt holes aren't at 90 degrees, but appear to be at 85 and 180 = degrees, which=20 means the reluctor wheel only fits one way.  I located the holes = by=20 measuring the distance between adjacent holes.  again, can I = assume=20 an offset of an even 5 degrees?  I am using some electronic = calipers from=20 harbor freight.  do you find these accurate=20 enough?      kevin

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Homepage:  http://www.flyrotary.com/
Archive and=20 UnSub:  =20 = http://mail.lancaironline.net:81/lists/flyrotary/List.html
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