X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail12.syd.optusnet.com.au ([211.29.132.193] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTPS id 3458206 for flyrotary@lancaironline.net; Thu, 29 Jan 2009 04:17:56 -0500 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.193; envelope-from=lendich@optusnet.com.au Received: from acer6e40e97492 (d58-108-104-247.dsl.nsw.optusnet.com.au [58.108.104.247]) by mail12.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id n0T9HCtg020506 for ; Thu, 29 Jan 2009 20:17:14 +1100 Message-ID: <91D012B6BAF54795ACEA5B9403B30EB0@acer6e40e97492> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] reverse engineering Date: Thu, 29 Jan 2009 19:17:12 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006A_01C98246.30014140" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_006A_01C98246.30014140 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Kevin, I just measured a 12A shaft and the skinny end is exactly 30mm using my = digital calipers (their good) the ID of the pully varies from 29.88mm to = 29.92mm, a tight fit. George (down under) ----- Original Message -----=20 From: kevin lane=20 To: Rotary motors in aircraft=20 Sent: Thursday, January 29, 2009 3:59 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_006A_01C98246.30014140 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Kevin,
I just measured a 12A shaft and the = skinny end is=20 exactly 30mm using my digital calipers (their good) the ID of the pully = varies=20 from 29.88mm to 29.92mm, a tight fit.
George (down under)
----- Original Message -----
From:=20 kevin = lane=20
Sent: Thursday, January 29, = 2009 3:59=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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