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Date: Thu, 29 Jan 2009 04:55:08 -0800
Message-ID: <1ab24f410901290455yde0c277r63245d770a4cad7f@mail.gmail.com>
Subject: Reverse engineering
From: Lynn Hanover <lehanover@gmail.com>
To: flyrotary@lancaironline.net
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*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
 ------------------------------


Keven,
The calipers are fine.

I am waiting for the other shoe to fall.....................

What are you designing?

Lynn E. Hanover
From the Southern
Command in Zephyrhills
Florida

Clear and 73 today.

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<div style=3D"FONT: 10pt arial"><b>Sent:</b> Thursday, January 29, 2009 3:5=
9 PM</div>
<div style=3D"FONT: 10pt arial"><b>Subject:</b> [FlyRotary] reverse enginee=
ring</div>
<div><br></div>
<div><font face=3D"Comic Sans MS">I am designing some parts that must fit t=
he drive pulley hub tightly.&nbsp; my question is, since I&#39;ve never don=
e this before, involves measuring the existing pulley.&nbsp; can I assume t=
hat measurements are typically even numbers, and that a hole diameter isn&#=
39;t 49.12mm for instance?&nbsp; I can fit drill bits thru the bolt holes a=
nd drive pins to get accurate measurements there.&nbsp; I discovered that, =
indeed, the bolt holes aren&#39;t at 90 degrees, but appear to be at 85 and=
 180 degrees, which means the reluctor wheel only fits one way.&nbsp; I loc=
ated the holes by measuring the distance&nbsp;between adjacent holes.&nbsp;=
 again, can I assume an offset of an even 5 degrees?&nbsp; I am using some =
electronic calipers from harbor freight.&nbsp; do you find these accurate e=
nough?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font></div>

<div><font face=3D"Comic Sans MS"></font>&nbsp;</div>
<div><font face=3D"Comic Sans MS">&nbsp;kevin</font></div>
<div>
<hr>
</div>
<p>&nbsp;</p>
<div>Keven,</div>
<div>The calipers are fine.</div>
<div>&nbsp;</div>
<div>I am waiting for the other shoe to fall.....................</div>
<div>&nbsp;</div>
<div>What are you designing?</div>
<div>&nbsp;</div>
<div>Lynn E. Hanover</div>
<div>From the Southern </div>
<div>Command in Zephyrhills</div>
<div>Florida </div>
<div>&nbsp;</div>
<div>Clear and 73 today.</div>

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