----- Original Message -----

From: kevin lane

To: Rotary motors in aircraft

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

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