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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 -----
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
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