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MMD > Archives > September 2015 > 2015.09.02 > 06Prev  Next

Ampico Air Motor Tempo Aperture Plate Drawing
By John A. Tuttle

Hi All,  Douglas Heckrotte hit the nail on the head concerning the
creation of the curve for the 'trumpet' in the slider.  I ended up
getting four different images and I traced each one as explained in a
previous posting.  Then I initially divided the curved section into four
segments and took measurements.  Using those and a French curve (yes,
I've got one..;-)), I 'connected the dots'.  Not being satisfied with
the appearance of the results, I divided the curves in six segments and
took measurements.

Over the course of a week, I arrived at averages that were within a few
thousandths of an inch of each other.  Using those numbers, I drew in
the line segments and then used a neat feature of the eMachineShop
program called 'Simplify', which automatically created a smooth arc.
Then, using their copy/paste/flip feature, I duplicated the arc on the
other side of the trumpet.

Regarding all of the other associated sizes and distances, I used the
same basic technique as I used concerning the arc, i.e., taking
measurements and arriving at averages.  After completing the fourteenth
variation, I was satisfied, and late Monday night I sent the job off to
be manufactured.

I should be getting the parts on Monday or Tuesday this coming week.
They will be selling for $20.00 each.  They are being made out of
1/16-inch thick acetal [e.g. Delrin, Celcon, etc.].

John A Tuttle
Brick, New Jersey, USA

(Message sent Wed 2 Sep 2015, 22:18:42 GMT, from time zone GMT-0700.)

Key Words in Subject:  Air, Ampico, Aperture, Drawing, Motor, Plate, Tempo

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