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A simple
explanation of how this unit works is as follows:
The bullet or
case to be tested is placed on carbide balls on the units work plate. A drive
rubber on the motor drive shaft is placed on the test piece and the motor drive
speed is adjusted as required to rotate the test piece to be tested for
deviation units on the panel meter scale. Bullet jacket thickness variations,
out of round, boat-tail to body concentricity, and ogive shape and form can be
tested and evaluated by the electronics in the ball plate.
This is shown
as deviation units by the movement of the pointer on the meter scale. The less
the deviation units, the more perfect and balanced the bullet is. Case wall
thickness variations at the head of the case forward of the solid head can also
be tested.