"Morgans" wrote in message
...
How does the notch help in telling the rotational position?
--
Jim in NC
Without giving too much away...
The notch depth is more significant than any vibration. If using a
proximity measurment, it is easy to determine when the notch occurs.
The notch is aligned with a known position (engineer inserts notch when
pistons/crank is in known position). This gives a phase reference. You can
compare where in the cycle a disturbance (knock, rub, etc) occurs with
relation to the notch. On recip applications, often a multi-tooth wheel is
used in addition to a phase reference for more accuracy.
Adam
N7966L
Beech Super III
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