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This is the maximum distance that the picker is jogged clear of the bay tab
before the picker is withdrawn from the bay. The picker is jogged back until
the bay end of bay tab is detected, cassette_clear_y is just the max distance
that will be jogged if optical sensor should fail. The purpose is to make sure
that the picker head will pass clear of the shutter.
Note: The inherent latency in the response time of the firmware causes the autoloader
to stop between 18 & 35 mm beyond (aft of) the back edge of the bay tab, rather that
exactly on the back edge as intended.
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