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the outside of the screen in to the edge of the flight; then subtract the thickness of
the wedgewire (generally either 0.250" or 0.375") from the measured depth in order
to calculate the clearance.
In the case of perforated screen installations, a depth gauge can be used to
measure the screw-to-screen clearance. This is done by first finding an area
where the screw flight is next to the screen; poking a straightened paper clip
through the screen is handy for this purpose. The depth from the outside of the
screen to the edge of the flight is measured, and then the thickness of the screen is
subtracted from that measurement. [3/32" perf is 0.075" thick; 0.050" perf is 0.050
thick; 1/32" perf is 0.024" thick; 0.023" perf is 0.015" thick; 3/8" perf back up screen
is 0.120" thick.]
If a screw rubs against the screen in a given area, it may be best to grind some off
the OD of the screw. Prussian Blue can be useful in finding the spot that is
rubbing.
WEDGEWIRE DEPTH GAGE PERFORATED DEPTH GAGE
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