Metalfab Metatech MT-X-XXX Series Volumetric Screw Feeder - Manual (Page 4)

Standard Inverter Duty Gearmotor fig B.
The hopper may be equipped with a pneumatically or electrically operated
vibrator if the feed product requires an assist to promote flow. The hopper is
also equipped with a baffle when a vibrator is used. The amount of vibration
should be minimal, just enough to promote flow. The vibrations of the
pneumatic vibrator may be adjusted by changing the P.S.I. setting (pressure
regulator, filter, gauge, etc., by customer), but should not exceed a maximum
pressure of 80 P.S.I. For electric vibrators, the vibrations may be adjusted by
changing the alignment of the centerlines of the eccentric weights, consult the
vibrator manual for proper instructions. In all applications, the vibrator should
be controlled such that it only operates while the feeder is operating. Operation
of the vibrator without an established discharge from the feeder may cause the
material to pack in the trough and/or hopper.
The closer you align the centerlines of the two (2) OUTER weights with the
centerlines of the two (2) INNER weights, you are INCREASING the force. The
further you misalign the referenced centerlines, the more your DECREASE the
force. If the centerlines of all four (4) weights are completely aligned, you will