Metalfab Model DB2 Volumetric Screw Feeder - Manual (Page 2)

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2. Screw rotation must be clockwise when facing the discharge end of
the Feeder.
Operation
After the unit is in place under the hopper and wired, it is ready for
operation. As noted above, A.C. drives must be in motion to change
speed. Units equipped with D.C. drives can have their speed adjusted
at anytime, i.e., with the unit stopped or in operation. The speed dial
provides for setting screw speeds to 1 part in 1000. Speed is
increased by increasing the potentiometer setting.
Sufficient material should be placed in the hopper and the hand
operated controller dial should be set to #2.5 (#250 for D.C. drives).
The unit should be allowed to run for 5 minutes before a 30 second
sample is collected and weighed. It is suggested that 5 or more
samples be taken to assure the Feeder is operating properly. Once the
feed rate is known at setting #2.5, the required rate may then be
obtained by proper speed change. The drive and therefore the feed
rates, are linear, hence, at a setting of #2.5, the Feeder will be
operating at approximately one fourth capacity. Take samples at three
or four settings and a plot graph, setting verses rate. From this graph,
any feed rate may be selected.
WARNING: Keep hands clear of all moving parts. Serious
injury can occur.
Disassembly
Warning: Motor must be electrically locked-out before any
work is performed.
The DB2 Feeder is easily disassembled for cleaning, changing of
screws or maintenance purposes. To remove the screw (Part #1
drawing S-1020):
1. Loosen the set collar on the front bearing (Part #3).
2. Remove bolts on front discharge cover (Part #2) and remove the
cover by pulling it forward until it disengages the screw shaft.
3. Loosen the set screw on the rear bearing (Part #5).
4. Loosen the set screw on the jaw coupling (Part #6) so it will fall
from the screw shaft when the screw is pulled forward.