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5.
WATER FEED.
5.1
Remove the Water Tank Lid and fill the tank to a level so that the water is
approximately 25mm from the tank lip. Refit the Water Tank lid and ensure
that it is secure. Open the valve on the tank outlet and adjust the knurled knob
at the base of the flowmeter to the required flow. (Nominally 110 cc/min).
NOTE: Do not close this valve completely as this can damage the needle.
5.2
A full tank of water will last for approximately one hour. Repeated fillings will
be required for tests exceeding this period.
NOTE: Care must be taken when refilling the water tank during operation.
Spillage could result in an electrical malfunction. If practical, suspend the test
and remove the power before refilling the Water Tank.
6.
CORN EMERY FEED.
6.1
Locate the Corn Emery Feeder in its Mounting Block and align centrally over
the Feed Chute. Plug the flexible feeder lead into its socket on the side of the
Feeder Hopper. Switch on and check the free rotation of the feeder (i.e. the
Drive Pulley is rotating at its nominal speed of 6 rpm
set to operate within the required limits of 20 to 35 gms / min. (Nominally 27
gms / min). The rate of feed can be finely adjusted by setting the Slide Plate
on the front of the hopper, using the 4mm Hexagonal Socket Wrench. Varying
the hopper height using the 4 M5 screws effects coarse adjustment.
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Note: The Corn Feeder Drive Belt rotates at approximately 2½ rpm.
6.2
Switch off the feeder. Fill the hopper with Corn Emery abrasive. (A full hopper
will last approximately one hour). Switch on and check the feed over a short
period of time. Check that the abrasive flows freely down the chute to the
point of contact of the tyred wheel with the specimen.
6.3
Adjust the water flow at a rate sufficient to carry the Corn Emery at a steady
rate down the chute without blocking. Excess water reduces the effective
polishing.
6.4
Reset the Timer to zero before starting the timed test.
6.5
With the machine running, lower the tyred wheel onto the specimens by
rotation of the handwheel situated behind the weight. The machine will stop
automatically upon reaching the Timer pre-set figure.
6.6
Adjust the Road Wheel rotation speed to 320-rpm ±5 with the Speed Control
on the Control Unit. (The speed can be "locked in position" by pressing down
the lever on the speed control potentiometer).
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). The feeder is factory
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