Sharp SH-920 Instruction Manual page 52

(I) FOR AD3 AUTO DOWN FEED OPERATION
The special arrangement for AD3 auto down feed includes an auto down feed
unit mounted to the shaft of elevating mechanism and two counters (one for
down feed, the other for spark out) to be built-in at the right side of control panel.
There are six increments of feed values, namely 0.005,0.010,0.015, 0.020,0.025
and 0.030mm,which can be selected on the dial regulator C of the auto down
feed unit at your will (see the picture below).
(The function of dial regulator D is replaced by the counters PC111 and PC112 in
control panel, it will not be in use here.)
FOR SURFACE GRINDING + AUTO DOWN FEED.
1.
1.1 Turn selector switch SA111 to right for surface grinding.
1.2 Select the required down feed increment on the dial regulator C of auto
down feed unit AD3 and set the number of down feed increments on the
lower portion of PC111 counter (the upper portion of counter shows the
actual number of cross slide passes actuated).
1.3 Set the number of spark-out passes required on PC112 counter.
1.4 Press the power button SB1 "ON" for power (usually press the power button
for 2-3 seconds is required and then the hand can be released).
1.5 Switch "ON" the hydraulic pump switch SA2 (hydraulic table drive).
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