TM 9-4910-641-14&P
OPERATION
vided with machine as standard equipment. To change collets remove hand
screw at back of work head, pull out sleeve and collet. Insert collet, replace
sleeve and hand screw.
Keep collets, cone sleeve and inside of work head clean and dry. A
light film of oil should be applied to cone whenever unit is removed from
spindle. These collets are accurate to 0.001 inch and any dirt or grit will
reduce their accuracy. They grip at each end on actual working surface
of vaIve stem--assuring accuracy between stem and new angle grind.
capacity are available extras
adaptable to work head,
collet. Small spacer furnished with collet is positioned between cone and
hand screw.
SETTING GRINDING ANGLE: To set machine for desired grinding
angle, place stop pin in correct hole on table top to the rear of work head.
With the round side of the pin next to work head, hold work head against
the stop pin and tighten nut using milled end of valve stop pin for wrench.
For 440 angle valves, place stop pin in 4 5 angle hole with flat side of pin
next to work head. This gives -10 reading when flat side of pin flushes
to work head base.
DRESSING WHEEL FACE: Position rocker arm and wheel dresser
attachment on front table stud and lock in position. The diamond holder
is placed on attachment stud over lower cone. Turn on machine and feed
diamond up to wheel slowly. It is best to dress wheel dry because use of
coolant is apt to crack diamond. If wet dressing is desired be sure to open
coolant valve and have coolant flowing before applying diamond to wheel.
Rough dress the wheel by passing the diamond rapidly back and forth
across the wheel using light feed until wheel is true, Finish dress by pass-
ing diamond slowly across wheel several time, without feed the last few
times. Back off diamond from wheel when completed. Strict adherence
to the foregoing procedure will result in a smooth wheel capable of pro-
ducing the finest possible valve face finish. Remove attachment from
machine and prepare to chuck valve.
If excessive carbon on valves to be ground is cleaned off with wire
brush, wheel will not become filled with the soft carbon, eliminating too
frequent wheel dressing.
DRESSING WHEEL SIDE: To dress side of wheel, position dresser
and move table toward wheel until diamond ALMOST touches side of wheel,
It may be necessary to turn diamond holder over so that large counterbore
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