Sharp 1118H Operations Manual & Parts List page 26

HOW TO APPLY AND REMOVE SPINDLE NOSE TOOLING
Fig 59
The taper nose spindle construction is time-proven for accuracy, durability and fast, easy
application and removal of spindle nose tooling. The taper holds and aligns the tooling
with extreme accuracy. The precision ground slow taper holds and aligns all
Tooling. The pin in all headstock spindle nose tooling engages the bayonet slot "A"
To draw the attachment securely on the taper. Once securely drawn up, the Spindle nose
attachment is actually driven by the locking action of the tapered surface.
Note: Before applying any item of tooling to the spindle nose wipe the spindle nose and
attachment mating section clean.
To apply the step chuck closer, for example, align key "D", Fig 60, with bayonet slot and
slide drive plate on spindle nose. When it is back as far as it will go turn the chuck closer
clockwise to lock in place. Final tightening should be done with a standard pin type spanner
wrench.
To remove the step chuck closer, turn counterclockwise with spanner wrench to loosen.
Continue to turn unit key "D" then remove from spindle by sliding to right off end of spindle.
CAUTION :
1. To obtain accurate results from precision spindle nose attachment always be sure the
spindle nose and mating section in attachment are clean before they are assembled
together and make certain both spindle nose and tooling tapers are absolutely clean.
2. Don't remove key "D" to remove spindle nose tooling. It's the slow way and will interfere
with future accurate operation of the attachment.
3. Rotate tooling in opposite direction of intended spindle rotation.
a. Spindle forward--rotate tooling clockwise to lock.
b. Spindle reverse—rotate tooling counterclockwise to lock.
Spindle collet Key
The spindle collet Key "B", Fig 59, is threaded into the spindle and can removed and
Replaced, in the event of wear or damage, without removing the headstock, spindle or
spindle bearings. Use hexagon pin wrench to remove lock screw; then remove collet key
screw with same hexagon pin wrench.
Fig60