I.) Belt Adjustment; J.) Collet Closer-Removal; K.) Collet Closer-Replacement - Sharp 1118H Operations Manual & Parts List

I.) BELT ADJUSTMENT

Run spindle at approximately 1000 rpm. Move lever "G" (Figure 18) to center "STOP"
position and let the spindle coast to a stop. This is done to equalize belt tension. Loosen
lock nut "N" (Figure 19) 19mm wrench. Turn adjusting screw "P" (Figure19) 6mm socket
head wrench clockwise to tighten belts. Stop machine and check belt tension, there should
be approx. 25.4mm (1") of play in belt.
Figure 18-Control Speed and Direction
J.) COLLET CLOSER REMOVAL
Running the machine with the collet closer and not having a collet locked in place will
damage the collet closer. Remove the collet closer when using chucks, face plates, or
spindle nose type fixtures. The collect closer should be removed often for cleaning to
prevent loading of chips between collet closer tube and inside of spindle at rear and collet
threads. Removal method is：Pull out pin"L" (Figure 20). Slide draw tube out of the spindle.
Do not turn the adjusting nut "N" (Figure 20). It is keyed to the spindle. To remove slide it off
the end of the spindle. Do not remove collet closer by removing screw "S" (Figure 20), this
screw has been adjusted at the factory for proper operation of the collet closer.
K.) COLLET CLOSER REPLACEMENT
Before replacement of the closer, clean inside of the headstock spindle and outside
diameter at rear of spindle where Adjusting Nut "N" (Figure 20) is located. Apply a film of
light oil on rear of spindle Do not force Adjusting Nut "N" (Figure 20) on spindle. If Adjusting
Nut "N" (Figure 20) fits to tight, remove and check for burrs or scratches, then replace.
Clean collet closer tube inside and out apply a film of light oil on slip surface "T" (Figure 20)
of the collet closer tube, replace collet loser and insert Link Pin "L" (Figure 20).
G
S
Figure 20-Collet Closer Removal
Figure 19-Belt Adjustment
L
N
T
9
N
P