Sharp 1118H, Operations Manual & Parts List, Page: 21 / 68

19
OUTSIDE CHANGE GEARS
The outside change gears are used to cut threads not provided in the quick-change
gearbox. A set of five gears and a bracket are supplied as optional equipment. These gears,
when set up to the gear chart, Figure 45 will cut 10 threads per inch or 0.25mm pitch
according to set up. If ordered, three of the gears are shipped on the bracket and the other
two are in place on the shafts as shown at “U” (Figure 44) and “W” (Figure 44).
BEFORE SETTING UP CHANGE GEARS, PLACE KNOB “A” (FIGURE
43), IN THE “OUT” POSITION.
Fastened to the tumbler handle bracket within the gear box is round safety bar “X”
(Figure 44), that extends out through a slot in the gearbox plate. This bar is to prevent
applying change gears outside the gearbox until the tumbler handle is placed in the “OUT”
position.
Additional gears are available to cut other threads which are not available through
gearbox.
Lubricate bushings and shafts on change gear bracket with spindle oil each time a
setup is made. If long run threading is involved, lubricate daily.
Figure 45-Change Gear Bracket “Optional”
R
P
A
Figure 44-Threading Gearbox Figure 43-Headstock and Gearbox
X
U
W
A