Metric Threads Using Outside Change Gears - Sharp 1118H Operations Manual & Parts List

Metric Threads Using Outside Chang Gears
1. Turn disconnect switch "OFF".
2. On metric side of change gear bracket "P" (Figure 56) mount "Idler Gear" "R" (Figure 56).
Do not tighten bolt "S" fully.
3. Loosen knob "B" (Figure 52), open gearbox door and remove 127 tooth gear "T" (Figure
54).
4. Mount change gear bracket assembly, Figure 56, on pivot post "V" (Figure 57), Do not
tighten bracket bolt "U" (Figure 55) fully.
5. Remove "First Gear" "U" (Figure 55), and replace bolt. Do not misplace key.
6. Mount "First Gear on Screw" "T" (Figure 57).
7. If thread chart specifies number of teeth in "Tumbler Gear" to be other than 22 teeth,
remove gear "Y" (Figure 57) and replace with specified gear.
8. Adjust "Idler Gear" "X" (Figure 57) with 0.003"-0.004" backlash between it and "First
Gear on Screw" "T" (Figure 57). Use plastic shim stock to help determine backlash.
Tighten bolt "W" (Figure 57).
9. Pivot bracket to obtain 0.003"-0.004" backlash between "Idler gear" "X" (Figure 57) and
"Tumbler Gear" "Y" (Figure 57). Tighten bracket bolt "J" (Figure 57).
10. Make certain key is in place and remount 127 tooth gear "A" (Figure 58). Tighten bolt "Z"
(Figure 58).
11. Make certain all gears are properly meshed and all bolts tightened.
12. Close gearbox door, tighten knob "B" (Figure 52), and turn selector knob "C" (Figure 52)
to position specified on chart.
13. Turn Inch/Metric knob "D" (Figure 52) to "Metric".
14. Turn Feed/Thread knob "E" (Figure 52) to "Thread".
15. Follow same procedures for setting carriage stop, lead screw nut and compound slide
as when cutting threads from the gearbox. Use of carriage control lever "G" (Figure 52),
and quick-acting handle "P" (Figure 53), will also be the same as when cutting threads
from the gearbox.
16. Observe same operational cautions as when cutting threads from gearbox.
NOTE： ： ： ： (a) 50 tooth gear "S" (Figure 54), and 127 tooth gear "T" (Figure
54) must be remounted without bracket to obtain metric
thread pitches through gearbox.
(b) When disassembling setup, remount 22 tooth "Tumbler
Gear" "W" (Figure 55), and 22 tooth "First Gear" "U"
(Figure55).
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