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Model G0773 (Mfd. Since 12/14)
-47-
End-Gear Configuration Example
Follow the example below to better understand
how to configure the end gears for inch threading.
Tools Needed Qty
Hex Wrench 5mm .............................................. 1
Hex Wrench 6mm .............................................. 1
Hex Wrench 8mm .............................................. 1
Open-End Wrench 19mm .................................. 1
To configure end gears for threading 72 TPI:
1. Locate 72 on the metric thread chart, then
locate the 30 "G" position gear (see Figure
69), which corresponds to 1.5 metric thread
pitch.
2. DISCONNECT LATHE FROM POWER!
3. Open headstock end gear cover.
4. While holding 86T/91T gears, loosen arm
support cap screw shown in Figure 70, and
slowly let gears pivot down and away from
"G" position gear.
Figure 69. Locating change gears for 72 TPI.
30T Gear
Arm
Support
Figure 70. Arm support and end gears.
"G" Position
Gear
Arm Support
Cap Screw
86T/91T
Gears
Lower
Position
Gear 90T
72 TPI
Arm-Support
Cap Screw
Gear-Support
Shaft
30T Gear
90T Gear
86T Gear
91T Gear
5. Loosen 86T/91T gear support shaft and slide
middle gear away from lower position gear
(see Figure 71).
6. Remove cap screw and flat washer from "G"
position, position gear, then slide gears off of
shaft.
7. Slide 30T gear onto "G" position shaft, mak-
ing sure to align the key and keyway.
Note: Position the flat, non-stepped face of
the gear away from the headstock so it will
mesh with the 91T gear in Step 11.
8. Secure 30T gear with flat washers and cap
screws removed earlier.
Figure 71. End gear placement.
Arm-Support
Cap Screw
Gear-Support
Shaft
30T Gear
90T Gear
86T Gear
91T Gear
Figure 72. 30T gear installed.
9. Slide 91T gear against lower 90T gear (see
Figure 72) until they mesh with 0.002" to
0.004" backlash, then tighten gear support
shaft