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G4002/3 Gear Head Lathes -19-
Thread Selection Cont.
Metric threading requires 5 gear changes to
achieve all of the available pitches listed on the
chart. Refer to Figure 19 while reading the
instructions below.
To change gears:
1. Loosen the nut below the middle gear and
rotate the bracket so the middle gear
moves away from gear F.
2. Loosen the cap screw at the center of the
middle gear and slide it away from gear G.
3. Gear F can be removed by loosening the
cap screw in its middle. Gear G has a
setscrew in its rim. Loosen this screw and
pull the gear off of the shaft.
4. Replace these two gears with the gears
which will produce the desired pitch and
secure with screws provided.
Figure 19. Gear Placement
5. Slide the middle gear until it is in mesh with
the G Gear. Tighten the cap screw at the
center.
6. Pivot the bracket until the middle gear is in
mesh with gear F and tighten the nut below.