MachineryHouse AL-346V, Instruction Manual

Page: 32 / 82

- 30 -
4. The quick change gearbox there are four knobs, turn the first knob to “ 4 ” position, turn the second knob to “ S ”
position, turn the third knob to “ C ” position and turn the fourth knob to “ I ” position. See Figure 40.
Leaving 0.08mm–0.15mm backlash between gear teeth, arranges the 24 teeth change gear to 120 teeth and 120
teeth to 48 tooth change gear.
Figure 40
5. Rotate the spindle by hand to verify no binding exists, and close the gear door.
Thread settings
Regardless of the example given below, the setup procedure on this lathe is the same for metric, inch threads. These
thread selections are indicated by a series of letters and numbers shown on the headstock threading charts. First, the
change gear positions are checked and rearranged if indicated by the chart. Next, the quick change gearbox knobs and
levers are moved to specific positions also indicated by the chart.
To set up for threading:
1. Disconnect lathe from power!
2. Open the change gear door on the left-hand side of the headstock to expose the change gears.
3. Review the threading chart for the required thread to be cut (see
Figure 41 ). The chart indicates that to cut a 0.75
metric thread, the change gears and feed dials must be in the following positions:
Figure 41
4. Turn the first knob of the quick change gearbox to “ 2 ” position, turn the second knob to “ M ” position, turn the
third knob to “ A ” position and turn the fourth knob to “ I ” position. See Figure 40. Leaving 0.08mm–0.15mm
backlash between gear teeth, arranges the 24 teeth change gear to 120 teeth and 120 teeth to 48 tooth change gear.
5. Rotate the spindle by hand to verify no binding exists, and close the gear door.
Page 32 Instructions Manual for AL-346V (L555D) 01/09/2017