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G9729 Combination Lathe/Mill
-37-
Reading the Charts
Charts for the powerfeed and thread cutting fea-
tures for the lathe are located on the bottom of the
lower belt guard. Figure 38 shows a segment of
the
chart for feed rates with a brief description.
Figure 38. Rates
given in millimeters and
inches.
Note—These charts reflect approximate apron
movement
per revolution of the leadscrew.
1. Gear
position A and the gears needed to
accomplish the available feed rates.
2. The
available feed rates in millimeters per
revolution.
3. The
available feed rates in inches per revolu-
tion.
4. The
feed lever position column.
5. The
available feed rate columns.
Feed rate gear settings are detailed in Figure 38.
In
the example below we will be selecting gears
for a feed rate of 0.002" per revolution:
1. Find
0.002" on the chart in Figure 38.
2. Locate
the number in gear position A, which
is above 0.002". The number in this case is
24, representing a gear with 24 teeth.
3. Look
at the column for the feed lever posi-
tion and find the roman numeral next to the
0.002". In this case III.
4. Change the gears at the B, C, & D locations
as
necessary (see Figures 38 & 42).
To
make a cut using a feed rate of 0.002" per
revolution, install the 24 tooth gear into position
A, (see Figure 38) and move the feed lever into
position
III as in Figure 39. For making any other
gear
changes, see the section titled Changing
Gears on Page 39.
Note— The corresponding feed rate in millime-
ters
would be 0.05 millimeters per revolution and
the gearing is identical.
Feed Rates
Figure 39. Feed rate selector set to “III”.
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