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Understanding
Gear Charts
The Lathe can be geared for a variety of
different feed rates, so charts are placed on the
drive cover of the lathe that explain how to set
up the gear combinations for each type of
carriage feed application. Three applications
are broken into two categories of charts-turning
and threading.
Turning chart: The speeds given on the
turning chat represent standard speeds for most
types of turning applications. See Figure17.
Figure17.
Threading charts:: By arranging the gears as
shown on the threading charts (see
you can set up the carriage feed to cut any of
the thread pitches indicated.
This is how to read the feed rate charts:
1.
The box in the upper left-hand corner of each
chart tells whether that chart represents carriage
feed movement for metric or imperial threads.
These boxes are shaded in
Figure 18
Figure
19),
Figure 18
Figure 19 metric char
2. The boxes in the top row of each chart
(excluding the box in the left-hand corner)
shows the thread pitches listed on that chart.
These boxes are shaded in
Figure 20
3. The boxes on the left-hand column
(excluding the box in the upper left-hand corner)
represent the gear positions on each shaft.
These boxes are shaded in
shafts are called out with arrows.
19
Figure 20
Figure 21
and the
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