LATHE OPERATIONS - OD1645 - LESSON 1/TASK 1
FIGURE 7.
QUICK-CHANGE GEAR BOX (REAR VIEW).
of the upper level produce three different gear ratios for each of the 8
changes obtained with the lower lever, thus making 24 combinations in the
box alone.
This range can be doubled by using the sliding compound gear
which provides a high- and low-gear ratio in the main gear train.
This
gives two ratios for every combination obtainable in the box, 48
combinations in all.
(10) Compound Rest.
The compound rest (figure 8 on page 20) provides a
rigid adjustable mounting for the cutting tool. The compound rest assembly
has the following principal parts:
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