LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
(2) The indexing head (figure 37) attaches to the left end of the lathe
headstock. The expanding mandrel, with a split-sleeve adapter, is inserted
into the lathe spindle for driving or holding the spindle.
With the
indexing head affixed to the headstock and headstock spindle, the spindle
will not rotate freely, but will move when the crank of the indexing head is
turned.
Forty turns of the crank will move the headstock spindle through
one complete revolution. Caution must be taken to insure that the headstock
spindle is in a neutral position before the indexing head is attached.
Index plates containing concentric rings of evenly spaced holes are fastened
to the index head beneath the crank. Each concentric ring has a different
number of holes per circle, and each index plate has six concentric rings.
FIGURE 37. INDEXING HEAD OF THE VERSA-MIL
INSTALLED ON THE LATHE.
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