Tc 9-524 fundamentals of machine tools

9-5

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TC 9-524
Machining done on the lathe with a Versa-Mil allows the
cutter to move along three different axes: vertical, lateral, and
longitudinal (x, y, z). However, not all machining can be done
using the lathe. Because the lathe allows longitudinal and
lateral movement, mounting the Versa-Mil directly to a bench
or piece of equipment would severely restrict its machining
capabilities. Feed tables eliminate that restriction by providing
those two additional directions of travel. Feed tables mounted
directly to a bench or piece of equipment allow the Versa-Mil
to perform machining in all three directions.
SELECTION OF ARBORS
When the basic unit is to be used independently or with an
attachment other than the grinding attachments, an arbor and
cutter must be selected and mounted. The cutter should be
mounted onto the arbor first. The arbor should be secured in a
vise to properly mount the cutter.
This ensures a properly torqued cutter and prevents the arbor
from bending or causing damage to the Versa-Mil basic unit.
When tightening the arbor nut, the pressure applied to the
wrench should always be in the direction of the operator in
case of slippage. Listed in the following paragraphs are
various arbor styles and some of their uses. Note that they are
similar to, but smaller than those used on a milling machine.
Refer to chapter 8 for illustrations not listed.
Taper Arbors
Taper arbors (Figure 9-14) are designed primarily for use
with Brown and Sharpe, or Morse standard taper shank tools.
Fly-Cutting Arbor
The fly-cutting arbor may be used for boring, facing, gear
repair, keyway milling, and form milling. This type of arbor
allows the tool bit to be positioned at either 45° or 90° to the
arbor axis.