Appeal No. 1998-0331
Application No. 08/297,257
machine tool is provided with a system for preloading the
spindle carriage bearings 44 so as to insure that the
workpieces W are more rigidly held in position during
machining operations and insuring more accurate and
reproducible machining. See col. 6, ll. 29-35. More
particularly, Burka describes the preloading system as
including a cam member 100, a roller actuator 104 and a
valve 106. During indexing of the spindle carriage 34, the
roller 104 rolls along the cam 100 with the valve 106
remaining in the normally closed position, blocking the feed
port from a central manifold 24 and venting a hub space S to
atmosphere. Just as the spindle carriage 34 approaches the
end of the indexing cycle, the roller actuator 104 following
the cam 100 is forced to actuate the valve 106. This closes
the hub space S to atmosphere and opens it for communication
with the central manifold 24. Accordingly, pressurized fluid
fills the hub
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