Operations and Maintenance Manual Mechanical Description
Version 1.2 - June 2004 4 - 3
MECHANICAL DESCRIPTION
OVERVIEW
This chapter provides descriptions of the mechanical assemblies and components
participating in the auto grind cycle functions.
For a description of the auto grind cycle of operation (the sequence of events), refer to
the Operator Functions chapter of this manual.
GRINDING AREA
BRIDGE ASSEMBLY
The bridge assembly encloses and supports the left and right upper spindle assemblies
and their associated hardware. Supported by two rails mounted on a solid framework,
the bridge assembly moves between the left and right work chucks.
Eight (four per spindle) linear bearing blocks, attached to the underside of the bridge
assembly, ride along the top of the rails. The drive assembly is a recirculating ball and
lead screw supported by the machine's framework at each end. Two pulleys and a
toothed drive belt connect the lead screw to a brushless DC servo motor. This
arrangement converts motor drive force into linear motion, moving the bridge
assembly left or right. The motor, mounted to the bed in the right side rear of the
machine, is accessible through doors 16 and 17. Limit switches and shock absorber
hard stops at each end of the rails ensure the bridge assembly does not "run away",
crashing into the side walls of the machine. Encoder feedback constantly reports back
to the control computer the exact position and velocity of the bridge assembly.
The bridge is two separate pieces tied together by a stress-proof shaft to eliminate the
possibility of transferring vibration from one spindle to the other.
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