Strasbaugh 7AA - Mechanical Overview

Strasbaugh Machine Description
Version 1.2 - April 18, 1996 3 - 7
MECHANICAL OVERVIEW
This section describes the fundamental principles of the mechanics
of the grind operation for the 7AA. The mechanical functions
consist of the grind assembly bed, work spindle carriage, grind
spindle support, and grind spindle feed mechanism. The
numerous other mechanical features of the machine are less
critical and less complex and therefore should not require
discussion here.
GRIND ASSEMBLY BED
The grind assembly bed provides the structural foundation for the
entire grinding assembly. The bed itself consists of a weldment of
heavy duty steel upon which hardened precision ways are
mounted. The entire bed is stress relieved and precision ground
after assembly. The bed rests on steel supports welded to the
inside walls of the main machine cabinet. The work spindle
carriage slides on the bed ways. The grind spindle support is
assembled above the grind bed. This assembly provides the
necessary mechanical motions with superior structural rigidity to
perform the precision grinding operation.
WORK SPINDLE CARRIAGE
The work spindle carriage consists of a cast iron casting. The
carriage ways slide on the grind bed ways. This provides for
smooth, stable travel of the work spindle assembly. The work
spindle carriage assembly includes the work spindle air bearing
and drive motor. The work spindle is driven with a belt coupling the
motor and spindle pulleys. The carriage is driven by a ball nut
mounted on the carriage. The ball screw is fixed to the grind bed
and driven by the x axis servo motor.
GRIND SPINDLE SUPPORT
The grind spindle support provides the mounting structure for the
grind spindle assembly. The structure extends vertically from the
mounting surfaces located on the grind assembly bed. The front of
the spindle upright casting fastens securely to a flexure