Strasbaugh Machine Description
Version 4.0 - February 1998 2 - 29
SHUTTLE ASSEMBLY
The shuttle assembly is comprised of the base plate and top plate sections.
Two hardened steel rails, two shock absorber hard stops, and an air cylinder
which actuates linear movement of the shuttle assembly are mounted on the
base plate. The air cylinder has a magnetic reed switch on each end to notify
the control computer whether the shuttle is in forward or back position. The
top plate is equipped with four bearing blocks which roll along the hardened
steel rails mounted in the base plate. The cleaning and load stations are
mounted on the top surface of the top plate.
On machines equipped with a second polish table, the shuttle assembly uses
locks operated by an air cylinder with reed switches to lock the table in its
back (polish) position. Machines with a second table installed have three
plates with two sets of hardened steel rails and bearings and one air cylinder.
POLISH TABLE DRIVE ASSEMBLY
The polish table drive assembly consists of a brushless DC servo motor,
worm gear reduction gearbox, shaft, and granite table. The brushless DC
servo motor is speed controlled by a servo controller, discussed in detail in
the Control System Description chapter of the 6DS-SP Maintenance manual.
The motor is bolted directly to the worm gear reduction gearbox. The
gearbox is mounted to a box beam of the machine's framework along the
backside and to an angled support beam at the front.
A drive shaft milled out of eight-inch steel stock runs through the middle of
the gearbox. The drive shaft is keyed to the drive train of the gearbox. The
top of the drive shaft has a flange head to which a subtable of 2 1/4- inch
thick steel is mounted.
The two-layer (granite top layer, stainless steel bottom layer) table assembly,
28 inches in diameter and six inches thick, is mounted to the subtable. The
drive shaft is hollow to permit routing of temperature-controlled water in and
out of the table. A rotary joint at the bottom of the drive shaft
accommodates plumbing of the inlet and outlet water lines.
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