Strasbaugh Mechanical Description
Version 4.0 - February 1998 4 - 13
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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