Modified versions of several top-entry servo robots are designed for cleanroom applications, conforming to Class 1000 or above by U.S. Federal Standard 209e, or Class 6, according to ISO 14644-1. The cleanroom design is available on several models?from the W621 through W633?for machines ranging from 40 to 650 tons. The robots are capable of a variety of payloads and strokes, including both single and telescopic vertical arms.
The robots were adapted to conform to Class 1000 requirements through tests and measurements of various robot components, which were performed in cleanroom environments under production conditions and in close cooperation with a cleanroom consultancy.
Measurements reported an average emission of particles of size .5 mm at just above 100/sq ft. This low emission rate is independent of robot speed but might be influenced by the design of the surrounding cleanroom.
The robots remain unchanged in terms of the performance specifications from their standard versions. They all feature smooth, closed surfaces, rack and pinion instead of a tooth-belt design, and an exhaust-air collection system. The robots are programmed and operated using the TeachBox control, a graphical handheld teach pendant. Specialized custom end-of-arm tooling, safety guarding, and downstream automation can also be supplied as part of a complete workcell.
Wittmann Inc., Torrington, CT