Pneumatic counterbalance for a coordinate measuring machine

Details Pneumatic counterbalance for a coordinate measuring machine Pneumatic counterbalance for a coordinate measuring machine

G - Physics

01

B

33/139

G01B 13/00 (2006.01) G01B 5/00 (2006.01) G01B 21/00 (2006.01) G01B 21/04 (2006.01)

Patent

CA 1172445

ABSTRACT A coordiante measuring machine (10) having a vertically movable probe (41), the weight of which is offset by an improved pneumatic counterbalance (50). The pneumatic counterbalance system (50) is adapted to use a source of pressurized air (72) acting upon a ball piston (54) which is directly connected to a probe arm (42) which supports the probe (41). An accumulator (60) having a capacity large enough to insure only a small change in the counterblanced force as the ball piston (54) moves within its cylinder (52) is provided. A valve (70) is provided in the connection of the air supply (72) to the accumulator (60). The valve (70) is adjusted to provide make up air for the air which leaks past the ball piston (54). Preferably, the accum- ulator (60) is formed as a pressurized plenum (60) which surrounds the cylinder (52).

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