Pneumatic system-
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System operated with Air.
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Open loop system
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Generally used for low pressure
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Generally delivers less force compared to hydraulic
system
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Cheaper compared to hydraulic for basic cost. But
compressor running cost is more
Hydraulic system-
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System operated with fluid - oil.
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Closed loop system
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High pressure system
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Generally used for heavy force delivery
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Initial cost is high
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More expensive
Pneumatic system is mostly preferred over hydraulic system in BIW welding fixture.
All toggle clamp, pin cylinder, slides are operated via pneumatic.
Generally cylinder are designed to operate max pressure 12-13 bar. As it expensive and difficult to maintain 10-12 bar in shop floor it is preferred to do design pneumatic systems at 6 bar pressure
Industrial inspection and quality control rely on precision measuring machines and precision fixturing alike. Reliable and repeatable fixture set-up is a basic requirement for successful and accurate measurement. Therefore fixturing is as important a part of proper quality control as the choice of a suitable CMM, form measuring machine or vision measurement system.
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