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Air system requirements
A clean, dry air supply to the head is required for axis motor cooling to give optimum metrology performance. This air supply must conform to the specifications laid out in the table below.
NOTE: The air supply piping should be suitably fixed to the CMM and secured around the air fixing barb on the rear of the PHS-2 male kinematic.
| Air fitting | Single barb diameter 6.0 mm To suit flexible polyurethane tubing 6 mm - 1/4 in OD |
| Airflow rate | Typically 0.35 litres/second free air at standard atmospheric conditions |
| Pressure at head | 5 bar (70 psi) to 6 bar (90 psi) gauge at the head |
| Pressure sensing switch | A pressure sensing switch is required to input to the PC card Switch to open if pressure drops below 3 bar (45 psi) |
| Cleanliness: | |
| Maximum allowable particle size | 0.1 µm (as ISO 85731 Class 1) |
| Maximum allowable concentration of particles | 0.1 mg/m³ at standard atmospheric conditions (as ISO 8573-1 Class 1) |
| Oil: Maximum allowable concentration of droplets, aerosols and vapours | 0.01 mg/m³ of the air at standard atmospheric conditions (as ISO 8573-1 Class 1) |