Page 293 - Mahr马尔量具完整

Millimar | Air Gage Metrology

Metrology

Millimar evaluation units work according to the principle of
determination of changes in air pressure; the pressure differential
between two chambers is measured. While one of the two
chambers provides a constant reference pressure, the pressure
of the other chamber (measuring chamber) is determined by the
distance of the measuring jet of an air measuring value recorder
to the test specimen.
Millimar evaluation units have two connection points that are
each directly connected to one of the two pressure chambers.
Thus, the measuring value is measured directly, without any
conversion via a Piezo pressure sensor, and is then digitalized.
Magnifications from 2500:1 to 10000:1 are realized with
exchangeable instrument jets.
Millimar measuring units must be supplied with constant air
pressure through a pressure reducing valve. Measuring units with
pressure reducing valves can be connected to all compressed air
lines from 3.5 bar to 10 bar overpressure, whereby an air filter
should be interconnected.
The air must be dry and oil free.

Metrological

• Universal, relilable, proven, especially high-performing • Airgage display unit for all applications
• All measuring methods: individual, total and differential • Small, handy and easy to use
measurements • Fully automatic working electrical units for measuring, control
• High accuracy, long-term stability, insensitive to environmental and sorting processes
influences • Measurement control unit for production machines
• Up to 10000x magnification of the measuring values, large • Millimar single and multi-column units to set-up complete
measuring ranges testing control units
• High measuring accuracy and reproducibility for the measuring • Due to their modularity and ability to be mounted close to each
results: depnding upon the magnification 0.5 µm to 20 µm other, as well as their long-range scale readings, Millimar single
• Contact free measurements with measuring jets, no damage to and multi-column units can be set up as complete testing control
the workpieces systems
• Reliable measurements of even uncleaned, oiled and lubricated • Versatile measuring elements: jet air probes, jet air plugs gage,
workpieces, or workpieces with lapping paste. Measuring points jet air ring gages, air caliper gages, angularity plug gages,
are cleaned by the measuring air angularity measuring rings, taper jet plug gages, taper jet ring
• Linear display of the measuring values on a clear, large or long gages and measuring units for mating parts for contact-free
scale, easy and error-free reading of measuring results measurement
• Measurement of diameters, distance between holes, tapers, • Unusually long lifetime of the air measuring elements
eccentricities, alignment of bores, mating measurements, etc. • Robust model for the shop floor. Models for all applications.
• Various measuring possibilities due to the corresponding • Special models for special tasks
adaption to existing measuring problems

General Technical Data of Air Gages

Air gaging is a measuring system that uses air pressure to
determine the size of the measured part. The relationship
between air pressure and distance of a restriction (workpiece) to
the air escape (jets) can be plotted on a graph (line a). JET WORKPIECE
As the distance between jets and work surface increases, the
pressure decreases and the ratio becomes linear as represented
by the straight section “B“. This straight portion of the curve PRESSURE DISTANCE
can be accurately calibrated, and represents the scale of the
Dimensionair®. Compare its length with “C“ on the other curve,
which is the usable portion of other air gage scales. This longer
linear scale gives the Dimensionair® its longer usable measuring
range.
DISTANCE

Millimar | Electrical Length Measuring Instruments 289