A NON-DESTRUCTIVE PNEUMATIC APPROACH FOR MEASURING INNER ROUNDNESS OF MILLIMETER-SCALE METAL SLEEVES
Keywords:
Inner roundness, motor sleeve, pneumatic measuring device, peak to peak principleAbstract
This research work presented a non-destructive pneumatic method for measuring the inner roundness of millimeter-scale metal sleeves. An air micrometer with 2 air jet outlets was placed inside a metal sleeve at the center of the sleeve. In an instant, the air jet nozzle injected an air jet stream toward the inner wall of the metal sleeve, yielding the distance between the air jet nozzle and the inner wall of the sleeve. The measured distances were converted to the inner diameter of the metal sleeve based on its cylindrical geometry. As the air jet nozzle rotated 360 degrees around the axis of the cylindrical sleeve sample, multipoint inner diameter data of the sleeve sample were collected. These diameters were used to construct the inner roundness of the sample using the peak to peak principle. In this study, the roundness of the metal sleeve samples was determined using the non-destructive pneumatic instrument and compared with those obtained by a commercial contact type roundness measuring instrument. The comparison showed good agreement (<10% difference) when a workpiece was conforming (roundness <1 μm). However, higher deviations were obtained when a workpiece was non-conforming (roundness >1 μm).
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