Abstract
This chapter presents a stitching linear-scan method for roundness measurement of small and/or micro cylinders, which is different from the conventional rotary-scan method used in commercial roundness measuring machines. In the stitching linear-scan method, the roundness of a small cylinder is obtained by stitching a series of arc profiles around the circumference of the cylinder linearly scanned by a surface form stylus profile. The method can overcome the difficulty in a conventional roundness measuring machine for accurately aligning a small cylinder with the rotational datum axis. A linear-scan micro roundness machine is established by using a commercial surface profiler. A steel needle roller with a diameter of 1.5mm and a length of 5.8mm is measured by the roundness measuring machine. Measurement repeatability was evaluated to be ±0.04μm for both the diameter and the out-of-roundness. The feasibility of the proposed stitching linear-scan method has been demonstrated by experimental results in measurement of small/micro cylinders.
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