Abstract
Until now, the autocollimation principle has been applied to the system to measure accuracies of a deep hole, and its accuracies have been evaluated. The measuring unit is installed in the front end of a laser-guided probe. The hole accuracies are measured by scanning the hole wall spirally. In this research, the accuracy and repeatability of the measuring unit are examined by measuring the roundness, cylindricity and straightness of holes. As a result, it is clarified that the accuracies measured by the measuring system correspond well to the tester in both shape and value and that the standard deviation of ten measuring values of roundness is 0.19μm.
