Abrasive jet machining (AJM) is a novel machining processes to fabricate functional surfaces. In this study, the removal mechanism of the impact by particles has been investigated. Firstly, the effect of the impact of a single alumina particle impacting on the glass substrate was studied. It was found that when the particle velocity was less than 16.2 m/s, lateral cracks were not formed. Next, the effect of multiple alumina particles was studied. The threshold condition of the quantity of the

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... pacting particles that the cracks accumulate on the blasting area was determined to be 15 mg/mm 2 . It is thought that existing cracks blocked the formation of the crack at the quantity of impacting particles of more than 15 mg/mm 2 .