Progressive Blasting Systems, Inc.

Michael L Tubergen

Bruce A Sterenberg

David J DeVos

A method and apparatus for masking a part during a multi-step process including a blasting process using abrasive media for etching or cleaning a part. In each step of the multi-step process, the workpiece and mask are aligned together by pins extending from a supporting surface of the apparatus. The pins have a lower surface configured to hold the workpiece and an upper part or portion of a triangular cross section to provide line contact with the walls of apertures in the mask and part. The triangular configuration keeps the mask aligned with the workpiece while at the same time allowing air to pass through the apertures. After the abrasive blasting process, a stream of compressed air is applied to the bottom of the part and mask to cause the mask to move or flutter up and down relative to the surface of the part. The compressed air sweeps away the abrasive media and debris so that the part and mask can be moved on for further processing with no danger that the mask has been accidentally locked to the part by material collecting in the aperture between the mask and pin or that the part has been locked to the pin.

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Kentwood, MI, United States of America

Michael L Tubergen