This is a small abrasive jet drilling machine. Abrasive Jet Machining is a non-conventional subtraction-type machining process in which
brittle-fracture mechanism is used to remove the material from work-piece.
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The small but hard abrasive particles hit the workpiece material with very high velocity (which is imparted by the pressurised air) & the ensuing collision results in minute fractures on the work-piece. This explains why this process can be used only for brittle materials. If the work-piece is ductile, the abrasive particles simply embed in or bounce off the work-piece surface and there is no material removal. The real beauty of this machining process is that it can be used to drill holes & make cuts in extremely thin & brittle materials like silicon wafers, glass panels & egg-shells. We used carbide nozzles of various hole sizes. The nozzle with 1.2 mm diameter was found to be the most suitable for operation. Sand of different grit sizes was used as abrasive material.
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