A NOVEL APPARATUS FOR SLIP GAUGE CALIBRATION AND A METHOD FOR CALIBRATION OF SLIP GAUGES

摘要

A novel apparatus for slip gauge calibration which comprises: a flat bottom non corrosive tank (1) filled with a transparent non corrosive liquid of known refractive index, the said tank (1) having placed at the inside bottom a platen (2), characterized in that the said platen (2) having placed on its top a reference slip gauge (3) having standard value ranges from 2.50009 to 50.00014 mm and a slip gauge (4) under test, the said test gauge (4) wrung adjacent to the said standard gauge (1) and on the same platen (2), the said tank (1) being provided with a liquid level adjuster essentially consisting of a solid cylinder (5) for sliding vertically in the said tank (1), the said solid cylinder being guided for vertical motion by a vertical support (6) fixed to the side wall of the tank (1) by known means, the top of the said solid cylinder being attached to a threaded screw (7) passing through a threaded hole in a horizontal plate (8) attached to the rim of the said tank (1), the said tank and accessories being placed on a standard platform with three dimensional movement, the said standard platform having a conventional optical microscope (9), the said microscope having attached to it, at the objective lens portion, a probe by known means, the said probe being connected to a digital position measuring instrument (10).