Slip gauges are used as measuring blocks. It is also called as precision gauge blocks. They are made of hardened alloy steel of rectangular cross-section. The surfaces of slip gauges are made to a high degree of accuracy. The distance between the two opposite faces indicates the size of the gauge. But all slip gauges are made to same thickness to perform wringing. Wringing or sliding is nothing but combining the faces of slip gauges one over the other. Due to adhesion property of slip gauges, they will stick together. This is because of very high degree of surface finish of the measuring faces. They are used in comparators and sin bars. They are mainly used as testing and calibrating instruments in metrology. Different sets of slip gauges are manufactured in standard sets of 32 pieces, 45 pieces, 88 pieces, etc. A set of 45 pieces of slip gauges is shown in Figure 18.19. A slip gauge set of 56 pieces is made up as follows: 9 slips 1.001 to 1.009 in steps of 0.001 mm; 9 slips 1.01 to 1.09 in steps of 0.01 mm; 9 slips 1.1 to 1.9 in steps of 0.1 mm; 25 slips I to 25 in steps of 1 mm; 3 slips 25 to 75 in steps of 25 mm; and one slip of 1.0005 mm.
Figure 18.19 Slip Gauge Box with 45 Pieces of Slip Gauges
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