Machinery's Handbook, 31st Edition
724 Gage Blocks Set Number 9 (20 Blocks): First Series: 0.0001-Inch Increments (9 Blocks), 0.0501 to 0.0509; Second Series: 0.001-Inch Increments (10 Blocks), 0.050 to 0.059; One Block 0.05005 inch. Gage Block Sets, Metric Sizes (Federal Specification GGG-G-15C).— Set Number 1M (45 Blocks): First Series: 0.001-Millimeter Increments (9 Blocks), 1.001 to 1.009; Second Series: 0.01-Millimeter Increments (9 Blocks), 1.01 to 1.09; Third Series: 0.10-Millimeter Increments (9 Blocks), 1.10 to 1.90; Fourth Series: 1.0-Millimeter In - crements (9 Blocks), 1.0 to 9.0; Fifth Series: 10-Millimeter Increments (9 Blocks), 10 to 90 mm. Set Number 2M (88 Blocks): First Series: 0.001-Millimeter Increments (9 Blocks), 1.001 to 1.009; Second Series: 0.01-Millimeter Increments (49 Blocks), 1.01 to 1.49; Third Series: 0.50-Millimeter Increments (19 Blocks), 0.5 to 9.5; Fourth Series: 10-Millimeter Increments (10 Blocks), 10 to 100; One Block 1.0005 mm. Set Number 3M: Gage block Set Number 3M (112 Blocks) is not given here. It is similar to Set Number 2M (88 Blocks), and the chief difference is the inclusion of a larger number of blocks in the 0.5-millimeter increment series up to 24.5 mm. Set Number 4M (45 Blocks): First Series: 0.001-Millimeter Increments (9 Blocks), 2.001 to 2.009; Second Series: 0.01-Millimeter Increments (9 Blocks), 2.01 to 2.09; Third Series: 0.10-Millimeter Increments (9 Blocks), 2.1 to 2.9; Fourth Series: 1-Millimeter Increments (9 Blocks), 1.0 to 9.0; Fifth Series: 10-Millimeter Increments (9 Blocks), 10 to 90 mm. Set Numbers 5M, 6M, 7M: Set Numbers 5M (88 Blocks), 6M (112 Blocks), and 7M (17 Blocks) are not listed here. Long Gage Block Set Number 8M (8 Blocks): Whole-Millimeter Series (8 Blocks), 125, 150, 175, 200, 250, 300, 400, 500 mm. Surface Plates The surface plate is the primary plane from which all vertical measurements are made. The quality and dependability of this surface is one of the most critical elements in dimen sional inspection measurement. Originally made from cast iron, the present-day granite plate was first developed during World War II because most metal was being used in the war effort. Faced with a need to check precision parts, Mr. Wallace Herman, a metal working and monument shop owner, decided to investigate the use of granite as a suitable replacement for the then-common cast-iron surface plate and manufactured the first gran - ite surface plate in his shop in Dayton, Ohio. Although surface plates have changed in their design and materials, the basic concept has remained the same. The stability and precision that can be achieved with granite is actually far superior to cast iron and is much easier to maintain. With the proper care and maintenance, a well-made surface plate can last for generations and always remain within the parameters of the grade to which it was originally made, or even better. Materials and Grades of Surface Plates.— The selection of a surface plate is driven directly by the specific application the plate will be used for. A plate, for instance, that will be used in a very large machining facility would be primarily concerned with the load-bearing properties and secondarily in surface flatness accuracy, although both are important concerns. A surface plate that will be used in a metrology laboratory or high precision inspection department with a high volume of work would be concerned with high accuracy and surface wear properties. In each case the material and design would be considered for the application in mind before a selection is made and a purchase initiated. The material properties of the granite is what makes the difference in the performance of surface plates. The differences in the various types of granite are considered in Table 1, based on Federal Specification GGG-P-463c, Plate, Surface (Granite) (Inch and Metric).
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