Metrology Equipment Catalog - Rapp Industrial Sales

External MicrometersM E A S U R I N G I N S T RU M E N T S F O R L A R G E D I M E N S I O N SM E A S U R I N G I N S T R U M E N T S F O R L A R G E D I M E N S I O N SBrown & Sharpe - Everything You Needto Measure Large SizesLarge sizes in mechanical engineering are dimensions in excess of 20" (500 mm). Choosing the rightinstrument and method to measure large dimensions is crucial for minimizing gravity-induced distortion.For dimensions from 10" (250 mm) up to 6 ft (2 m), Brown & Sharpe offers different types of measuringinstruments that have long proven their value in practical use. Whatever the dimension, from a simpledistance between two parallel surfaces or the measurement of a large diameter, Brown & Sharpe’s line ofInside Micrometers, Universal Measuring Instruments, and Comparative Measuring Instruments includefeatures and accessories to accommodatevirtually any application.• Internal and external measuring, either vertically or horizontally.• Separate calibration of the measuring head, with measuring arms inposition, by means of the setting gage supplied.• Rigid, durable, firmly connected extension pieces of 1.5" (38 mm) diameter.• Negligible deflection in service.• Internal gage rods protected from thermal expansion due to hand heat by the surrounding walls ofthe extension pieces. Optional 40" (1000 mm) extensions are available for very long measurements.Above 100" (2500 mm) some accuracy is lost and special handling is required. Consult with yoursales representative or the factory.Measuring head:Micrometer system with .05" (1 mm) pitch and a range of 1" (25 mm), barrel graduations .0005"(0.01 mm). The plunger movement is transmitted to a dial indicator with .0005" (0.01 mm) scale readingand an anti-shock mechanism, with ball bushings. Simple conversion from internal to external measurementand vice-versa by turning a screw on the measuring plunger.Measuring arms:Hexagonal section, clamped to the fixed anvil and the measuring plunger, at the height needed for thecomponent being measured. Three pairs of standard arms, all fitted with tungsten carbide contactfaces: contact faces spherical, on instrument centerline, for internal measurements; offset, for depths to2" (50 mm), for internal and external measurements; extra-rigid, for depths to 3" (75 mm).D-2Rapp Industrial Sales888 789-7277