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Контрольно-измерительный инструмент и оборудование / Measuring instruments

MITUTOYO | Каталог MITUTOYO 2015 Измерительный инструмент GB-20001 (Всего 663 стр.)

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Internal Micrometers Mitutoyo Quick Guide to Precision Measuring Instruments How to Read the Scale Graduation 0.005mm

177 Каталог MITUTOYO 2015 Измерительный инструмент и оборудование Издание GB-20001 Стр.177

177 Internal Micrometers Mitutoyo Quick Guide to Precision Measuring Instruments How to Read the Scale Graduation 0.005mm Каталог MITUTOYO 2015 Измерительный инструмент и оборудование для контроля и измерений в машиностроении Издание GB-20001 Стр. 177 ENG

Internal Micrometers Mitutoyo Quick Guide to Precision Measuring Instruments How to Read the Scale Graduation 0.005mm

Internal Micrometers Mitutoyo Quick Guide to Precision Measuring Instruments How to Read the Scale Graduation 0.005mm Outer sleeve Thimble 35 mm 0.015 mm Reading 35.015 mm Thimble (1)- Outer sleeve- (2) Changes in measured values at different measuring points When Holtest is used the measured value differs between measurement across the anvil and the measurement only at the tip of the anvil due to the product mechanism. Adjust the start point under the same condition before measurement. When you use the tip of the anvil for measurement adjust the start point for using the tip of the anvil. Airy and Bessel Points When a length standard bar or internal micrometer lies horizontally supported as simply as possible at two points it bends under its own weight into a shape that depends on the spacing of those points. There are two distances between the points that control this deformation in useful ways as shown below. The ends of a bar (or micrometer) can be made exactly horizontal by spacing the two supports symmetrically as shown above. These points are known as the 'Airy Points' and are commonly used to ensure that the ends of a length bar are parallel to one another so that the length is well defined. The change in length of a bar (or micrometer) due to bending can be minimized by spacing the two supports symmetrically as shown above. These points are known as the 'Bessel Points' and may be useful when using a long inside micrometer. Measurement error due to temperature variation of micrometer Heat transfer from the operator to the micrometer should be minimized to avoid any significant measuring error due to temperature difference between the workpiece and micrometer. If the micrometer is held directly by hand when measuring use gloves or hold the heat-insulator (if fitted). Misalignment Errors Inside diameter to be measured L Length measured with axial offset X X Offset in axial direction M Error in measurement M L- V 2+X2 -I Inside diameter to be measured L Length measured with radial offset X X Offset in radial direction M Error in measurement M L- 2-X2 If an inside micrometer is misaligned in the axial or radial direction by an offset distance X when a measurement is taken as in Figures 1 and 2 then that measurement will be in error as shown in the graph below (constructed from the formulae given above). The error is positive for axial misalignment and negative for radial misalignment. Misalignment (offset) of one end of micrometer (mm) Bore Gages Mitutoyo bore gages for small holes feature contact elements with a large curvature so they can be easily positioned for measuring the true diameter (in the direction a-a') of a hole. The true diameter is the minimum value seen on the dial gage while rocking the bore gage as indicated by the arrow. Anvil The spring-loaded guide plate on a Mitutoyo two-point bore gage automatically ensures radial alignment so that only an axial rocking movement is needed to find the minimum reading (true diameter). 177 Mitutoyo Contact point Cone Nomenclature


MITUTOYO | Каталог MITUTOYO 2015 Измерительный инструмент GB-20001 (Всего 663 стр.)

Контрольно-измерительный инструмент и оборудование / Measuring instruments


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