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2. Indicator (distance amplifying instrument) - Wikipedia

   en.wikipedia.org/wiki/Indicator_(distance...

   Ideal test indicator pushed. Prior to modern geared dial mechanisms, test indicators using a single lever or systems of levers were common. The range and precision of these devices were generally inferior to modern dial type units, with a range of 10/1000 inch to 30/1000 inch, and precision of 1/1000 inch being typical.

3. Dial (measurement) - Wikipedia

   en.wikipedia.org/wiki/Dial_(measurement)

   A dial is generally a flat surface, circular or rectangular, with numbers or similar markings on it, used for displaying the setting or output of a timepiece, radio, clock, watch, or measuring instrument. [1] Many scientific and industrial instruments use dials with pointers to indicate physical properties.

4. Surface plate - Wikipedia

   en.wikipedia.org/wiki/Surface_plate

   In this process, three approximately flat surfaces are progressively refined to precise flatness by manually rubbing them against each other in pairs with colouring matter in between, and then hand-scraping the high points. Any errors of flatness are removed by this scraping, since the only stable, mutually conjugate surface shape is a plane.

5. Total indicator reading - Wikipedia

   en.wikipedia.org/wiki/Total_indicator_reading

   The indicator traditionally would be a dial indicator; today dial-type and digital indicators coexist. The earliest expansion of "TIR" was total indicated run-out and concerned cylindrical or tapered (conical) parts, where " run-out " (noun) refers to any imperfection of form that causes a rotating part such as a shaft to "run out" (verb), that ...

6. Lapping - Wikipedia

   en.wikipedia.org/wiki/Lapping

   The easiest method for measuring flatness is with a height gauge positioned on a surface plate. You must set up the part on three stands and find the minimum variation while adjusting them, just placing the part on the surface plate and using a dial indicator to find TIR on the opposite side of the part measures parallelism. Flatness is more ...

7. Gauge (instrument) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(instrument)

   Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard. It is used as a reference for the setting of measuring equipment used in machine shops , such as micrometers , sine bars , calipers , and dial indicators (when used in an inspection role ).