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2. Straightedge - Wikipedia

   en.wikipedia.org/wiki/Straightedge

   True straightness can in some cases be checked by using a laser line level as an optical straightedge: it can illuminate an accurately straight line on a flat surface such as the edge of a plank or shelf. A pair of straightedges called winding sticks are used in woodworking to make warping easier to perceive in pieces of wood.

3. Snipe (wood machining) - Wikipedia

   en.wikipedia.org/wiki/Snipe_(wood_machining)

   Nevertheless, measuring a step in the surface of a piece of wood should not be an insurmountable problem. This is a classic application of a dial indicator . Also, a straight edge can be placed on the unaffected surface of the workpiece and the drop to the sniped area measured with a feeler gauge .

4. Surface metrology - Wikipedia

   en.wikipedia.org/wiki/Surface_metrology

   Digital Holography: this method provides 3D topography with a similar resolution as interferometry. Moreover, as it is a non-scanning technique, it ideal for the measurement of moving samples, deformable surfaces, MEMS dynamics, chemical reactions, the effect of magnetic or electrical field on samples, and measurement of the presence of ...

5. Profilometer - Wikipedia

   en.wikipedia.org/wiki/Profilometer

   Critical dimensions as step, curvature, flatness are computed from the surface topography. While the historical notion of a profilometer was a device similar to a phonograph that measures a surface as the surface is moved relative to the contact profilometer's stylus , this notion is changing with the emergence of numerous non-contact ...

6. Flatness (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Flatness_(manufacturing)

   Metrology of such a surface can confirm and ensure that the required degree of flatness has been achieved as a key step in a manufacturing processes. Two parts that are flat to about 1 helium light band (HLB) can be "wrung" together, which means they will cling to each other when placed in contact. This phenomenon is commonly used with gauge ...

7. Total indicator reading - Wikipedia

   en.wikipedia.org/wiki/Total_indicator_reading

   In metrology and the fields that it serves (such as manufacturing, machining, and engineering), total indicator reading (TIR), also known by the newer name full indicator movement (FIM), is the difference between the maximum and minimum measurements, that is, readings of an indicator, on the planar, cylindrical, or contoured surface of a part ...

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9. 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.