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There are a number of ways to measure the flatness of a surface. The most common method within the Flat Lapping sector is by using a Monochromatic Sodium light unit and an Optical Flat. This gives extremely precise measurements, more accurate than most CMM measurements, in an economical way.
- How to Use a Flatness Gauge
Similarly, if you wish to achieve a light band reading of...
- Monochromatic Light Source
This is used only when the light band patterns are curved....
- Passivation Machine
Passivation Machine Functionality Overview. The passivation...
- Reading Light Bands
Sample Flatness Interpretations. Drawings no. 1 – 6 show...
- How to Use a Flatness Gauge
How to Measure Flatness with Optical Flats by Van Keuren. Introduction. The easiest and best way to test the flatness of a flat lapped or polished surface is with an optical flat. Such surfaces are found on micrometers, measuring machines, gage blocks, snap gages, ring seals, valve seats and precision flat lapped parts.
To accurately measure the level of flatness, count the number of dark lines and multiply this by the width of the light band. This will give the height difference between the component's surface and the optical flat. This height difference will be represented in units of length, such as millimeters.
Sample Flatness Interpretations. Drawings no. 1 – 6 show sample light band readings on a rectangular workpiece. Straight, parallel, equally spaced light bands indicate true flatness. As the workpiece becomes less flat (concave or convex) the bands will show more curvature.
For use with Kemet Flat Lapping and Polishing Systems, Kemet Flatness Measuring Equipment is designed to assist in the measurement and maintenance of surface flatness. Optical Flats Produced from Quartz, Kemet Optical Flats are available in single and double sided, 1/4 light band or 1/10 light band accuracy.
What Are Light bands? Light bands formed by using an optical flat and a monochromatic light source represent an inexpensive yet accurate method of checking surface flatness. The monochromatic light on which the following diagramatic interpretations are based comes from a helium filled tube source which eliminates all
An optical flat is a contact optical measurement device used in conjunction with a monochromatic light source to measure precision flat surfaces. Lapmaster optical flats are manufactured from high quality fused quartz.
