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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
1 Light band 0.00029mm 2 Light bands 0.00058mm 3 Light bands...
- Passivation Machine
Passivation Machine Functionality Overview. The passivation...
- How to Use a Flatness Gauge
Articles for Precision Lapping. Reading Light Bands. 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.
15 lut 2018 · A method of measuring seal face flatness. One helium light band equals 0.0000116 inches or 0,3 microns. Seal faces are lapped to less than one helium light band by most seal manufacturers, but after lapping the part relaxes and can go out of flat as much as three helium light bands.
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Light band readings are a very valuable way to check for improper lapping techniques, incorrect vehicle and abrasive ratios, or faulty equipment. The two examples below show the most typical light band patterns occurring from such causes. A bulls-eye light band pattern indicates a spherical surface which may be either concave or convex. The
17 lut 2018 · If the seal faces stay flat within three helium light bands, and the lapped seal faces stay in contact, a single stationary type mechanical seal can easily pass fugitive emission specifications of less than one hundred parts per million.
Flatness Gauge Reading (mm) Precision Surface Flatness Analysis using Light Band Patterns. Analyzing Interference Fringes with Optical Flat for Accurate Flatness Measurement. To read light bands with an Optical Flat, the first step is to ensure that both the surfaces of the component and the optical flat are clean.
