SURFACE FINISH COMPARISON CHART
| SURFACE FINISH COMPARISON CHART | |||||||||||||
| RA is the arithmetic average deviation of the surface valleys and peaks and is often used to specify the roughness of a machined surface. RMS is the root mean square average of the profile height deviations from the mean line of the surface and is mostly used for optical surfaces. | |||||||||||||
| The term Micro means millionth. So 1 micrometer is 1 millionth of a meter, or .000001 meter. Likewise 1 microinch is 1 millionth of an inch, or .000001". The term "Micron" refers to 1 millionth of a meter, which is also equivalent to 1 thousanth of a millimeter (.001 mm), and is represented by the greek symbol μ. Ra microinch ( μ" ) is basically the same as the CLA scale, or centerline average. | |||||||||||||
| Some Useful Conversions: | |||||||||||||
| Inch = " or in | 1 microinch (μ") = 0.0254 micrometers (or microns) | ||||||||||||
| Micron = µ | 1 microinch (μ") = 0.0000254mm | ||||||||||||
| Micro Inch = µ" | 0.001" = 0.0254mm | ||||||||||||
| Micrometer = µm | |||||||||||||
| Millimeter = mm | |||||||||||||
| Below are equivalent values on various surface measurment scales, and the manufacturing methods capable of producing these finishes. | |||||||||||||
| New ISO scale numbers | 1. | 2. | 3. | 4. | 5. | 6. | 7. | 8. | 9. | 10. | 11. | 12. | |
| RMS Microinches ( μ" ) | 0.5 | 1.1 | 2.2 | 4.4 | 8.8 | 17.6 | 35.2 | 64.3 | 137.5 | 275 | 550 | 1100 | 2200 |
| RMS Micrometers ( μ m ) | 0.013 | 0.027 | 0.055 | 0.11 | 0.22 | .44 | .88 | 1.6 | 3.44 | 6.88 | 13.75 | 27.5 | 55 |
| CLA or Ra microinch ( μ" ) | 0.5 | 1 | 2 | 4 | 8 | 16 | 32 | 63 | 125 | 250 | 500 | 1000 | 2000 |
| Ra micrometer ( μ m ) | 0.012 | 0.03 | 0.05 | 0.1 | 0.2 | 0.4 | 0.8 | 1.6 | 3.2 | 6.3 | 12.5 | 25 | 50 |
| Sand Casting | |||||||||||||
| Hot Rolling | |||||||||||||
| Forging | |||||||||||||
| Permanent-Mold Casting | |||||||||||||
| Investment Casting | |||||||||||||
| Extruding | |||||||||||||
| Cold Rolling | |||||||||||||
| Diecasting | |||||||||||||
| Flame Cutting | |||||||||||||
| Sawing | |||||||||||||
| Planing | |||||||||||||
| Drilling | |||||||||||||
| EDM | |||||||||||||
| Milling | |||||||||||||
| Laser Cutting | |||||||||||||
| Reaming | |||||||||||||
| Broaching | |||||||||||||
| Turning and Boring | |||||||||||||
| Tumbling | |||||||||||||
| Roller Burnishing | |||||||||||||
| Grinding | |||||||||||||
| Honing | |||||||||||||
| Electro-Polishing | |||||||||||||
| Polishing | |||||||||||||
| Lapping | |||||||||||||
| Superfinishing | |||||||||||||
About Us
Advanced Integrated Technologies is essentially a manufacturing service company with two major divisions. The resistance welding and reflow soldering tool division grew out of our early work building micro tools for Hughes Aircraft. About the time that Microsoft was turning computers into a household item, computer hardware manufacturers were looking for companies to build reflow tools used in the assembly of hard drives and other components.
Get in touch
Address: 361 Industrial Drive, Mountain View, AR 72560
FAX: +1 888 495 5116