Accumet has developed several unique cutting, lapping, and polishing techniques to achieve extremely tight tolerances with repeatability and consistency from piece to piece. Lapping is a process utilized to control the surface finish, thickness identity, parallelism, and flatness of substrates. The process is different depending upon the type of material and the physical dimensions required.
Accumet is capable of achieving thickness tolerances as tight as .0001” and surface finishes ranging from seven micro-inches to 60 micro-inches. Flatness is the other crucial benefit from lapping. Accumet is capable of holding tolerances as tight as 11.6 millionths and delivering substrates in R&D and production quantities. Consistency and repeatability are what we’ve built our reputation on.
The lapping process begins with precision equipment and a well-trained and skilled technician. Material can be lapped down to as thin as .003'' with a tolerance as low as ± .0001''. Materials as large as 16'' square or diameter can easily be lapped. Flatness can be brought to within 0.0005'', depending upon overall size and thickness. Surface finish or average roughness (RA) is achievable anywhere from 5 micro-inches average roughness to 60 micro-inches (RA).
Depending upon the substrate material and customer requirements, different grades of grit, used at several different stages of manufacture are key in achieving quality product on a timely basis. The substrate material, the grit of the abrasive, the lapping technique, and processing time are all contributing factors in achievable parameters.
|Material||Virtually any type|
|Finish||Controlled finishes from 5 micro-inches to 60 micro-inches|
|Thinness Min.||Min. 0.003" up to almost any desired thickness|
|Thickness Tolerance||Tolerances on thickness held as close as ±0.000025" (industry standard tolerance .0005")|
|Flatness||Can be held within the Helium light band range (11.6 millionths of an inch equals 1 band). Industry standard flatness is 0.0005"|
|Parallelism||Can be held within 0.000010" (ten millionths of an inch)|