Sheet Metal Surface Finish Symbols

Surface finish roughness casting die casting good 1 2µm investment good 1 5 3 sand casting poor 12 25 metal forming cold rolling good 1 3 hot rolling poor 12 25 machining boring good 0 5 6 drilling medium 1 5 6 milling good 1 6 turning good 0 5 6 abrasive processes grinding very good 0 1 2.

Sheet metal surface finish symbols.

Two of the most important are the height of the roughness peaks and their separation often referred to as ra and d. 80 2 satin sheet 70 max. Ra roughness average is the main height as calculated over the entire measured length or area. Of indicating surface roughness through triangle symbols is now superseded however still many companies are following the older practice.

Used when surface finish can be produced by any convenient technique. 150 4 3a sanitary finish 42 max. Buff 100 20 30 200 220 4s biothech finish 25 max. Standard symbols v basic symbol.

Two of the most important are the height of the roughness peaks and their separation often referred to as ra and d. Ra and d are two important surface finish parameters. For 2 dimensional computation. Below is the comparison table for all 3 ways of indicating surface roughness symbol in the drawing.

Ra and d are two important surface finish parameters. Finish done by a machining process. A surface finish chart is a handy reference tool for characteristics such as measurement units and typical ra values according to the metal cutting method used. 15 20 34 25 max.

Roughness value ra µm roughness grade number roughness symbol 50 n12 25 n11 12 5 n10 6 3 n9 3 2 n8. The surface finish units we would use for parameters like ra would be either micro inches english or imperial or micrometers metric. 30 35 ansi 4 sanitary finish 32 0 8 126 3 2 n6 180 4 30 max. Request a quote 973 239 1100.

The quality of a surface finish on a metal surface produced by production method other than machining is shown on the drawing by a tick symbol as shown in fig a. Ra 1 n sum abs zi zmean from i 1 to n rms is a root mean squared calculation. 42 47 46 max. It is quoted in micrometers or micro inches.

Indicating a surface finish without removal of material for example quality of an initial casting. Symbols for indicating surface finish. The surface finish units we would use for parameters like ra would be either micro inches english or imperial or micrometers metric. Roughness value chart 3 a l 50 rough oxy cut.