conventional surface finish? (inverted triangles)

[Shockdesigner331]

Hello all. I've got a question regarding some (actually 2) inverted triangles that showed up on a customer drawing. Now I know that they are surface finish symbols, but I have no idea what the equivalent is in micro-inches. It's two inverted triangles that i really care about, but if you could also tell me what 4,3,1 are it would be appreciated!

 

[scastillo]

Does this answer your question:

http://www.finishing.com/108/67.shtml

 

[FACS]

It sounds like the "E" system, DIN 3141.

thread281-152733

http://mdmetric.com/tech/DINISO2768extract.htm

Charlie

http://www.facsco.com

 

[gearguru]

On the page

http://mdmetric.com/tech/DINISO2768extract.htm

there is an obvious mistake - the values of microfinish are in micrometers, not in millimeters.

 

[Shockdesigner331]

Thanks everybody. FACS, it does look like its the E system. I'm just annoyed that there is no reference as to their dimensioning system on the drawing.

 

[FACS]

Shock,
I bought a book titled "Metric Standards for Worldwide Manufacturing" by Knut O. Kverneland. It's been a great reference for issues such as this.
And yes, it should be in micrometers.


Charlie

http://www.facsco.com