Surface Finish Help

[jeremyray25]

I am reviewing a print in which the surface finish is called out with a check mark like normal; however above the check mark is 18Z. I need to know what the "Z" stands for. Is this a unit of measure, similiar to micro-inch/micro-meter or a parameter similiar to Ra? I can tell you that I found this on a Japanese automotive print if that helps.

Thanks,

jeremy

 

[fcsuper]

Is this a CAD drawing? It may actually be a typo of some sort.

Matt
CAD Engineer/ECN Analyst
Silicon Valley, CA
sw.fcsuper.com
Co-moderator of Solidworks Yahoo! Group

 

[saberblue]

There is a Rz DIN method of measuring surface finsih - it is based on a DIN spec. (DIN 4768). Never been envolved with this but the above is what my handy dandy cheat sheet tells me

Found this on the WEB it may be more than you need but here is a place to start

http://xnet.rrc.mb.ca/leonf/reports/Bourget (SurfaceFinish_Report)/SurfaceFinish_Report.doc