Charmilles surface finish 42 Charmilles surface finish 42 PAZMAN (Mechanical) (OP) 16 Nov 15 16:23 Hello, How to I achieve a surface finish of Charmilles 42. Need advise on how much stock to leave on the surface that is to be EDM machined. Thanks in Advanced, Paul RE: Charmilles surface finish 42 capnhook (Marine/Ocean) 19 Nov 15 11:31 You should leave just enough stock so that you can obtain a surface finish of Charmilles 42, but not too much more, or it will take you all day. Proud Member of the Reality-Based Community.. To the Toolmaker, your nice little cartoon drawing of your glass looks cool, but your solid model sucks. Do you want me to fix it, or are you going to take all week to get it back to me so I can get some work done? RE: Charmilles surface finish 42 moon161 (Mechanical) 24 Nov 15 02:10 Lacking particular knowledge, I would say it depends on the depth of the machining marks of the previous process. http://www.finishing.com/149/38.shtml By this chart, it looks like a 63 micro inch, which is not rocket surgery, milling, turning or grinding will get you there. I'd still talk to the people who will be finishing the part for you.