Hi, Please find below.   Surface Roughness Produced by Different Manufacturing Process Knowing what manufacturing process can produce surface finishes that desired on a surface can be an added advantage while making the designs. Here is a table showing maximum and minimum Ra values can produced on each production methods.     Process Roughness Average, Ra – Micrometers μm Maximum Minimum Flame Cutting 25 12.5 Snagging 25 6.3 Sawing 25 1.6 Planing, Shaping 12.5 1.6 Drilling 6.3 1.6 Chemical Milling 6.3 1.6 Elect. Discharge Machining 4.75 1.6 Milling 6.3 0.8 Broaching 3.2 0.8 Reaming 3.2 0.8 Electron Beam 6.3 0.8 Laser 6.3 0.8 Electro-Chemical 3.2 0.2 Boring, Turning 6.3 0.4 Barrel Finishing 0.8 0.2 Electrolytic Grinding 0.6 0.2 Roller Burnishing 0.4 0.2 Grinding 1.6 0.1 Honing 0.8 0.1 Electro-Polish 0.8 0.1 Polishing 0.4 0.1 Lapping 0.4 0.5 Super Finishing 0.2 0.025 Sand Casting 25 12.5 Hot Rolling 25 12.5 Forging 12.5 3.2 Perm. Mold Casting 3.2 1.6 Investment Casting 3.2 1.6 Extruding 3.2 0.8 Cold Rolling, Drawing 3.2 0.8 Die Casting 1.6 0.8 Above high and low values are typical for each production methods. But values other than high and low Ra can be obtained under special conditions for each process. Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Fri, 8/19/11, vaibhav Joshi <vnjoshi.leo@gmail.com> wrote: From: vaibhav Joshi <vnjoshi.leo@gmail.com> Subject: [MW:12270] Material processing and Surface Finish in Ra To: materials-welding@googlegroups.com Date: Friday, August 19, 2011, 12:57 PM Dear all, can any one tell me avg surface roughness value in Ra with respect to material processing ( Grinding ,Machining, etc) ? Regards, Vaibhav Joshi      rr -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.