Surface Roughness Produced by Different Manufacturing Process

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.

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