Surface Roughness of Manufacturing Processes

Process	Typical Ra (μm)	Typical Ra (μin.)
Grinding	0.2 - 1.6	8 - 63
Milling	0.4 - 6.3	16 - 250
Turning	0.8 - 6.3	32 - 250
Polishing	0.1 - 0.8	4 - 32
Drilling	1.6 - 12.5	63 - 500
Electro-Discharge Machining (EDM)	1.6 - 12.5	63 - 500
Honing	0.1 - 1.6	4 - 63
Lapping	0.025 - 0.1	1 - 4
Casting (Sand)	12.5 - 25	500 - 1000
Casting (Die)	1.6 - 6.3	63 - 250
Forging	3.2 - 25	125 - 1000
3D Printing (Additive Manufacturing)	6.3 - 25	250 - 1000
Shot Blasting	6.3 - 12.5	250 - 500

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