Machine Drawing

244 Machine Drawing

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Table 16.1 Surface roughness expected from various manufacturing processes

Sl.

No.

Manufacturing

Process

1 Sand casting

2

Permanent mould

casting

3

4

5

6

7

Die casting

High pressure

casting

Forging

Flame cutting,

sawing & Chipping

Radial cut-off

sawing

Extrusion

Hot rolling

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Hand grinding

Disc grinding

Filing

Planing

Shaping

Drilling

Turning & Milling

Boring

Reaming

Broaching

Hobbing

Surface grinding

Cylindrical grinding

Honing

Lapping

Polishing

Burnishing

Super finishing

Rin ma m

0.0120.0250.0500.100.200.400.801.63.26.312.5 2550 100200

5 50

0.8 6.3

0.8 3.2

0.320.32 2

2.52.5 50

1.6 28

0.160.16 5

6.3 100

1 6.3

6.3 25

1.6 25

0.250.25 25

1.6 50

1.6 25

1.6 2020

0.320.32 25

0.4 6.3

0.4 3.2

0.4 3.2

0.4 3.2

0.0630.063 5

0.0630.063 5

0.0250.025 0.4

0.0120.012 0.160.16

0.040.04 0.160.16

0.040.04 0.8

0.0160.016 0.320.32