210 Machine Drawing
dharm
d:\N-Design\Des15-1.pm5
Fig. 15.2
Degree of accuracy expected of manufacturing process
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
25
50
75
100
2500 1250 500 250
50 25 5 0
m Tolerance, m
Diameters (mm)
Tolerance
grades
16 Sand casting (approximately);
flame cutting
15 Stamping (approximately)14 Die casting or moulding; rubber
moulding
13 Press work; tube rolling12 Light press work; tube drawing11 Drilling, rough turning and boring;
precision tube drawing
10 Milling, slotting, planing, metal
rolling or extrusion
9
Worn capstan or automatic,horizontal, or vertical boringmachine
8
Centre lathe turning and boring,reaming, capstan or automatic ingood condition
7
High quality turning, broaching,honing
6
Grinding, fine honing
5
Ball bearings, machine lapping,diamond or fine boring, finegrinding
4
Gauges, fits of extreme precision,produced by lapping
3
Good quality gauges, gap gauges
2
High quality gauges, plug gauges
1
Slip blocks, reference gauges