Machinery's Handbook, 31st Edition
Designing Sheet Metal Parts for Production 1405 Table 2. Minimum Distance between Punched Opening and Edges and Rounded Radius
Form of opening
Part is
Minimum Distance
Sketch
. c T r $ $
c
Circle
T 05
c
c
c
c
Blanked
. . 12 05
c r
T T
Rectangle
$ $
c
r
T
c T 2 $ . T 05 10 $ − ^ h a . . T 10 20 $ − ^ h b . . . T 20 30 $ − ^ h c
h
T
r r r
Bent
Circle
c
T
r
c
c
d
r 1
. d d r D d r D D T d c r T 2 2 3 05 1 1 1 1 # $ $ $ − − + + + ^ ^ ^ h h
d
r
Drawn
Circle
h
2
D
D
d 2
a Al and brass b Steel c Al-alloy 6000 series Design rules for parts produced by bending: Minimum bend radius should be used only if it is necessary for correct function of part. The bend radius should be larger than the thickness of the material. Use minimum distances between punched opening and bend radius given in Table 2. Flange length as shown in Table 2 needs to be h ≥ 2 T . If a part has more than one bend, it is necessary to define technological data.
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