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Common
Shapes
Type
A:
Shallow cylindrical bend; arc not to exceed 58
degrees
Type
B:
Cylindrical bend; arc exceeds 58 degrees but not
90 degrees
Type
C:
Curve-plus-tangent with curve limited to 60 degrees.
Tangent may not constitute more than 1/3 of the
total girth
Type
D:
Curve-plus-tangent with curve not exceeding 38-1/2
degrees of arc. Tangent may not exceed the arc
Type
E:
Curve-plus-tangent type has a tangent not more
than twice the curve and curved portion not exceeding
90 degrees of arc
Type
F:
Curve exceeds 90 degrees but not 128 degrees
Type
G:
Non-circular curve. Shape is that of a shallow
letter "S"
Type
H:
Central curve flanked by tangents which may be
equal or unequal. The curve may not exceed 90
degrees, and both tangents together in length
may not exceed 1/4 the total girth
Type
J:
Tangent-plus-arc-plus-tangent; curve 90 degrees
or less, the tangents together, equal or unequal,
not to exceed 3/4 of the total girth
Type
K:
Curve exceeds 128 degrees but not 180 degrees
Type
L:
Two curves of like radius and each not exceeding
90 degrees with a common tangent between them
Type
M:
Deep-curve-plus-tangent; curve will exceed 90
degrees of the arc
Types
of Edgework
Seamed, pencil ground, pencil polished, flat ground
with chamfer, flat polished with chamfer.
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