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The results indicate that a piece of sheet metal
needs an arc on one side of approximately 15
and an arc of 9
⁄
" on the other side, as shown in
7
16
Figure 42.
15
11
⁄
16
9
7
⁄
" Circum.
16
Figure 42. Example of calculated arc
circumferences from known diameters.
RadiusH
Next we need to figure out the radius height.
RadiusH=√(ConeH)² + (LargeD/2-SmallD/2)²
RadiusH=Flat Workpiece Height
(Width of Material Needed between Two Arcs)
LargeD=Large Diameter
SmallD=Small Diameter
ConeH=Finished Cone Height
RadiusH
Figure 43. Radius height of flat workpiece.
-28-
11
" Circum.
Radius height differs from the actual cone height
⁄
"
because, as you can see from Figure 44, the
16
radius height is not 90° in relation to table or floor.
RadiusH
Figure 44. Difference between radius height and
Suppose the cone in the previous example has
a height of 6". To find the radius height of the
cone, you would use the radius height formula as
follows:
RadiusH=√(ConeH)² + (LargeD/2 - SmallD/2)²
RadiusH=√6² + (5/2 - 3/2)²
RadiusH=√6² + (2.5 - 1.5)²
RadiusH=√6² + 1²
RadiusH=√37
RadiusH=6.083
⁄
5
RadiusH=6
The results indicate that the piece of sheet metal
needs a radius height on either side of approxi-
mately 6
⁄
" (see Figure 45).
5
64
6
5
⁄
"
64
Figure 45. Example of calculated radius height
from known diameters and overall cone height.
overall cone height.
"
64
Model G0971 (Mfd. Since 11/23)
ConeH
6
5
⁄
"
64
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