Creating Cones - Grizzly T32718 Owner's Manual

Creating Cones

Bending cones requires more advanced equa-
tions and techniques than cylinders. The following
section explains the basic principles for bend-
ing a truncated, concentric cone. If you require
information for bending more complicated cones,
please consult outside training, books, and other
research.
Similar to the process for bending cylinders, if
you know the two diameters and the height of the
cone you want to create (see Figure 31), you can
use those values to determine the dimensions of
the initial, flat workpiece before bending.
Figure 31. Example of known cone dimensions.
The Model T32718 can bend cylinder and cone
diameters as small as 3" due to the roller size, so
both diameters of your cone must be larger than
3" to be bent on this machine. Since a "true" cone
requires one of the diameters to equal 0", figures
and steps in this section refer to a "truncated
cone", or a cone lacking an apex whose top is
parallel to the base (see Figure 32).
Truncated Cone
Figure 32. Example a truncated and a true cone.
Model T32718 (Mfd. Since 07/21)
True Cone
There are 5 values you will need to calculate in
order to cut a flat workpiece that will bend into
a functional cone: LargeC, SmallC, RadiusH,
TConeH, and TConeRadiusH.
LargeC and SmallC
Use the following formulas to calculate the
circumference of both cone openings.
LargeC=πLargeD,
SmallC=πSmallD
LargeC=Large Circumference
(Arc Length of Material Needed at Larger End)
SmallC=Small Circumference
(Arc Length of Material Needed at Smaller End)
π=Pi (Approximately 3.14)
LargeD=Large Diameter
SmallD=Small Diameter
Large Circum.
Small Circum.
Figure 33. Location of small and large
circumference of flat workpiece.
Example: Suppose you want to create a cone
with a 5" diameter at one end and a 3" diameter
on the other end. You would use the circumfer-
ence formulas as follows:
π
LargeC= LargeD
LargeC=3.14 x 5"
LargeC=15 ⁄ "
11
16
π
SmallC= SmallD
SmallC=3.14 x 3"
SmallC=9 ⁄ "
7
16
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