Cylinder-to-Cylinder (CYCY) first created 27/12/06 - last modified 7/09/08 Page Author: Ty Harness
News Beta version available for full version users of the 4 main software applications in the members area
The right tee piece can be described by the RTY software which is really a mitring exercise and the CyCy application can also produce a T by setting the main to branch angle as 90 deg (or -90 deg) as shown in figure1. RTY produced a symmetrical Y piece but CyCy will produce the oblique Y as shown in figure 2.

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Figure 1 - CyCy application can also produce a right T using pipes of the same diameter




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Figure 2 - The oblique Y piece.


When the main and branch pipes are of equal diameter as in figure 1 and 2 the front elevation show the joint lines are straight where this is a true characteristic of a cylinder to cylinder intersection which makes it a simpler drawing exercise compared to pipes of unequal diameter.

Now we need to consider pipes of different diameter (normally the connecting branch is smaller than the main). Figure 3 shows a tee connection with a smaller diameter branch pipe and note the central axes of the pipes are inline.
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Figure 3 - T connection of pipes of different diameter


Because the diameter of one pipe is smaller we can now offset the central axes. Figure 4 shows the offset to throw the branch off the main tangentially. Figure 5 also illustrates the offset using CyCy 3D DXF export.

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Figure 4 - T connection but the smaller diameter pipe offset central axes
Figure 5 - Cylinder 3D DXF Export


There's no reason why we can not extend the mathematics to find a cylinder intersecting a cone or a cone intersecting a cylinder as shown in figures 6 and 7 respectivley.

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Figure 6 - A cylindrical branch intersecting a right cone.


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Figure 7a, b - Right cone intersecting with a cylinder at an oblique angle




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Figure 8 a,b,c - Cone to Cone Intersections


Figures 8 a,b and c shows the 'all time' classic show piece that many City and Guilds apprentices will have attempted at night school. Take a look at the following PDF to see what parameters CyCy are used to produce figure 8.

Cone through a cone PDF file.