Cylinder-to-Cylinder (CYCY) first created 27/12/06 - last modified 09/05/12 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 shows the joint lines are straight where this is a true characteristic of a cylinder to cylinder intersection which makes it a simpler drawing exercise as 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 4a shows the offset to throw the branch off the main tangentially. Figure 4b 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 4b - Cylinder 3D DXF Export


Sometimes the branch can be small compared to the main and perhaps you need an internal branch connection as shown in figures 5a and b. Figure 5a and b show a stove chimney flashing where I needed to pass a chimney through the curved roof of a caravan. The roof became the main pipe where I found the radius using a cardboard template as shown in 5e.

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Figure 5a - Branches cut out with a jigsaw. b)The main cylinder holed with a jigsaw






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Figure 5a - Branches cut out with a jigsaw. b)The main cylinder holed with a jigsaw.




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Figure 5c - Assembly of the internal branch. d)External branch shown fully welded. e)Clean and ready to go.




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Figure 6 - Cylinder intersecting a cone


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 7 and 8 respectively.

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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.