AutoCAD Tee Program

General Program Information

Input Definitions

Inputs Needed to Call the Tee Function

origin - A 3*1 matrix with x,y,z positions corresponding to the point where the tee will be drawn.
ND - The nominal diameter of the pipe. This value along with the pipe schedule is used to determine other actual dimensions of the tee.
R1 - The inner radius of the main pipe.
R2 - The outer radius of the main pipe.
R3 - The outer radius of the sockets of the tee.
L - The length of the skinnier pipes of the tee.
H - The length (or depth) of the sockets of the tee.
EN- The enumerated pipe schedule type. Each schedule of pipe is represented by a specific number within our code.

Inputs Defined within the Tee Function

p1 =

• x : origin₀
• y : origin₁
• z : origin₂

p2 =

• x : origin₀
• y : origin₁
• z : origin₂ + L/2

p3 =

• x : origin₀ + innerD(ND, EN)/2
• y : origin₁
• z : origin₂ + L/2

p4 =

• x : origin₀ - R1
• y : origin₁
• z : origin₂

p5 =

• x : origin₀ + L/2
• y : origin₁ + R1
• z : origin₂ + L/2

p7 =

• x : origin₀ - R3
• y : origin₁
• z : origin₂

p8 =

• x : origin₀ - R1
• y : origin₁
• z : origin₂ \

p9 =

• x : origin₀
• y : origin₁ - H
• z : -origin₁ - R3

p10 =

• x : origin₀
• y : origin₂ + L/2

p11 =

• x : origin₀ + zc
• y : origin₂ + L/2 - zc

p12 =

• x : origin₀ + zc
• y : origin₂ + L/2

ND

R1

R2

R3

L

H

win1 =

• x : origin₀ - (L/2 + H)
• y : origin₁ - R3
• z : origin₂

win2 =

• x : origin₀ + (L/2 + H)
• y : origin₁ + R3
• z : origin₂

EN

Note: zc corresponds to the zoom constant used within AutoCAD, defined by the basics file.

Technical Program Outline

Note: All coordinates are referenced in top view in the program unless otherwise specified

zoom_win- zooms on a window space directly around where the tee is to be drawn.  The points win1 and win2 are used to select this window size, based on including the space of the tee and a zoom constant (zc) to ensure the entire drawing will be within the frame.

zoom_win <-- zoom_wina(win1,win2)

win1 =

• x : origin₀ - (L/2 + H)
• y : origin₁ - R3
• z : origin₂

win2 =

• x : origin₀ + (L/2 + H)
• y : origin₁ + R3
• z : origin₂

cylinder1 - creates a cylinder with length 'L' that comes out of the page.

cylinder2 - creates a cylinder with length 'L/2'.

union1 - unions the two cylinders.

cylinder3 - creates a cylinder with length 'L'.

cylinder4 - creates a cylinder with length 'L/2'.

Unable to render embedded object: File (tee subtract1 subtract2.JPG) not found.

subtract1 - subtracts the portion of cylinder2 and cylinder4 that are inside the cylinders creating a hollow pipe out of cylinder2 and cylinder4.

subtract2 - subtracts cylinder 3 from cylinder 1 creating a hollow pipe coming out of the page.

Unable to render embedded object: File (tee H pipe.JPG) not found.
tee viewed from viewfront

cylinder5 - creates a cylinder with a depth 'H' and radius 'R3' into the page.

cylinder6 - creates a cylinder with a depth 'H' and radius 'R1' into the page.

subtract3 - subtracts cylinder 6 from cylinder 5 creating a hollow pipe with length 'H'.

viewfront - sets the workspace so that the user is viewing the object from the front.

Unable to render embedded object: File (tee mirror dimensions.JPG) not found.

zoom _win1 - zooms the workspace to a focus area 

mirror1 - mirrors the bottom pipe 90 degrees clockwise.

mirror2 - mirrors the bottom pipe 180 degrees.

bigunion1 - joins all four pipes.