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**1. Select Hub Size:**
**Select "No Hubs"** to get the true "chord" length for each strut, which is the full distance for the strut between each geodesic sphere vertex.

For most sphere construction methods, you will use the "No Hubs" selection.

With our Zip Tie Domes Hub Design, the geodesic sphere vertex is located in the middle of our "Center Ring".

When using our Hubs, the width of our Center Ring must be added to the strut length to give the true geodesic sphere dimensions.
**Select Standard 4" Hubs** for calculating domes with our 4" Standard Hubs or Dual Covering Hubs, which have a 2.375" Center Ring. These hubs are used with 1" PVC pipe for struts.
**Select Super 6" Hubs** for calculating domes with our new 6" Super Hubs, which have a 3.5" Center Ring. These hubs are used with 1.5" PVC pipe for struts.
**Select Mega 8" Hubs** for calculating domes with our proposed 8" Mega Hubs, which will have a 4.5" Center Ring. These hubs will be used with 2" PVC pipe for struts.

**2. Feet or Meters**

Click the button for "Meters" if you are using metric measurements.

**3. Data Entry:**

Enter a number with or without a decimal fraction in **any** of the number fields on the left. (For example, enter "5" or "3.3333")

Click the Calculate Button. All of the other numbers will be automatically calculated.
__The Blue Struts are always the longest struts__. If you know your longest strut length, enter your data for the longest strut length in the Blue Strut field.

To build a strong sphere, the longest strut should not be more than 6' long.

**Cost Calculation and Material Utilization Chart**

The default "Length of Pipe" for cutting your struts has been set to 10'. You can change this to 20' or whatever length of pipe you have to cut for your struts.

You can also update the "Cost Per Pipe" amount, and click the Calculate field, and the "Total Cost of Materials" amount will be calculated at the bottom of this section.

If you are cutting 4' struts, consider using 20' lengths of pipe, as there will be less waste as compared to cutting 4' lengths from 10' pipe.

2v Sphere

Length of Pipe:

Cost Per Pipe:

Blue "A" Strut Units Entered:

0

Feet and Inches:

00"

Number of Pipes needed to Create (60) Blue "A" Struts:

0

Number of Blue "A" Struts Produced From Each Uncut Pipe:

0

Waste for First 0 Pipes after Cutting 0 Struts Each:

0 = 00"

<-

Number of Blue "A" Struts Created from the first 0 Pipes:

0

Number of Blue "A" Struts Created from the Last Pipe:

0

Waste on the Last Pipe after Cutting 0 Strut(s):

0

<-

Total Waste in Creating 60 Blue "A" Struts:

0

Red "B" Strut Units Entered:

0

Feet and Inches:

00"

Number of Pipes needed to Create (60) Red "B" Struts:

0

Number of Red "B" Struts Produced From Each Uncut Pipe:

0

Waste for First 0 Pipes after Cutting 0 Struts Each:

0 = 00"

<-

Number of Red "B" Struts Created from the first 0 Pipes:

0

Number of Red "B" Struts Created from the Last Pipe:

0

Waste on the Last Pipe after Cutting 0 Strut(s):

0

<-

Total Waste in Creating 60 Red "B" Struts:

0

Total Waste for All Struts:

0

Number of Uncut Pipe/Materials Needed:

0

Total Cost of Materials @ $4.50 Each:

$

Weight Chart | 1" PVC Sch.40 | 1" PVC Sch.80 | 1.5" PVC Sch.40 | 2" PVC Sch.40 | 3/4" EMT | 1" EMT | 5/8" Iron Rebar #5 | 3/4" Iron Rebar #6 | 1/2" Basalt Rebar #4 | 5/8" Basalt Rebar #5 |
---|---|---|---|---|---|---|---|---|---|---|

Lbs Per Linear Ft | .32 | .41 | .51 | .68 | .435 | .64 | 1.043 | 1.502 | .237 | .46 |

60 Blue "A" Struts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

60 Red "B" Struts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

Total Weight of Struts (lbs) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

Weight of Hubs, Rings, Zip Ties | 14.8 | 14.8 | 36.6 | 65.7 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 | 14.8 |

Total Sphere Weight (lbs) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

(See 2V Manual for Details)

1. Assemble the Foundation Ring.

Top View

Perspective View

2. Lay out the Strut Pattern.

Top View

3. Connect the Struts to

the Foundation Ring.

Top View

Perspective View

4. Attach the Color Coded Hubs.

Attach the Red Hubs

to the Red Triangles.

Attach the Blue Hubs

to the Blue Triangles.

5. Connect the Top of the First Tier

with Red Struts.

Top View

Perspective View

6. Set the Red Struts and

Blue Hubs for the Second Tier.

Top View

Perspective View

7. Set the Blue Struts for the Second Tier.

Top View

Perspective View

8. Connect the Top of the Second Tier

with Blue Struts.

Top View

Perspective View

9. Complete the Sphere with Red Struts.

Top View

Perspective View

Blue "A" Chord Factor: **.61803**

Red "B" Chord Factor: **.54653**

--------------------------------------------

A-A-A Triangle

Altitude Xa | Decimal | 0 |
---|---|---|

Feet and Inches | 0 0" |

A-A-A Triangle Edge |
Measurement | Strut Length |
Center Ring Hub Width |
Triangle Edge Total Length |
---|---|---|---|---|

## A |
Decimal | 0 | 0 | 0 |

Feet and Inches | 0 0" | 0" | 0 0" |

Surface Area for Each A-A-A Triangle | 0 Square |
---|

B-A-B Triangle

Base = "A"

Base = "A"

Altitude Xa | Decimal | 0 |
---|---|---|

Feet and Inches | 0 0" |

B-A-B Triangle

Base = "B"

Base = "B"

Altitude Xb | Decimal | 0 |
---|---|---|

Feet and Inches | 0 0" |

B-A-B Triangle Edge |
Measurement | Strut Length |
Center Ring Hub Width |
Triangle Edge Total Length |
---|---|---|---|---|

## A |
Decimal | 0 | 0 | 0 |

Feet and Inches | 0 0" | 0" | 0 0" | |

## B |
Decimal | 0 | 0 | 0 |

Feet and Inches | 0 0" | 0" | 0 0" |

Surface Area for Each B-A-B Triangle | 0 Square |
---|

This Sphere Calculator was written in November 2017

by johnhurt.com

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*Alba gu bráth - Scotland Until Judgment*

"O, wad some Power the giftie gie us

To see oursels as others see us!

It wad frae monie a blunder free us,

An' foolish notion.

What airs in dress an' gait wad lea'e us,

An' ev'n devotion!"

Robert Burns - 1786