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• # Geometry. Three-spoke dovetailing tile tessellation. "Trispokedovetile"?

Discussion in '2D drawings gallery' started by Peter Dow, Nov 18, 2016.

1. ### Peter DowWell-Known Member

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I've posted this image which I've described as a
"Three-spoke dovetailing tile tessellation".

Trispokedovetile tessellation
by Peter Dow, on Flickr

which is a tessellation of this tile shape,

Trispokedovetile
by Peter Dow, on Flickr

Check my Flickr page for the preceding design iterations and inspiration.

I've named the shape
Trispokedovetile
which is a contraction of "tri-spoke dovetailing tile".
• "tri-spoke" because the shape is similar to a 3-spoke motorcycle wheel with three bites taken out of it.
• "dovetailing" because the tiles interlock like a dovetail joint

But it is quite possible this shape is already known to geometry and already has been named.

Do you know if this shape has already been named? If so please do reply to tell me what the name is.

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3. ### Peter DowWell-Known Member

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Trispokedovetiles Animation Webpage

I've programmed a webpage using Javascript to display an animation which shows a range of different trispokedovetiles, each of which can be specified by a "CIRCLE" percentage, which is the ratio as a percent of two parameters -

1. A "HEXAGON" parameter length - always nominally "100%"
2. A "CIRCLE" parameter length - the animation varies this between 100% and 135%, though up to 150% is possible in theory.

So you can specify the "CIRCLE" percentage to specify a particular shape of trispokedovetile.

A still image from the animation is attached - showing trispokedovetiles with "CIRCLE" = 125%.

I've tested the animation in Chrome and Internet Explorer browsers and it works fine for me.

But it is not working in Firefox for some as yet unknown reason.

Let me know by replying here if you have any other problems with the animation not displaying for you.

Last edited: Jul 1, 2017
4. ### Peter DowWell-Known Member

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Tutorial on how to produce 3D images from my trispokedovetiles webpage

Step 1.

Create a line image using my webpage, this is for CIRCLE = 120. Right click save image as.

Step 2

Use an image editing program such as paint.net

Crop the image to suit and use the paint bucket tool to fill the tiles you want to make 3D with another colour, I chose red.

Step 3

Use the magic wand tool with option flood mode global to select all the red area and then copy and paste the red area into a new image

Step 4

Use paint bucket tool to colour the tiles black

Step 5

Upload the black and white image to selva3d.com with option "Logo/text", adjust the height and rotate the image to suit and right click to save the image.

Last edited: Jul 1, 2017
5. ### Peter DowWell-Known Member

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Now to consider the important issue of interlocking trispokedovetiles against movement in the direction normal to the tiled plane, which for the application of tiled armour would be the normal to the armour surface, in the direction of a bullet's path.
BILAYER TRISPOKEDOVETILES
I propose that the unit armour tile be comprised of 2 joined trispokedovetiles with matching HEXAGON parameters but each with a different CIRCLE percentage.

For example, suppose we choose trispokedovetiles with CIRCLE = 100% and 121%.

The reason for choosing C100 for the outer layer of the armour is because its 120 degree angle corners would be more robust.

The reason for choosing C121 for the inner layer of the armour is because CIRCLE = 121% offers the largest percentage where the neck attaching the outer part rings is at least twice the thickness of the ring, attempting to balance the robustness of the ring parts to the robustness of the neck versus tensile stresses.

Stacking and joining those together forms a bilayer trispokedovetile, "C100+C121".

Drawing the 2 layers semi-transparently we can see how the bilayer trispokedovetiles would interlock in the normal to the plane.

2/3rds of the tiles can be slotted together, either the yellows and the blues or the yellows and the purples or the blues and the purples.

However the final 1/3rd of the tiles would not simply slot in and would have to be inserted by joining the two halves of the bilayer trispokedovetile in situ.

Last edited: Nov 30, 2016
6. ### Peter DowWell-Known Member

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Last edited: Jul 1, 2017
7. ### Peter DowWell-Known Member

Joined:
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Posts:
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Last edited: Jul 1, 2017
8. ### Peter DowWell-Known Member

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TRISPOKEDOVETILES ROUTER CUTTING

My trispokedovetile CAD-CAM webpage now offers an (X,Y,Z) option for router cutting using rotary tool paths between spaced out tiles -

I've simulated the CNC router code -

Last edited: Jul 1, 2017