3. Computer Aided design¶

Started trying different design tools.

2D¶

Rhino¶

We had a session on parametric design on 1st of February in our local Fablab. I had to download the latest version of the Rhino software (Rhino 6 for windows). It is free to download and use for 90 days. I downloaded it from the this link Rihno. This version has Grasshopper plugin. We had to install several plugins Lunchbox, Weaverbird, Kangaroo Physics & Meshedit. Then, extracted the plugins in components folder.

Rhino 1

We tried several tools in Rihno & Grasshopper. I tried creating 2D designs by using command or by click on the tool icons. I tried creating a square using command in Rhino

Rhino 4

I tried drawing a wing inside a rectangle using curve tool, then tried to improve the shape by moving the wing points.

Rhino 5 Rhino 6

Then, I duplicated the wing & tried to minimise it’s size by pulling the points.

Rhino 7 Rhino 8

Also, I created a square, then duplicated it then tried rotaing it using the rotate tool. Then, I created a copy of the rotated square and used the scale tool to reduce it’s size.

Rhino 11 Rhino 12

I had some problems when I tried to create several squares inside each other in the sizes that I wanted. So, I created a set of squares inside each other, then copied them & rotated the copied ones.

Rhino 12.2 Rhino 13

Then I used the trim tool to trim some lines.

Rhino 14 Rhino 15

Till I got this resualt

Rhino 16

I tried using the design in the wing & to come up with a different design.

Rhino 17 Rhino 18

I tried to create a better shaped wing, and this is what I came up with. Then I duplicated it & mirrored it to create a butterfly.

Rhino 19 Rhino 20

Rhino 21 Rhino 22

Then,I tried addind some of the previous shapes that I created inside the wing, then I trie to trim & delete some parts but I didn’t like the outcome.

Rhino 21 Rhino 22

File download Rhino (right click + Save link as)

FreeCAD¶

I tried FreeCAD to do parametric press-fit construction kit. It was easier to use than Rihno but I still had difficulties to make the kit.

FreeCAD

First, I tried adding the dimentions in a spread sheet & then use them in graph. Then I created a circle & tried various tools like trim tool, equal tool, create a rectangle & fix radius tool for a circle or an arc

FreeCAD 2 FreeCAD 3 FreeCAD 4 FreeCAD 5 FreeCAD 6 FreeCAD 7 FreeCAD 17

I got some errors in my final sketch, I tried solving them, some of them were solved but not all of them.

FreeCAD 8

Then, I tired with other shapes & ways, but still I didn’t get the result that I wanted.

FreeCAD 9 FreeCAD 10 FreeCAD 11 FreeCAD 12 FreeCAD 13

Then I tried to draw a shape & set it’s sizes & angles but couldn’t get the result I wanted.

FreeCAD 14 FreeCAD 15 FreeCAD 16

Solid Works¶

While I was trying to create the press-fit kit, my friend saw that I was suffering with it, so she showed me how to do it using Solid Works. It looked was much simplier & easier.

Solid works 1 Solid works 2 Solid works 3