3. Computer controlled cutting

For this week assignment, I designed a carlender that we can use as a signboard or pen stand.

3-1. Learning how to design parametric models with Fusion 360.

I practiced making parametric models with fusion 360.
We can change all pameters of 3d models we designed easily in the software.
We can see the parameter list from : model >> modify >> change parameters
good reference : making parametric models in fusion 360

this is the parameters box

I set “user parameter” as follows

      ・mt >> material thickness : The cardboard I used is 5mm
      ・t1 >> material thickness - laser width
      ・lw >> laser width:
      ・l1 >> length of small part
      ・l2 >> length of long part
      ・h1 >> height of small part
      ・el >> length from edge : I use it to adjust the position of the joint.

3-2. test cutting

 

I needed to search the laser beam width in order to make “press fit” kit. Laser beam width is determined by material properties and thickness and the focus length of the lens. So test cutting is very important !! I cut test parts with changing “lw: laser cutter width” parameter between 0.1 and 0.3 .
Finally, I decided to use 0.2mm.



I used a lasercutter Trotec Speedy 300 (80W) at Fablab DAZAIFU where I work.
Lasercutter setting is
      ・speed : 55
      ・power:1.5
      ・Hz : 1000
      ・lens is 2.0 inch

3-3. planning to make

I am interested in "OKAWA KUMIKO” that is japanese tranditional handcraft in Okawa, Fukuoka Prefecture, Japan. " Kumiko " is one of the joinery techniques assembling wood without nails . Additionally, I would like to make the puzzle calendar that is functional and fun. So I made a calendar with “kumiko” techniques.

OKAWA KUMIKO Puzzle carlender

3-4. Making a 2D drawing from 3d models

I designed two blocks. The left has length 100mm. The right has length 50mm.

I created the drawing of the models from "2D Drawings from Fusion 360 Models" and exported as PDF.

Next, I imported the file to Adobe illustrator is 2D drawing software and made some parts of the carlender : month, days and number

Finally, I cut it with lasercutter. It took about 10 minutes.
Download : carlender.ai/carlender.dxf

3-6. Troubles

I had two troubles in this week assignment.

    1. The cardboard often burned while the machine cut it.
    2. The blocks I made is very fragile.
The solution : I tilted the cutting pattern to across the flute orientation and cut it.