0. Assignments for wk7

The assignments for wk7 were as below;

  1. Make something big (on a CNC machine).

1. Practice - Design Test

Machine set up of Shopbot

Below is the set up process of 2D cutting on Shopbot:

  1. Prepare the design files and move them to the laptop on Shoobot.
  2. Set the material on the sacrificial layer, fixing with enough number of volts.
  3. Choose correct end-mill. If not, noisy sounds will be occurred by machine, you have to choose appropriate end-mill, cosidering the softness and thickness of the material.
  4. On Partsworks 2D, which is the supporting software to prepare the cutting blueprint, read the design file and set the cutting path to tool path on supporting software. And save it as another file. You can also add tabs to each cut parts.
  5. Open Shopbot3, which is the software for controlling Shopbot, and read the saved file above. Before cutting, you have to set origin of x and y and z axis.
  6. After setting, you can start to cut. Duting cutting process, you have to pay attention to machine and check if the cutting procceed without problems.

A. Fixed Test

To begin with, I would like to check what width and thickness of the fixed point is suitable, so I made the file as below.

Fixed point test
Download PDF file

From the result, I found that 9mm(just same as the width of parts) is the best width to fix each parts.

9mm is the best

Also, I tested the suitable width of putting the parts. I found that the best width to fix is also same as the joint part.

Also, this test showed the limitation of proximity of each cutting lines as below.

B. Pattern Test

Next, I would like to somthing bending, then I tried some patterns which seemed to be bended as below.

During this process, I refered the sites;

Download DXF

Then, I started to cut, however, the problem has occured. The problem was that I forgot to put tabs on eliminated parts, so these parts moved around and the end mill cut wrongly as below.

From this test, I could testified the bending of each patterns.

2. Practice - Table

Designing the blueprint

I felt like to make somthing useful for me, so I decided to make the table which can be used when I sitting the chair in my room as below.

First, I drew the blueprint using Fusino 360 because it is rich in support functions for drawing blueprints.

Download DXF file


Then, I cut the parts. I used the seting as below when I cut the blueprint;

  • End mill: 3mm
  • Feed speed: 70mm
  • Turn over: 3.2

After cutting, I found one problem. It was not cut cleary because the plywood board was not fixed to sacrificial layer tightly. Then I had to eliminate the unnecessary parts using sand papers.

Next, I used sand paper and varnishing to polish the sarfase.

varnishing to polish


Then, I succeeded to make the table. As a refrection, I had to add more fixed bridges under the top surfase because the fixness of the table was a bit looth.

Computer-controlled cut table

Outline of this page

1. Practice - desing test
2. Practice - table
3. Practice - basket

Download output of Wk7

Here are my output files for week7:

Lecture Material for Wk7

Lecture Note


Learning Support

Videos of Wk7

Here you can find this weeks's lectures on VIMEO:


  • Lesson-07: Computer-Controlled Machining
  • (2016.03.16)

    Checklist for Wk7

    • Make something big (on a CNC machine).
    Learning outcomes:
    • Document the process of design and production to demonstrate correct workflows and identify areas for improvement if needed
    Have you:
    • Explained how you made your files for machining (2D or 3D)
    • Shown how you made something BIG (setting up the machine, using fixings, testing joints, adjusting feeds and speeds, depth of cut etc)
    • Described problems and how you fixed them
    • Included your design files and ‘hero shot’ photos of final object