07. COMPUTER-CONTROLLED MACHINING

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Assignment

Make something big (on a CNC machine).

Lecture

text/video

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IDEA

Egg style Lampshade/Shelf

This week I would like to make an egg shaped shelf/lampshade for my room interior.

Material

We had 2 of 900 x 1800mm 9mm thickness OSB boards.

Digital Making

First, I wanted to have a natural shape of an egg. I took a picture of an egg in my fridge.

Autodesk Fusion360

I imported the picture of the egg with Fusion360 and took outline. I did "Offset" command to make smaller oval.

Then I did "Revolve" commnad to get solid egg shape with a space inside.

Get the Fusion360 file

Autodesk 123D Make

I used Autodesk 123D Make for making 2D data from 3D data. I imported the .stl file which is exported from Fusion360.

Settings:

set Units to "mm" in Object Size

choose "Radial Slices" in Construction Technique

set Method as "By Count",1st Axis=4, Radial=6 in Slice Distribution

Download 123D make file

illustrator

After get the exported layout file from 123D Make, I changed the layout of all parts to fit in the one OSB board.

Download illustrator file

CAM: V curve

V curve is the CAM software I used.

Procedures:

set the right material size.

set offset: I set offset as 0.2mm

make dogbone fillets

make hole milling

make pocket making

make cutout

check the preview how it goes and if it's OK, save the hole and poekct and cutout files as .sbp which is the files for shopbot.

Download .sbp file

Download Vcurve file

Analog Making

ShopBot

Procedures:

prepare .sbp file from Vcurve.

put material on ShopBot

set the Endmill: this time 6mm downcut endmill was used.

decide XY home position

set auto Z positioning

run hole.sbp to make holes to fix the material on sacrificial layer on ShopBot.

run poekct milling .sbp file

run cutout milling .sbp file

take all parts from the machine clean the ShopBot!

Assembly

First, I sanded the edge of the parts because it had many burr especially at the bottom part. That was because I used downcut endmill.

Trouble

I broke one of the parts when I was asemmnlying all parts with hammering. The cause of the trouble was the offset(0.2mm) was too small. Also, the material was not that strong. So, I changed the offset to 0.3mm and run the shopbot to make the 6 side frames. 0.3mm offset parts were still hard to fix together. However, after 2hours assemblying I finished to make it!

Outcome

Special Thanks!

The Yamaguchi Center for Arts and Media(YCAM) for providing us to chance to use ShopBot

Koki Akiyoshi for ShopBot lecture

Thank you for your support!

Download all files