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Fab Academy 2014,
Masato Takemura

Weekly Assingments


Class7: Computer Controled Machining
March 12th,2014

Memo

This week I'v learned about computer controled machining.

Assignment


This week's assignment is to make somethig BIG!!

Make something BIG !!

I decided to remake old sink I've used in my lab.


fig.1 guinea pig: old sink unit

First, I measure the scale. It was difficult when I measure aroud the drain pipe.


fig.2 memo of scale

Second, I draw a sketch.


fig.3 sketch of idea

Then I considered that what design tool do I use. I chose Rihnoceros as a modeling tool in this time. Because I wanted to learn the Rihnoceors.
And I made a model of old-sink unit.


fig.4 model of old sink unit

I began to draw my idea. I felt difficult when I use a tool of writing curve.


After I made a model of my idea, I made them into 2D. I used a Rihnoceros command "MAKE2D". It is very usefull command.


fig.5 model of old sink unit

However...a 2D data made by Rihnoceros command "MAKE2D" has little problem. Some lines are not connected. Or Some line was piled up. So I cleaned up by the Illustrator.

I use two function of Illustrator, "SPLIT" & "MERGE". After you choose objects that is splited or piledup, you push "split" then "merge". It will be merged as a closed line.


fig.6 menu of illustrator, "Pathfinder"

Convert AI data to G-code

I used a software V-curve Pro. That can add dog bone-hole or T bone-hole. And we can determine the any options, value, condition... for control ShopBot.

Work Flow


fig. window of V-curve Pro

Control ShopBot

I used ShopBot for cutting. It's first time for me to use it.


fig. ShopBot


fig. GUI for control ShopBot


fig. parts I cut out




fig. completed


[My failure 1]

I broke 2 endmills... It's cost over $400. OMG!!
Broken endmills broke my heart...


fig. broken endmill

Endmill shot the head of screw. But I didn't understand why screw located on the way of endmill...because I located screws by checking on the display, V-curve. First, I fix the data and re-generated ShopBot data. But I broke endmill again... The cause is my misstake when I added hole for fix boads by V-carve. Maybe my date had any noise. So I selected extra dot when I chose holes on GUI. Then V-curve detect the extra dot and decision as a hole.

[My failure 2]


fig.


[Reference]
  1. Hiroya Tanaka Laboratoly's page
    2. explain how to use ShopBot(Japanese)
    http://fab.sfc.keio.ac.jp/lab/?p=3624に