Create the world's most beautiful bag. Episode 2  Death fight 3D CAD drawing

Last time I wrote about creating a briefcase with an aluminum frame. I shared about how I headed to two small factories introduced to me by the Ota Ward’s
Industrial Plaza (PIO).

I first visited ABC Metal and DEF Case, showing them the illustrations I drew.







Both are local factories with small offices next to their production plants.


      Me
 "(Without any greetings) Actually, I would like you to manufacture this…"

      Factory
"... is this a briefcase?"

      Me
"Yes, the frame is aluminum."


      Factory
 "Made with sheet metal?"

      Me
”Sheet metal? (I realized that I do not understand the manufacturing method well…)
• • • Although I have not confirmed yet, I am sorry if I can tell you because I am lacking in the study including those around. "


      Factory
"Anyway, it is impossible for us to manufacture that.
But, I figured out the image with the illustrations, but are there drawings? "

      Me
"In a drawing? In short, is it enough that described each dimension?"

Factory,  "No, CAD drawing. The factory cannot be made without a CAD drawing."

Me
”(CAD drawing?) • • • • • • • • • • I will be on time again. "
 
The responses from the two factories are the same.
I headed for the bus stop feeling like a loser.


Three things I understood from this occasion.

①  Even if it says simply to make a frame with aluminum, if you do not decide the method, the processing plant will differ in the first place. In the processing of metals, particularly aluminum, there is "sheet metal", "casting (forging)" and "scraping".

"Sheet metal" bends the aluminum plate with hands and machines to make a shape, and fasten the joining surface with screws and rivets. The cost is relatively cheap, but individual differences occur slightly.

"Casting (forging)" is to make a mold with plaster or sand, pour the molten aluminum into the mold, cool it, break the mold and take out the main body.
It costs about 800 thousand type, but the cost of the main body itself is about 80,000 yen. However, the tolerance (gap between the drawing and the actual size) is about 0.3 mm. This method is highly suitable for mass production.

"Scraping (cutting)" cut aluminum blocks one by one with a cutting machine (called a machining center). The finish is far superior, there is also no joining surface. The tolerance is 1 / 1,000 mm and the level of the supernatural work. Mold unnecessary. However, the price is abnormally high. . .

②  A CAD drawing is absolutely necessary.

③  The factory in the Ota Ward named in the world is damn!

In the translation, I hit the wall of the manufacturing from the beginning.
However, because I will not stop, In future orders, I decided on the aluminum manufacturing method, and then I decided to make a CAD drawing.

"Creating the most beautiful briefcase in the world", so compromise is not allowed.
So, the processing method of aluminum frame is not 3 choices, 1 choice.
It is decided by "aluminum scraping out". (Perhaps the world's first at this point)

Next is the CAD drawing.
I downloaded free CAD software from the Web, I bought a book for beginners Amazon, which was delivered the next day. Alright, let's do it.
・・・・・
・・・・・・
I did not understand CAD at all!

I was licking CAD.
If you think carefully, it is a field of professionals where there is a job type called CAD operator.

Still for about two months, I fought with CAD in front of my PC day and night, but at most this degree drawing the square lunch box. Otherwise it is completely useless.
At this pace, I thought the 2020 Tokyo Olympics will come and go, without me making a single CAD drawing. .
It was a waste of time.
I’m quitting! quitting! quitting!

Let's search for experts.
I wonder why I did not go there first.
My habit of trying everything by myself is not good
I wasted two months as well.

I gave up and ask my teacher: Google.
"CAD design consignment" enter!

In conclusion, I hit a few hits, but I hit a page called "It's possible to make it from drawings" mainly because the processing factory is not a pure designer consignment.
However, in this case, once the drawing were made, it must be processed at the factory, and there is no drawing making service for the aluminum scraping factory.

Again, I hit the wall of manufacturing.
(Who and where will write the drawing…)
However, I can’t stop here, so I will consider the production of another part at the same time as finding a place to write a CAD drawing.

It's an opening and a closing knob (lock knob).



Generally speaking of a bag made of aluminum, I recall ZERO HALLIBURTON and RIMOWA.
Or such as equipment case and camera case.
In general, parts that fasten the lid and the case of these bags are often used with latches that are hooked and locked, and push latch that open and close by pushing buttons such as the Attache case.



However, this latch is not very beautiful.
It is rugged itself and the movement of the hand is not beautiful
(I wonder if there are any breakthrough opening and closing buttons…)

Even if I research the department store 's bag department and a wholesale area of Asakusabashi,

I don’t even have an idea.
No matter how many days we search by Google, no idea.
(If it keeps like this, only time will pass with no idea .. )

One day, when I visited Akihabara to see a newly released Gundam Model in a distraction.

I found a showroom where high-end audio is displayed, and I went inside.
Amplifiers etc. are praying horrible prices.

2.5 million! What?

I do not know exactly what is different from tens of thousands of amps, but my eyes went elsewhere.

Volume control knob.

Probably the knob made by cutting out aluminum is treated with beautiful alumite,
At the top of the knob is a diamond cut like the one on iPhone 5.




Deliver a sparkling and beautiful sparkle with the hit of light.
Can this be used as a briefcase opening / closing switch?
Fortunately, here is Akihabara.
I immediately jumped out of the Showroom and went to Akizuki Electronics for electronic components.

I do not know at all what the structure of this knob is, but when I asked the clerk, he told me that it was probably this.




It seems to be a rotary encoder.
(It seems this is also the electric knob of the electric guitar)

Touching it, certainly it will rotate slightly resisting like an audio volume knob.
I will search for the knob to be attached to this protrusion at once, but the ready-made product is still lame.
(I have to make my own too...)

I have not thought about how to attach this knob to the aluminum frame and open and close it with what kind of mechanism, but when designing with visual priority, it cannot think of anything else.
In the meantime, it is sufficient to just use a rotary type opening and closing mechanism.
Immediately, I purchased several rotary encoders.

Well, the things you have to think about knobs at this point are as follows.

① How do I make subtle resistance when turned?
This sense of resistance is important, I think that "a feeling of turning and locking" is born.
(If I just attaching a bearing to the protrusion, it just turns around without any resistance)

② Find a factory that will make the actual lock knob.

③  How do I make a mechanism to open and close bags using this knob?

As ③ seems to take time to consider, I will postpone it.






First of all, in order to check the image with the knob actually attached, I decided to make a real mock of paper based on the illustrations I wrote.
Materials are procured at Tokyu Hands, manufactured in about 4 hours.


It is this kind of thing as a real image of the aluminum frame.
Let's be better than the illustration.

Now,
① Regarding verification of resistance feeling when the knob rotates, this is simple.

There is no choice but to break it in two.
So fix the rotary encoder to the clamp (vise) and cut it vertically with a sander.
I forgot to take pictures, but what I found it to two in half.
There was nothing, there was almost no gap between the base and the shaft, only grease (sticky descent oil) was painted there (laugh) Yes Yes. .

② Look for a factory that will cut the lock knob.
When searching with "Volume knob cutting" on Google, I got a few hits.

Among them, I took an appointment to ”Hata precision industry” that is producing high quality knobs on the product introduction page for HP and visited in a few days.

The president and craftsman of the company are very friendly and young.
(... It is different from Ota Ward ..)
I showed the knob that the factory is producing on the spot.


It's so beautiful! It is all one word.

It is exactly the volume knob of high-end audio as seen in the showroom of Akihabara.
I have arrived lately(lol)

      Me
"I'd like to make a prototype, but I do not have a CAD drawing."

      Hata
" I will write this drawing so I will do it, please specify only the size."

WooooooW!

Look!

      Me
"Well, I’d like to ask, I'd like to make this bag frame out of aluminum scraps, but I do not have this drawing, don’t you know who will write the drawing?"


      Hata
" Well, this is pretty complex shape and it is made up of many R (curves), which is a simple form as a bag, but I think the drawing is quite difficult."


      Me
 "Wow.... (It is not a critical hit, it is a bitter blow again...)

    Hata
'' (While looking at the mock I brought for a while)
・・・ This, perhaps it could be made into a drawing by three dimensional measurement. "
Three-dimensional measurement! What?
Three-dimensional measurement (also called reverse) is like something like scanning in 360 degrees and making it into a drawing in cases like "In reality there is no drawing".
Just like orienteering, I get the following hints from where I go (lol)
I'd like to thank the president immediately, I left the factory and spread the PC at the nearby family restaurant.
"3D measurement Tokyo" return!
Hit!
It is also within 30 minutes from my company.
I called on the spot immediately and took the appointment three days later.
Will it become a way to create CAD drawings!?


※ You can check the bag which is actually finished from here.

www.blau.tokyo

Continue to create the world's most beautiful bag ③

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Creating world's most beautiful bag. Episode 1.  To small factory in Ota Ward