I spent this week thinking more deeply and experimenting on designs for the earphone organiser.
Many designs came to my mind.
1. A design similar to the old manual measuring tape where you have to wind a rotor of sort to wind the tape back to into the spool.
2. Another design is similar to the copper braid container. A copper braid container has a flexible layer of plastic which allows the copper braid to be pulled from the spool with a slight tension, But it is one way. That means  it is not meant to to be wound again(got to check this and make sure). What I am thinking is to make a spool on which the ear phone wire can be manually wound and taken out but a through a silicone opening covering winding slot of the spool. This is self closing and when required the wire can be extracted too.

I choose the winding mechanism similar to measuring tape to begin with. Since I like the idea and it is more mechanical in nature.

I worked a little more on the design I did last week and finally made some cuttings with the laser and made a cardboard working prototype. I was glad it was working as I imagined but it was a tedious to get corrugated carboard to slide over each other.

First protortype



Files are at
https://www.dropbox.com/s/ixmxee9xb1gwgbb/all_f.svg?dl=0

You might have to use either glue gun of quick glue to assemble these. Part 1-5 are assembled in to one part which is the inner container and there are 5 of part 6 which is the sliding door. Right now we just slide the assembled pat1-5 and part 6 into each other. A little bit of dextirity is required here. I thick a little more clearence in the inner dia of part 6 will also do good.
I used glue gun due to non availability of the quick glue and it still worked. The sliding was a bit constricted because of friction of cardboard over cardboard.

To do
3D printed prototype
May be plastic molding and casting, for better sliding performance.
Improve the design to advanced level if possible(includes two different compartment, for wire from ear bud to the junction of the wire and another from the junction to plug)

Update
20/11/15
I finally made a 3d printer protype and it works perfectly.



I split the sliding door into two because I want to get the details of the rails accurately. If I use support structures or try to print is with support structure too It wouldnt come properly.

Files at
https://www.dropbox.com/sh/7v718lwoarm4pmy/AACf-BgCQlmPBZ4A35MIxESka?dl=0

I split the sliding door into two because I want to get the details of the rails accurately. If I use support structures or try to print it without support structure, It wouldn't come properly. Later fevi quick or other such quick glue can be used to attach the two parts. I used the heat gun and few layer of pla from the support structure generate from printing the n1.stl to weld the both together. his doesnt seem to be a good idea the entire part stated warping and partially lost its form. This didn't create much difficulty but the it no more functioned perfectly. It still functioned to acceptable level. If you are trying to weld it with waste PLA then I suggest use of soldering gun and to keep soldering gun at 220 Celsius and try to weld them together.

Assembly
1. Print all the parts.
2. After printing the slide door top and bottom attach their flat side together.
3. Assemble the top and sliding dorr such that the top and the n1 part encase the sliding door. The top part has a grove on which the sliding door mates and the n1 has a ramp on which the ramp feature of the sliding door sits. Assemble them in proper orientation.
4. The top and n1 dont have holes so that screws can be used to assemble them. I used soldering gun again to weld them together when they are in proper orientation. The proper orientation is when the cavity of the top match the cavity on the n1. You can also try to drill holes and attach them.In next version I am going to provide the holes. A little adjustment of height is necessary. I used the support structure PLA in between n1 and top and welded them on to the n1. Later as I said before welded them all together with soldering gun when in proper orientation.

Preparing Laptops and Lab Computers

Since fabacademy philosophy roots in opensourcing it only makes sense that Ubuntu and the free softwares are used. This allows free and ope access to anything and everything that is done in fablab. It allows repetability and a common framework that anyone can work with. One of most important of them is the OS itself which is the linux based UBUNTU system. The next most inportant software is  the fab modules which can control alomst any CNC machine that is present in fablab.

The pain of Ubuntu 

Ubuntu means 

"A quality that included the essential human virtue; compassion and humanity. there is a need for understanding not vengance, ubuntu is not victimization"

Indeed you need to have a all these to go through Ubuntu install and setup.

Creating digital accounts

During fabcademy you will be evaluated through your documentation which explains the world and the remote mentor or Neil what you have done. There will be times when your projects will be recommended by your remote mentor to higher faculty or Neil. They will see your website or the files you created. For these reason you need to learn to effectively express your work in a document. They should be online and freely available to anyone, they are opensource.

Day 4 week 1

Lab maintenance and Material handling

I took charge of Vinyl cutter and Roland Modela

I learned how to better handle the vinyl rolls. The vinyl rolls when kept vertically deform and get damaged at the edge which happens due to it not being able to support its own load properly. The correct way to keep a vinyl material is horizontal and the rolls to be taped at the open edge after use so that they don’t become loose.

The vinyl rolls were kept on the ground earlier.

Vinyl cutting

Used to make sticker and best use is to make PCB that are flexible. Can cut copper, epoxy and vinyl sheets.

Loading the material 

Use this lever to release or secure the vinyl.

Materials should be between the two translucent patches as shown in the picture. These have rough surface in order to grip the papaer better. The wheels should secure the paper when the lever is engaged.

Day 2 w2

Laser in our fablab is a trotec speedy 100 with that we have an atmos exhaust filter from trotec. Here's the laser machine and our super cool prefab guide and fabguru Francisco explaining about the filter system.

Polycarbonate lid and Atmos Exhaust Filter system

Filter parameters

Things to watch out for

Exhaust filter should be on.

Molding Casting and Roland Modela

The basic idea for this session is to create an 3D object through computer and try to make it in machinable wax in such a way that a molding pattern is created directly from it. Roland modela will machine the wax. We will try to replicate this object by creating a silicone mold and later use the silicone mold to cast hard plastic into it.

Day 5

Shopbot

Notes:

Designing for milling

Due to tool radius inner corner of a hole or a pocket cant be sharp. Overmilling is advised in such cases.

Good design guidelines for milling.

http://blog.inventables.com/2014/06/learn-about-milling-inside-corner.html

http://www.efunda.com/processes/machining/mill_design.cfm

Better to use antimony to design material to be milled.

Dia max to be used for milling in shopbot- 6mm

Dia max to be used for milling in roland -3mm.

Week 3 Day 1

This week we move to electronics design and fabrication.

Today we started with electronics production. The goal was to fabricate a pcb from an already existing design. We use roland modela to fabricate the PCB.

Assignment: to fabricate a version of fabISP using Roland modela and fab modules.

Process

We downloaded the the following designs.

Week 3 Day2

Many of the fabacademy cad items are design that have .cad extension. These were designed in kokopelli. .cad file is basically a python script. Today we try to edit and understand how the script ad kokopelli.

Assignment

We add components to a hello.ftdi.44.cad and wires on a board and fabricate it.

Consider the following methods of programing a microcontroller

Arduino ide- most user-friendly, many tools, quick,  easy

C  - intermediate difficult, need to have more hardware knowledge, more efficient in code handling and storing, more freedom to program.

Assembly lowest level of programing, need to have through understanding of the hardware also, more difficult, highly efficient in code handling and occupies least storage, and allows most freedom to program.
Loading
Dynamic Views template. Powered by Blogger.