3D Printing - Push Up Bar Add-on!

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3D Printing - table foot replacement

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3D Printer - Verify Accuracy of Printer

Ever wondered how accurate your 3D Printer will create your model?

I wanted to cap the ends of an open tube in my bathroom, so i took the chance to find out!

Printer Model: Buccaneer by Pirate3D

Material: PLA

CAD Software: Solidworks

Also on instructables: http://www.instructables.com/id/3D-Printer-Verifying-Accuracy-of-Print/

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3D Printing - experiment with angled structures

Using the Buccaneer Pirate3D printer and printing at 340 microns on masking tape, it was found that print quality is of acceptable condition until 35 degrees. At 25 degrees, each new layer of PLA is laid too far out into empty air, resulting in a drooping effect.

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3D Printing - shelf extension

Existing setup is first modelled in Solidworks and the necessary parts for the extension are then added on by creating the additional 3D models. In this way, everything is easily visualized and created to scale, no need to keep checking up on the measurements. The size of the two support pieces are bigger than the area of the print bed, therefore it is broken down and printed in two parts, to be joined by super glue. See the video for the entire process of creation, from 3D modelling to printing.

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3D Printing - PLA Sticking Issues Resolved! (Buccaneer Pirate 3D)

I have finally received my Buccaneer Pirate 3D printer and just started playing around with it. Got off a shaky start of broken filaments and poor adhesion of the layers, but all is resolved through the easy to understand re-calibration instructions and various youtube videos from the homepage.

One other problem remains though, and that is the difficulty of removing the final product from the print bed! Sounds like a good problem to have as it usually means the model came out well, but after a few times of brute-force prying the printed model and scraping the remaining debris off the sticky print bed, it is soon apparent that this is not the way to go for long as the adhesive print bed is taking too much damage.

Surfed around the net a bit, realised that for PLA filaments, two cheap solutions exists, and this instructable is to share with you the stuffs i learnt and discovered along the way and also the experience of using the two methods:

1) Using glue stick

2) Using blue painter's tape

For detailed step-by-step process, please click below instructable link:

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Quadruped - Solidworks 3D Model + Matlab kinematics test #1


**work in progress** 

 **programming and fabrication to be done**

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Arduino/MATLAB - Interfacing with ADXL330 Accelerometer

Seeeduino MEGA 2560 with ADXL330  
http://playground.arduino.cc/Main/ADXL330 https://www.sparkfun.com/datasheets/Components/ADXL330_0.pdf

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DIY Electronic "Glow Stick" LED for Night Fishing!

Materials Required: 1) 3V button cell and battery holder
2) 1x micro switch
3) small piece of prototyping board
4) 1x LED
5) 1K resistor

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Arduino / MATLAB - 4DOF with force sensing

Setup can be made to automatically sweep in X and Y direction or controlled manually using the GUI.

Last link is fitted with a force sensing resistor to detect obstacles. It is always perpendicular to the datum plane. On contact with obstacle (my hand in the video), it changes direction in the Z axis. The location of the obstacle is recorded and shown on the MATLAB GUI.

Resources: Seeeduino Mega1280, MATLAB, x4 Hitec servomotors and 1 force sensing resistor.

Prototype Setup


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Arduino / MATLAB - Servo Calibration

Interface between MATLAB and Arduino microcontroller to calibrate servo.
The Seeeduino Mega 1280 is used in this case.

Servo does not center accurately and extends beyond 180 degrees.
Identify error margin and apply correction in MATLAB

Resources used:

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Final Year Thesis - CFD and Prototype

Attachable walking skid to a propeller representation body.
Hydrodynamic characteristics of design justified with Solidworks Flow Simulation.
Prototype simulation carried out in Matlab.
Open source microcontroller used to interface with Matlab for prototype control.
Servos are off the shelve hobby servos modified to be waterproof (total 22 servos).

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Arduino Servo Pan/Tilt - dual mode control with joystick

1x Arduino Duemilanovue
2x 3.7V Lithium polymer batteries in parallel
2x HiTEC HS-485 servos
1x Playstation 2 style analog joystick
1x yellow LED

Setup overview:

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DIY Pegboard with Acrylic Cover

Step 1: Find a sturdy piece of material (eg. plywood, styrofoam, etc.)

Step 2: Drill evenly spaced holes

Step 3: Create the pegs from wires as shown

Step 4: Tape the end of the peg to the back of the board to secure it

Step 5:Add panels of acrylic sheet by using brackets and hinges

Step 6: Put in the tools 


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Arduino Robot - Quadruped - body kinematics tests

This is a quadruped robot in prototyping using seeeduino mega, 12 HXT900 hobby micro servos, 3.7V lipo battery. Materials used are all plywood secured with small bolts and nuts. Programmed with Processing and Arduino IDE.

The first clip shows the horizontal movement of the body and the corresponding reaction angles of the legs.

The second clip includes both the horizontal and vertical movement of the body and the corresponding reaction angles of the legs.

3.7V lipo battery is used to power the servos and the seeeduino mega runs off the power from USB.

Will be working on the walking gait soon.. when i have time..

Visit http://retardokiddo.blogspot.com/ for more projects and future updates!

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Arduino / Processing ADXL330 accelerometer

Visit http://arduinotutorials.blogspot.com/ for more arduino and processing tutorials.
Also available on http://www.instructables.com/id/Arduino-Processing-ADXL330-accelerometer/

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MATLAB/Simulink - Simple Pendulum

Pendulum's equation of motion done in Simulink using ode45 solver. Calculated angle and corresponding x and y coordinates of the pendulum mass are exported to MATLAB workspace and plotted accordingly with timer object. Video shown is accelerated version of 40seconds duration.

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Modified Mint Box Torch

Take out parts of a faulty torch light and give it a second life in a mint box!

Recovered a torch with leaking batteries. Metal contacts of torch is badly rusted and the battery holder is slightly corroded. Too lazy to clean away interior of torch body too.

Get an empty mint box and get to work. Most mint boxes are made of soft and thin metal, so no drilling is needed. Just get a nail and punch a hole. To enlarge the hole (for the switch), simple use a nose plier and bore through it.

Wiring is extremely simple. From positive of battery (9v to fit nicely into my chosen box) to one connection of switch, then from the other connection of switch to the LEDs and lastly back to the negative end of the battery! Only trick here is to figure out how to connect to the PCB of the LEDs. This you will have to do some exploring on your own. TIP>> use aligator clips hooked up to a battery and start poking away at the PCB until you the light!

For more projects, please visit : http://retardokiddo.blogspot.com/

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DIY Cactus Display Tank!

Subject: DIY Cactus Display Tank
1)Fish Tank Stand
2)2X 36W PL lights + eBallast
3)6X clear acrylic sheets(2mm thick, 18X12 inch)
4)8X L-brackets
5)large shiny sheet metal
6)4X hinges

The fish tank stand is laid on its side instead of upright. Reason being the supporting area is more and to reduce the height of the display so that it is only at slightly higher than waist level. I covered up the sides of the stand with black plastic cardboard, with the front two panels hinged to act as a cupboard.

The acrylic sheets are held together by the L-brackets with hotglue. A better method would be to drill holes and use transparent acrylic bolts, but it is too troublesome and costly for me =P.

The lighting fixtures are actually old aquarium light housings, but with the common 15W flourescent tube is switched out. I used a 36w daylight PL tube for each of the lights, arranged transverly across the top of the tank as shown. I find that this arrangment lights up a bigger area, and no additional supporting is needed to fix as compared to placing the lights along the length of the display tank. PL lights require specific ballast to light up, so make sure the correct type is bought and wired up correctly!

***TIP: Use vinegar and newspaper to wipe the acrylic sheets without leaving trail of stains!

Also available with annotated pictures here: http://www.instructables.com/id/DIY-Cactus-Display-Tank/

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