Wednesday, April 30, 2008

This is my final product
please comment it on my tagboard!
THANKYOU!

This is Kenneth Lo's...

This is Zhi kang de model..

Lynn de model...

Chek Jun's...

~End of Post~
10:56 PM

Friday, March 28, 2008

Have you ever wonder how life is like with a phone looking just like a MP3?

Now, you can!

With one of the lastest sony ericsson phone, W980i is surely your choices!

Keep your W980i closed while listening to music. Walkman® keys are placed on the front, and the color screen provides info about the song you're playing.

Afraid Not Enough Memory For Your Music?
With 8GB internal memory, the W980i stores up to 8000 songs (eAAC+ format). When you want new music, download straight from the Web to your phone.

Music shared
Share your favorite tracks - channel your music through the stereo speakers. Or use the built-in FM transmitter to send the music to other FM receivers.

Want To Know More?

Go To http://www.sonyericsson.com/cws/products/mobilephones/overview/w980i?cc=sg&lc=en

Be Patient, The Phone is Yet To Be OUT!

~End of Post~
11:30 PM

Tuesday, March 4, 2008

•Bees

This model has three bees attached to a platform that rotates freely round a central pole. As the bees are rotated, the platform is forced to rise as the red strings twist and tighten themselves around the pole.

The bees are then released and the weight of the platform then makes the strings unwind, lowering the platform and starting the process all over again.

•Kissing Couple

Two pairs of double cams make the heads of the kissing couple move up and down and turn from side-to-side.

The cams are joined to the main shaft and rotate when the crank is turned. See rotary motion for more information.

~End of Post~
6:24 PM

Technical Vocabulary

Anchor
A rigid point of support.

Anti-clockwise
In the direction opposite to the rotation of the hands of a clock.

Axle
A supporting shaft or rod on which a wheel or a set of wheels revolves.

Chassis
A rectangular frame, usually supported on springs and attached to the axles, that holds the body and motor of an automotive vehicle.

Centrifugal force
The force, equal and opposite to the centripetal force, drawing a rotating body away from the centre of rotation.

Clockwise
In the same direction as the rotating hands of a clock.

Crank
An input device, such as a handle, that when turned makes parts of a machine move or operate.

Diameter
The length of a straight line drawn across a circle passing through it's centre.

Force
Forces are pushes or pulls that make things start or stop moving. Forces can also speed up,
slow down or change the direction of movement.

Friction
The force that stops things from moving freely when they rub against each other.

Fulcrum
The pivot point around which a lever turns.

Input
Energy, work, or power used to drive a machine.

Intermittent
Stopping and starting at intervals.

Lever
A rigid rod pivoted about a fixed axis called a fulcrum.

Linear motion
Movement in a straight line.

Linkage
A series of levers connecting together moving parts of a mechanism.

Motion
Movement: the act or process of changing position or place.

Oscillating motion
Movement backwards and forwards along a circular arc.

Output
The energy, power, or work produced by a system.

Parallel
When two objects or lines are the same distance apart along the whole of their length.

Piston
A solid cylinder or disk that fits snugly into a larger cylinder and which is forced to move under fluid pressure.

Pivot
The central point or short shaft on which something balances or turns.

Platform
A horizontal surface raised above the level of the area next to it.

Reciprocating motion
Movement backwards and forwards in a straight line.

Rotary motion
Movement in a circular path.

Shaft
A rod in a machine to which cams, gears and pulleys are attached.

Stationary
Not moving.

Torque
The turning effect of a force in rotary systems. Measured in Newton Metres (Nm).

Undulate
To move in a wave like motion.

~End of Post~
6:15 PM

Motor Switching Circuit

Many fairground ride models can be controlled by a simple electronic circuit consisting of the following components:
•Motor

•Switch

•Battery and battery holder

•Wires

The animation shows the components without any connecting wires. It is possible to add wires to the circuit by clicking and dragging from one terminal to another.

~End of Post~
6:11 PM

•Pulley Wheels and Pulley Belts:

Force and rotary motion can be transmitted from one shaft to another by using two pulley wheels and a pulley belt.

By altering the size (diameter) of the pulley wheels it is possible to change the speed of rotation of the output shaft.
To achieve a large speed reduction or increase, it is sometimes necessary to combine more than two pulleys in a system. This removes the need to have very big pulleys which can cause problems where space is limited.

Gears!~

•Spur Gears

Spur GearsSpur gears are toothed wheels which mesh together to transmit rotary motion and torque.

When two gears are used it is called a simple gear train. If one of these gears is attached to a motor or a crank then it is called the driver gear. The gear that is turned by the driver gear is called the driven gear.
Gears are used to increase or decrease the speed or power of rotary motion. This is achieved by using gear wheels with different numbers of teeth. To see this happen, alter the number of teeth on the gear wheels in the animation.
In simple gear trains the driver and driven gears rotate in opposite directions.

•Bevel Gears

Bevel gears work in pairs and in a similar fashion to worm and worm wheels, they transmit torque and rotary motion through 90º. The coffee grinder in the photo shows a practical application of bevel gears.

When bevel gears have the same number of teeth on each wheel they are called mitre gears. For every complete turn of the input shaft the output shaft turns once as well. The Chair Ride drive mechanism uses mitre gears.
When gear wheels with different numbers of teeth are used, an increase or decrease in the speed of output shaft rotation will result.
Run the animation with 'show markers' selected and you will see that for every one complete turn of the input shaft the output shaft turns four times.

•Worm and Worm wheel

Like bevel gears a worm and worm wheel transmits torque and rotary motion through 90º. The Speedway ride animation uses a worm and worm wheel to drive the front wheels of the lead car.

Worm and worm wheel gears are used when large speed reductions are required. The worm, which is attached to the spindle of the motor, has one tooth and takes the form of a screw thread. The worm wheel in the photo (above) has 30 teeth. Therefore, the motor spindle has to turn 30 times in order to make the output shaft turn once.

~End of Post~
5:56 PM

Types of motion:

•Linear motion
Linear motion is movement in a straight line. An example of linear motion is the cutting arm of a paper guillotine (below) as it travels from one side of the machine to the other.

•Oscillating motion Oscillating motion is movement backwards and forwards in a circular arc. E.g. playground swings (photo) and clock pendulums.

•Reciprocating motion

Reciprocating motion is a backwards and forwards movement in a straight line. Sewing machine needles work with this type of motion.

•Rotary motion

When something moves in a circle it is called rotary motion.

~End of Post~
5:51 PM