Monday, December 31, 2007, 9:56 PM
simple machines
now i am going to talk about simple machines.....there are....1.lever
2.inclined plane
3.screw
4.wheel and axle
5.wedge
6.pulley
Lets tak about it one by one:
1.lever
Lever s anything that help to move objects especially heavy one.
There are three classes of levers representing variations in the location of the fulcrum and the input and output forces.
First-class levers
Examples:
Seesaw (also known as a teeter-totter)
Crowbar
Pliers (double lever)
Scissors (double lever)
Examples:
Seesaw (also known as a teeter-totter)
Crowbar
Pliers (double lever)
Scissors (double lever)
Second-class levers
Examples:
Wheelbarrow
Nutcracker (double lever)
The handle of a pair of nail clippers
Third-class levers
Examples:
Human arm
Tongs (double lever) (where hinged at one end, the style with a central pivot is first-class)
Catapult
2.inclined plane
An Inclined plane or a ramp is one of the basic machines. It reduces the force necessary to move a load a certain distanc'e up by providing a path for the load to move at a low angle to the ground. This lessens the needed force but increases the distance involved, so that the amount of work stays the same.
3.screw
A screw is a specialized application of the wedge or inclined plane. It contains a wedge, wound around an interior cylinder or shaft, that either fits into a corresponding plane in a nut, or forms a corresponding plane in the wood or metal as it is inserted.
4.wheel and axle
The wheel and axle consists of a handwheel (a disc or lever arm with a handle) which turns an axle around which a chord is wound.
Examples of wheel and axles are:
Bicycles, Ferris wheels, gears, wrenches, door-knobs and steering wheels.
5.wedge
A wedge is a simple machine used to separate two objects, or portions of objects, through the application of force. A wedge is made up of two inclined planes. These planes meet and form a sharp edge. This edge can split things apart. Wedges are used as either separating or holding devices.
6.pulley
This simple machine is made up of a wheel and a rope. The rope fits on the groove of the wheel. One part of the rope is attached to the load. When you pull on one side of the pulley, the wheel turns and the load will move. Pulleys let you move loads up, down, or sideways. Pulleys are good for moving objects to hard to reach places. It also makes the work of moving heavy loads a lot easier.
This simple machine is made up of a wheel and a rope. The rope fits on the groove of the wheel. One part of the rope is attached to the load. When you pull on one side of the pulley, the wheel turns and the load will move. Pulleys let you move loads up, down, or sideways. Pulleys are good for moving objects to hard to reach places. It also makes the work of moving heavy loads a lot easier.
Examples of where pulleys can be used:
Flag Poles
Clothes Lines
Sailboat
Blinds
Crane
9:23 PM
conversion
i have change my blogskin and i am here to post again....ps so long never post liao...but now i m going!hehe...today i am going to talk about conversion... And..a good news...i have finish my dt journal!!!yahoo!!and 2moro is going to start school and i can start my mechanical toy...yeah...!!!Cam and follower
A cam and follower system is system/mechanism that uses a cam and follower to create a specific motion. The cam is in most cases merely a flat piece of metal that has had an unusual shape or profile machined onto it. This cam is attached to a shaft which enable it to be turned by applying a turning action to the shaft. As the cam rotates it is the profile or shape of the cam that causes the follower to move in a particular way. The movement of the follower is then transmitted to another mechanism or another part of the mechanism. Here are the example:
A cam and follower system is system/mechanism that uses a cam and follower to create a specific motion. The cam is in most cases merely a flat piece of metal that has had an unusual shape or profile machined onto it. This cam is attached to a shaft which enable it to be turned by applying a turning action to the shaft. As the cam rotates it is the profile or shape of the cam that causes the follower to move in a particular way. The movement of the follower is then transmitted to another mechanism or another part of the mechanism. Here are the example:
Crank and slider
As the crank (yellow) turns the pushrod and slider is moved up and down, the end point tracing out a curved, but not necessarily circular motion.
Bevel Gears
Bevel gears can be used to change the direction of drive in a gear system by 90 degrees. A good example is seen as the main mechanism for a hand drill. As the handle of the drill is turned in a vertical direction, the bevel gears change the rotation of the chuck to a horizontal rotation.
Examples:
Rack and pinion
Here are the examples:
Friday, December 28, 2007, 11:19 PM
This is the example of the cam toy...see how it moves and my dt project will use the similar machine to make ba...you can open up and c the picture more clearly and the turning effect:)Below is a mechanical toy based on a CAM mechanism. As the handle on the eccentric cam is turned the top part of the egg shell lifts to reveal a face. The basic construction of the toy is also shown below. The ‘flat’ follower moves upwards and downwards as the cam rotates. Although the design is simple it must be made accurately or the mechanism will stick.
A ‘drop cam’ has been used on the toy below. The movement is different compared to the smooth motion of the eccentric cam. As the cam rotates the top half of the shell lifts at a relatively constant speed and then drops down suddenly.
The ‘pear shaped’ cam also has a different motion. The pear shaped cam lifts up the top part of the shell quite quickly and then it drops down just as quickly. However, for half a revolution the shell does not move at all.
Tuesday, December 18, 2007, 6:59 PM
PS i change my blogskin again...coz i thin the last time one hor the words like quite small leh...like cnt c like that...so i decided to change....hahas but this onel ike also veri small also...hahas...but this one quite nice...heheThursday, December 13, 2007, 10:33 PM
the songs
ya..maybe i need to tell your the reasons why i choose this song..first love...if your listen carefully..the song does not have any body singing.. it is onli the song...and the song is quite special..it is not juz the music...and i thin that the song can help us to relax and enjoy what i have post...aiya...your go and listen then can liao lor...so easy rite...aiyo..sae so much for what...go and listen...ok?so..hope that your will like this song... 10:24 PM
more pic!
hehe...i am again too upload pics....enjoy lar..
this pic is soo special...can your see those words?
um..design of the roof?!
make of boxes...isn it?
why the face like that?like quite scary leh...
Um..is this..seashells?!but it doesnt look like leh..
oh...this looks look like staircase...but it seems doesnt look like too leh...
can your see the words..design? 1:25 AM
hehee..i m here again to upload more pic that is quite special...some pic i still can't figure out what is talking about..enjoy...
i am not sure what is it writing but it is also..a design!hehe
so which chair you wan? i love this picture the most because the chairs is very bright in colour...i really love it...hahas...
um..is too..i dun noe what is talking about...but is quite nice lar...
i think this picture is talking about transport...buses,taxi,aroplanes...
Designs!
ya...design is...anything that is special....am i right?
wow...i think design is also anything that we don know what is it talking about!
this..looks like a catus...but a old one ..hehe
this..is ..special!heheThursday, December 6, 2007, 11:15 PM
MOre pics..
A wooden mechanical toy...i think my dt product would be similar to this...
Another examples...
Wow!thats so special!make of cloth?!
Made of plastic..a plastic mechanical toy
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YO, I am SHUJUAN,currently studying in HYSS, and i am a student designer;D MY big big day is 11 of JULY and i will LOVE you much more if you buy something for me:D I am sec2 this year and i studied in a 'zoo' called 2e5.I loves to make friends and tag
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