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Modelling materials for mechanism (Explore the working of mechanism by…
Modelling materials for mechanism
Explore the working of mechanism by using materials such as > card, polystyrene sheet, corrugated plastics, plywood, plastic mouldings and construction kits
Card
is good material > for trying out mechanisms > as it is cheap and easy to work with
Can put models together quickly from card templates using drawing pins, paper fasteners or eyelets for pivot points
Use wooden or plastics backing board when trying out card mechanism
Can try make parts from thin polystyrene sheets
Card template
can be hand drawn or designed using a simple computer aided design program
Card wheels
are easily cut using a circle cutter
You can use these with very light structure > such as framework made with thin wooden strips glued to pieces of card
If you need wooden wheels or gear, you can make them with a hole saw
A gear is made from a wooden disc by drilling holes around > outside edge and inserting short pieces of wooden dowel
A jig is needed so that you can easily drill the holes accurately
Another method is > hammer panel pins lightly around the edge of a wooden disc to make the gear teeth
Chassis
If you need a chassis for a mechanism, you may find > corrugated plastics sheets is very useful
It has flutes that are ideal for a shaft, though you may also need small bushes to keep shaft steady
You can attach other components to the shaft such as wheels, gears, pulleys and cams
Plastic mouldings
Many types of cheap plastic mouldings are available for mechanical project work > including wheels, gears, cams and pulleys
Using pre-fabricated components can save valuable time when realising a project
Gear box
By mixing gears of different sizes, a gear box can be made for increasing or decreasing the output speed in a mechanical system
When u make a gear box, you must mark out the gear shaft positions very accurately, so that the gears mesh smoothly