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2. Motor Mechanisms 

1. Characteristic of plastic

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At first, plastic was used for substitute of woods or metal.  You will be surprised that cutting

board and bath tub are made by wood once upon a time.  Bucket and fan are made by metal.

As you know these materials chaning to the plastic, because we are using advantage of

plastic.

As we mentioned the advantage of plastic, it is "light," "strong at water," "doen't rust," "doesn't

pass electricity," "easy to proceed," "possible to be colored and transparent," "doesn't pass

fever," and etc. Of course there are some faults, such as "easy to change a shape than

metal," "easy to break than metal," "easy to get a clack," "weak at  heat," " change a shape

from ultraviolet ray," and etc.  Plastic has some faults, however, its advantage is very

attractive. Recently, by devising plastic material, it is becoming not easy to break, strong at

heat, not easy to change shape, and etc., and active for you.

There are many things which use plastics around us.  Maybe we will have hard time to find

products that are not using plastic. Plastic is such an essential material.  When we explain

the plastic more minute, it is a material that is able to fabricate freely from heating and

pressurization, and it is removed synthesized synthetic rubber, synthetic fiber, synthetic

leather, and called as synthetic resin.  It sounds like difficult, doesn't it?  Let's explain about

plastic that we don't know unexpectedly even plastic is familiar material to us.

Kind of plastics are changed by place to use, how to use, and shape. Plastic can be divided

into two sections.  First one is the plastic that becomes tender by rising temperature

(thermoplastic.) Second is the plastic that becomes tender by rising temperature, but if we

raise the temperature more higher, it becomes hard (thermosetting.) However, this is too big

range to define plastic.  Usually we call plastic as thermoplastic and thermosetting.  Let's

explain some of plastics (we cannot explain everything of plastic, because there are

numerous kinds of plastic.)

・

Plastic bag, Vinyl bag

When you go to shopping at convenience store or mall, you will receive plastic bag or vinyl

bag.  These bags are made by very thin plastic. Usually, we call vinyl bag that is made by

polyethylene chloridized vinyl, and plastic bag that is made by polyethylene.

・

Past 

Light

Easy to change

Color changes

Weak at heat

Strong at water, not to be rusted

not to pass the electricity

Easy to process

・

Present

・

Advantage

・

Fault

Ⅳ. Explanation of plastic

Ⅳ.

Explanation of Plastic

Ⅳ.

Explanation of Plastic

*MR-9003E  3.7.30 1:47 PM  ページ 32

Содержание MR-9003E

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Страница 5: ...t Nut 3pcs Battery contact for PCB 3pcs The side with the slot 4 Assembly of Controller Assembly of Mechanical Parts e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e...

Страница 6: ...e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e...

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Страница 12: ...hole Put in small cut up pieces of rubber bands Ping pong table Install fences around the table Goal Goal Make many other creative and fun games and rules How to operate Forward Left rotation Right ro...

Страница 13: ...printed circuit board through which the electric current can pass When the switch on the controller is pushed the switch contact inside is also pushed in and makes a path for the electricity to run th...

Страница 14: ...I 6K O2 0Y V4 6K O2 0M I4 6K O2 M I4 6K O2 0Y I4 6K O2 0M I4 6K O2 0M I4 6KhO2 0M I4 0M I4 0M O2 6K O2 6K O2 6K O2 6K O2 6K O2 6K W2 6X O K W2 6X W X O K W2 6Xhg W X hf W Xhf W X he W Xhe W X h 7 1 h...

Страница 15: ...ted Mold Explanation of Molding Explanation of Molding The robot has many plastic parts for its body and the controller There are many plastic products around you also When you compare the same plasti...

Страница 16: ...he gate Melted plastic was poured in here Parting line The part where the molds meet Gate Parting line Explanation of Molding Weld line As explained in the previous pages the molds have the shape exac...

Страница 17: ...heating and pressurization and it is removed synthesized synthetic rubber synthetic fiber synthetic leather and called as synthetic resin It sounds like difficult doesn t it Let s explain about plast...

Страница 18: ...them by heat and chemicals These could be other products later Recently package of the products show material of plastic to distinguish each material easily Recently a gift box has a printing of plast...

Страница 19: ...nd vinyl wire might be cut sometimes PCB solves this problem as well You may hard to find the electric machines that is without a circuit board However circuit board has some electricity to avoid elec...

Страница 20: ...er film is that copper made as very flatten and it is the part that let electricity through The board has the copper film only one side is called one sided PCB both side is called double sided PCB bot...

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