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# MECHANISMS. LESSON 2. MOTION TRANSMITION

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he says I'm about to transmit motion to
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so excited hold on to your horses hey
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you know if we were a technology system
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I'd have been the driver and you would
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have been the driven I don't know what
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any of those mean osis nothing to get
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upset about let me explain to you we're
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going to have a look at these five
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different motion transmission system a
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reminder that transmitting motion means
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that the motion is being transferred
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from one part to another without
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modifying the nature of that motion
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in friction gear system you have two
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very important components they're called
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wheels it has at least two or more
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wheels without teeth that roll together
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they work using friction each wheel goes
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in a different direction than the other
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one so one is going clockwise and one is
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going counterclockwise they transmit
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rotational motion between two or more
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nearby parts in a simple gear system you
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also have two or more gears that come in
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contact and mesh together it looks a
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little bit like the friction gear system
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but with one very important difference a
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simple gear system has something called
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teeth now friction gear and simple gear
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systems are called reversible systems
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because if you change the wheel that
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receives the motion the system will
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still work it will just go in the
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opposite direction you're probably
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familiar with simple gear systems even
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from looking inside watches and clocks
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now something I should mention about
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transmission systems is that you get
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speed changes this is one of the things
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that occur if your components the driver
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and driven are different sizes you can
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find the gear ratio by using the formula
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the number of the teeth on the driver
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divided by the number of the teeth on
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the driven you can see how much faster
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or slower the driven one is now there's
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a general rule that the smaller the gear
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the more turns it will make and the
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faster it speed now let's look at pulley
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and belt systems pulley and belt
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literally tells you what the components
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in this system are now these two wheels
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instead of called wheels like they are
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called in friction gear they're called
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pulleys and this system actually does
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have an intermediate this belt connects
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the two components the police must have
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a smooth surface for the belt and not to
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break notice that friction gear and belt
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and pulley are almost the same except
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that in belton polly there is a distance
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between the driver and driven and
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there's the intermediate belt connecting
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them also when the two come
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opponents like the pulleys are far apart
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from one another the police end up
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actually going in the same rotational
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motion so they're either both clockwise
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or counterclockwise chain and sprocket
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is another one of those systems which
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whose name tells you exactly what the
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components are so each one of these
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wheels with teeth is called a sprocket
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and it is connected not by a simple belt
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but by a chain once again don't confuse
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belt and pulley and chain and sprocket
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belton pull er you know smooth Brown the
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please and around the belt but chain and
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sprocket you're dealing with chains and
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teeth it is anything but smooth last but
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not least we have the worm and worm gear
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system in a warm and warm gear system
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you do not have an intermediate both
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years touch each other you have a worm
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which is the whole rod call otherwise
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known as the shaft and you have a worm
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gear which is this more circular thing
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with teeth the teeth of each component
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need to slide into each other so in
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gears with teeth and systems that have
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teeth it is very important that the
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teeth are spaced out evenly among each
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other it needs to be consistent or the
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system will not work I hope you learned
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a great deal about motion transmission
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systems today if you look around you'll
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find them all around you I'm only three
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so I'm not trying to understand
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everything but I understand driver and
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driven can you be my driver again

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