WEBVTT

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>> This is a tutorial
for part A of lab 3.

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This is the geometry
we're going to create.

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We start with a new file that
is in metric then we create,

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start by creating a circle at
the origin, center is zero,

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zero and radius is 20 and then
creating another circle the same

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center of radius 40, and then
finally create another circle

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at 0,75, seventy-five,
also radius 20.

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Let's pan this towards
the center and zoom

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in a little bit using
our scroll in our mouse.

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Then we're going
to create 2 circles

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but this time it's using
tangent tangent radius

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because the circle we're looking
for is tangent to this circle,

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tangent to this larger circle
and then radius of 100.

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Okay, repeat the same
thing, you need to click

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on the approximate location
of the points of tangency

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so circle, tangent,
tangent, radius.

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Okay, and then radius is 100.

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Next thing we're going
to do is we're going

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to start trimming things
that we don't need, okay?

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Using this circle up here,
the small one on top and this

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on the bottom as our
boundaries, press enter.

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Click this part of the 2 big
circles that we want to trim out

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and then we repeat that
trim command again.

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This time our boundaries are
the 2 arcs of radius 100,

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press enter, and click on this
part of the 2 other circles

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that we want to trim away.

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The next thing we're going

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to do is we're going
to create a key way.

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Let's zoom in on the
location of the key way.

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I'm going to first construct
a vertical construction line

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passing through the
center and to make sure

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that it's vertical I'm
going to use the ortho.

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Ortho means you can only
go vertical or horizontal.

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So that line is perfectly
vertical and then I'm going

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to offset that construction
line,

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the length is not
important, 5 units to the left

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and 5 units to the right, okay?

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And then I'm going to create
a line from this intersection

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to this intersection because
that line I can now offset

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at a distance of 5 as well
so that tiny little line,

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select that line
to offset above it,

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that's the upper
part of the key way.

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Now, all we have to do is
clean it up by trimming.

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So let's trim.

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Using this horizontal line
and this horizontal line

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as our cutting edges,
press enter,

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and then trim away the
parts of the vertical lines

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that we don't need
in the picture.

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And then we need
to do another trim,

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this time with the
2 vertical sides

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of the key way as
our cutting edges.

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Press enter in between and then
click on the part of the circle

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that we want to trim away

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and then we just delete
this little line here

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and the construction line,
the vertical construction line

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and there is our key way.

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Next thing we need to do is
to convert this into a block

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by going to insert and
then create block, okay?

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Let's select points to
be included in the block.

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All we're doing is we're trying
to create a single entity

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that combines everything here

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into a single object called
a block and it's asking

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for a name of the block.

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We type cam and then we select
a base point, just say pick point,

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and then we want the
base point of this block

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to be center of the circles, which is also 
the origin, and then we're done.

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All it did, now everything
here is now 1 entity or 1 block

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and it's called a cam.

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Very similar to polyline.

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Next thing we do is to create
a circle above the cam.

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So create, go back home and
create circle, center radius

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and the location of the center
is x equals zero and y is 120

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and it's a radius 25, okay?

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So it should end up tangent
to the R20 below it.

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Then we're going to create
2 other smaller circles

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in the same locations as the
center, one is a radius 12

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and the other one
is a radius 5, okay?

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And then we're going to
create 2 vertical lines

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for the ...
follower up there

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so it's going to
be vertical line.

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To make sure it's vertical
I'm going to click on, on,

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on ortho so it's vertical.

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I'm going to assign a
length of 85 to that.

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The length is arbitrary
so I just type the length.

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And then the next thing I'm
going to do is I'm going

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to offset that and make a
copy of that to the right,

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which is 24 units, a slight
offset on the right side, okay,

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and then I'm going to
connect the top of this too.

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The next thing I'm going to do
is I'm going to create a block

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for the followers,
insert create block,

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name of the block is follower,
and then select the entities.

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It looks like I'm in
the lasso so I'm going

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to lasso everything, that
includes the follower, okay?

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Press enter after I
selected my objects

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and then pick the base point.

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It will be the center of the
circles and then press okay

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and just to verify it is,
indeed, now a single block.

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Okay, next thing we're
going to do is we're going

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to create the 2 rectangles
that are hatched that serve

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as the guide, the guide
for the followers.

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So create a line.

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We're going to make sure
that they are horizontal

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and vertical by doing ortho.

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So I'm going to create a
line of arbitrary length here

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and then I'm going to
create another line vertical

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arbitrarily, let's say
the length is 16 units.

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I'm going to type 16 on here.

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And then for the third closing
site I'm just going to offset

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by 16 because that vertical
line is 16, this upper part here

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on this side here, and then I'm
going to mirror those 3 lines

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to the other side so press enter

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and then my mirror line will
be a vertical line passing

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through the center
of the follower.

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Okay. And then no, I
do not want to erase

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and then I'm going to hatch.

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Okay, it's ANSI13 okay

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so select hatch the areas inside
and then I'm done.