WEBVTT

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>> This is the tutorial for
the first part of lab 2.

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We're going to create this
drawing on the left side

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in the actual scale
and units and material.

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But, we're going to
start with imperial.

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OK? And I'm going to turn
on both the grid and snap

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and I will rely on grid and snap

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to easily construct
the geometry shown.

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So I'm going to start with
the first drawing here.

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With a line -- line command.

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And then add to the
horizontal line would be three

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vertical lines.

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And then I'm relying
on the snaps

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to create, easily, the drawings.

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That's the first
drawing, the upper part.

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Then we're going to do the
second drawing using the line

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command again.

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Here's the left side using
the snap and the grid.

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And here's the middle part
using the line command again.

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And then repeat the
line command again.

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OK? That's the second drawing.

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Then you're going to
do the third drawing.

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I'm going to start with
the circle in the middle.

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I'll just indicate
the center here

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and radius equal
to 2 grid units.

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And then the left circle
I'm going to use this

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as the center right here and
then 1 grid unit is the radius.

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Then the right circle
center here

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and 1 grid unit as the radius.

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And then, finally, at the
bottom -- oh, before I do that,

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I need to do the 2 horizontal
lines by using tangent.

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Tangent. Tangent.

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Tangent. Take note I made
sure the setting has tangent

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for object snap.

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And then finally the
bottom line command again.

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And then just complete
the geometry shown

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by indicating a series
of points.

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And that's my left drawing.

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And all I need to do is now
copy this using the lasso.

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OK. Take note that I
missed one of the lines

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so I'll just click on that line,

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to include in my clip
board and then press enter

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and then base point, I just
select the origin and then I put

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that origin for the
second base point somewhere

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on the right side.

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Now I have two copies.

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Finish the copying.

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Now we're going to start
editing the upper part

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by the trim command.

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Select trim and then
boundary edges.

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or cutting edges
will be horizontal.

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And then click on the part
the vertical line you want

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to trim away.

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And then extend boundaries we
extend will be the two vertical

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lines on the left
and on the right.

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Press enter.

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And then lines to extend,
just start clicking

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on the lines you want to extend.

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So this extend night trim
commands work similarly.

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You select the boundaries first
before you select the object you

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want to trim or extend.

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Now for the third
drawing, trim again.

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Trim and my boundary.

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Select the boundary for
the two horizontal lines.

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Press enter.

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And then now select the parts
of the objects you want to trim

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by clicking on the circles.

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And then, another trim.

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This time the boundaries will be
the arcs from the big circles.

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Press enter and then select
the lines you want to trim.

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And then, finally, we
use the mirror command.

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We select -- we can either
do a lasso or a window

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or just simply select
each of the lines.

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And then, after completing the
selection, you press enter.

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And then it wants you to
indicate a line of symmetry.

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So you just do a vertical line
for symmetry and then press no

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because you don't want to
deal with the original.

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And then we're done.