WEBVTT

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>> This is a tutorial for
lab 4, the AutoCAD part,

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this is the figure that we're
going to create view for.

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Orthographic top, front
and right side views starting

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with an imperial
drawing, units and inches.

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We start by creating layers.

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Layers is a way of separating
different types of lines

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into different parts
of the drawings.

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So first one is the
construction layer.

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We're going to keep
the color white

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and line type of continuous.

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Then we're going to create
it as a second layer,

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another layer called object
lines where we're going

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to put visual lines in
our graphic drawings.

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I am going to change the
color to blue for this

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and keep continuous as the linetype.

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And then let's close the
layer property manager.

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Let's look at the settings
for object snaps [phonetic]

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with what we need seems
to be there, that's okay.

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Then what we do next
is we change our layer

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to the construction layer.

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We're going to create
our construction line

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and the construction layer.

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So the current layer
is construction,

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all of the entities we're going
to create will be in this layer.

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So we create construction line.

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First a horizontal
construction line passing

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through the origin, comma, zero.

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And then we're going to create
another construction line,

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draw construction line.

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This time vertical,
V for vertical.

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Press enter and then also
passing through zero,

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comma, zero at the origin.

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Let's scan a little bit to
see to see where the two lines

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that we have created are so far.

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They're both back
into the origin,

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one's horizontal,
one's vertical.

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We're going to create
more construction lines

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by simply offsetting, okay,

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working on the horizontal
construction line,

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2.7 is for the front view.

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And then offset again, 1.5.

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And looking at the handout,

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that's the top view we're
starting to create now.

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And then, finally, 3.5.

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Okay, offset this
construction layer on this side,

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construction line on this side.

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Now we're going to work

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on offsetting vertical
construction lines.

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So 4.5 for this one at the
origin copied on this side.

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Repeat, offset again.

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This time with a
distance of 1.5.

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This front view to the
beginning of the right view.

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Then, finally, another
3.5, okay, to the right.

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Okay, so those construction
lines will serve as the location

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of top, front, and
right side views.

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So next thing we're going
to change our current layer,

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set the current layer to object.

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We're going to create
object lines now.

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On the handout, we're going

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to create first the
rectangle on the top view.

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[ Background Sounds ]

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And then we're going
to then create L shape

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in the front view.

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Oops, I'm missing
some distances,

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but let me do just a
left and the bottom part

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of the L. Then I'm going
to create rectangle

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for the right side view.

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I'm relying on intersections
and perpendicular because of all

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of those object snaps aren't on.

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Now click to create the
letter L in the front view.

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Then offset the bottom
construction line by .75,

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I'm looking at the
original figure.

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It's the L is .755.

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And then offset the vertical
construction line on the left

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by one because the distance
of the vertical side

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of the L is one according
to the drawing.

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Then I'm ready to create
and assume the object line,

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so I continue making the
missing parts of my L. Oops,

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I forgot the top
short line there

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for the line, so let's do that.

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I think I have pretty
much the figure that's

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on the handout, okay.

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Okay. Now continuing on, I'm
going to, this is the step 17,

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using Otrack in order
to construct that line.

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Otrack's on, so.

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I didn't click on the
front view, actually,

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use the front view guide for
the location of that line.

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Now focusing on the top
view, I'm going to turn

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on my construction
layer again in order

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to help me construct
the details.

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Offsetting, okay, the missing
construction lines, 1.25.

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This bottom one there
and this top one

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over here lets me set a
horizontal construction lines.

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I'm going to create another
construction vertical line,

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construction line.

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That's the 1.5.

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Oh, and I'm missing
another couple

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of horizontal construction
lines that are .6

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from the edges of the top view.

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So .6 from here to here
and also the bottom one,

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.6 from here to here.

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Now I'm going to start creating
some of the lines, the midline,

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the outline of my top view.

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So that's one and
one on the bottom.

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Okay. And then sequence
of short.

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Okay, to locate the circle,
I'm going to create temporarily

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that vertical line there.

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I'm going to use the center
midpoint of that vertical line

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to find the center location
of the circle of radius .5.

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And that circle should be
tangent do the construction

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lines in exchange for the okay.

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I'm going to do the
missing horizontal line here

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to the quadrant.

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Quadrant is the highest, lowest,
or left-most point.

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Here's another one from this
quadrant to this and to section.

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Oh, what else are we missing?

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Okay, this short
horizontal line's here,

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another one over here,
another one over here.

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And here. Okay, let's
see how it looks

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by turning off our
construction layer.

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Let's clean it up a little bit
and see what we need to trim.

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So using this?

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Trim.

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[ Background Sounds ]

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using this line

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This line.

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This one and this one as
cutting edges or boundaries.

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And trim away this
line, this line,

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this line in the middle here.

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This one, oops, I missed it.

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Let's go back.

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Trim and then I think that's it

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for the trimming,
finish the trimming.

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Let's just erase this temporary line.

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There's many ways of doing this.

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It looks correct now
based on the drawing.

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Now let's continue on by turning

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on back our construction
layer on again.

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And I'm going to create
the miter line, okay.

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But the miter line
is to be created

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in the construction layer, so I
change my layer to construction.

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Here's my command for a 45-degree 
line that allows us

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to transfer distance
of between the top view

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and the right-side view.

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Then I'm going to copy this
vertical construction line

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to relative to the
base point into all

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of these intersections
with the miter line.

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So we have depth
locations from the top view,

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and I'm transferring these
locations into the right side

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by using the miter line.

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Okay. And then I also.

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Oh, yeah, I'm missing the
height dimension for the front

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in the right-side view, 1.7.

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Okay, now I am about ready to

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go back to object line again and
start completing both the front

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in here is missing
that line, the distance

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of 1.7 from the bottom.

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Okay, and this one here
is the front view also.

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And then on the right-side view,
he can start creating this line,

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this horizontal line
that goes all the way

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from the front to the back.

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Then this diagonal
line or midline here.

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Another

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[ Background Sounds ]

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set of line here

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Another here.

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Okay. And then vertical
lines here

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on the right side here
as well.

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[ Silence ]

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Let's see how it looks

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by turning off our
construction layer.

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Let's clean it up by trimming.

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Okay this, this,
this, and this line.

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Cutting edges.

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Press enter and then
click on the parts

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that you want to trim away.

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So it's looking nice.

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I am now dismissing
the tiny, little circle

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in the right-side view.

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I'm going to turn on my
construction layer again

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to help me find a
location of that.

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I'm going to offset because
I know that the center

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of that little circle is at
the distance 1.6 from the top,

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so I offset that top
construction line.

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And then I'm also going to
locate the center of that,

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the depth of the center of that

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by copying this construction
line

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into the midpoint
of my miter line.

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Because I know that the
center of that is right in the middle.

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Now create a circle
with this as the center

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and the section will have
the construction line.

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It really is .25 because the
diameter has given us .5.

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That locates my circle
in the right-side view,

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and that looks fine right now.

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I think I'm done with
all the object lines.

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I'm just now missing
the hidden lines.

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And so I go to the
layer property manager

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and create a new layer
called hidden lines.

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Going to select a different
color for that, say green.

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And then, of course, the line
type should be it's not there,

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so I load.

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Hidden lines not
currently loaded.

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So load, look for hidden, and
then press okay, and make sure

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that you select that as the
line type for hidden layer.

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And then another layer
called center lines.

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That needs a different
color, say red, okay.

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And then I need to
change the line type also.

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It should be center line
type, but it's not there,

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so I click on load again and
look for center line center,

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okay and don't forget
to select center

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as the line type
for center line.

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I think that completes
my two new layers.

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I will close the layer
properties manager,

00:14:28.296 --> 00:14:30.196 A:middle
and then I'll go
to hidden lines.

00:14:31.686 --> 00:14:33.636 A:middle
So where should the
hidden lines go?

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So the holes are usually are the
sources of the hidden lines.

00:14:38.196 --> 00:14:40.326 A:middle
So I turn on my construction
layer again

00:14:40.366 --> 00:14:43.326 A:middle
to see the location
of my hidden lines.

00:14:44.046 --> 00:14:47.726 A:middle
So I know that the
little circle will.

00:14:49.536 --> 00:14:52.166 A:middle
Create hidden lines.

00:14:52.166 --> 00:14:59.916 A:middle
So I try to find the location of
the corner, the top-most point

00:14:59.916 --> 00:15:04.276 A:middle
of the cylindrical hole and the
bottom of the other quadrant,

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so I created those two
horizontal construction lines.

00:15:08.936 --> 00:15:12.766 A:middle
I also need to find a
location relative to the top,

00:15:12.966 --> 00:15:16.966 A:middle
so I copy a vertical
construction line

00:15:16.966 --> 00:15:17.446 A:middle
here using this as the reference.

00:15:17.766 --> 00:15:23.356 A:middle
I take that to the
right quadrant

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and to the left quadrant, okay.

00:15:29.146 --> 00:15:34.826 A:middle
And also one for the
quadrant of the semi circle

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because it was also
create the hidden line

00:15:37.236 --> 00:15:39.316 A:middle
in the front view.

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Next, I copy another couple of
horizontal construction lines,

00:15:46.846 --> 00:15:53.986 A:middle
okay, using the miter line to
locate the hidden lines coming

00:15:53.986 --> 00:15:56.776 A:middle
from the tiny holes
in the top view.

00:15:57.026 --> 00:15:59.676 A:middle
Going back to hidden lines
because I'm now ready

00:15:59.676 --> 00:16:03.076 A:middle
to create hidden
lines, I will create one

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for the top view here.

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This hidden line here and this
another one here, over here.

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Okay, corresponds
to the location

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of the little hole I see

00:16:19.506 --> 00:16:22.256 A:middle
from the top is actually not
seen that's why it's hidden.

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And this one here
is the hidden line

00:16:24.386 --> 00:16:28.196 A:middle
in the front view
coming from top.

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My circular arc and these two pairs
of hidden lines here correspond

00:16:34.546 --> 00:16:36.396 A:middle
to the same tiny,

00:16:36.396 --> 00:16:38.426 A:middle
little cylindrical hole
that's seen from the front.

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And I think those are
my only hidden lines.

00:16:43.326 --> 00:16:48.496 A:middle
Okay, I think we're
done with hidden lines.

00:16:48.496 --> 00:16:52.186 A:middle
We need to now start
constructing center lines.

00:16:54.076 --> 00:16:58.096 A:middle
So I'm going to go
change my current layer

00:16:58.096 --> 00:17:02.136 A:middle
to center lines, okay.

00:17:03.006 --> 00:17:09.396 A:middle
Center lines will locate the
centers of all arcs and circles.

00:17:09.396 --> 00:17:12.336 A:middle
So I need to find the
location of the center

00:17:13.196 --> 00:17:17.866 A:middle
of the cylindrical
hole in the top.

00:17:18.626 --> 00:17:21.186 A:middle
Okay, that's why I
copied that and put it

00:17:21.186 --> 00:17:22.076 A:middle
on the construction line.

00:17:22.076 --> 00:17:25.006 A:middle
So this is my first center
line in from the top.

00:17:26.076 --> 00:17:28.696 A:middle
Center line for the
middle cylindrical hole.

00:17:28.696 --> 00:17:31.666 A:middle
Take note that in order
for us not to be confused

00:17:31.666 --> 00:17:36.036 A:middle
with an actual object lines and
hidden lines or hidden lines

00:17:36.146 --> 00:17:40.316 A:middle
and center lines, center lines
that go beyond the limits,

00:17:41.546 --> 00:17:44.936 A:middle
slightly beyond the limits
so as not to confuse it.

00:17:45.046 --> 00:17:49.656 A:middle
Okay, the center line for
the circular hole arc.

00:17:50.436 --> 00:17:53.846 A:middle
Again, it goes beyond the
actual location of the arc.

00:17:54.786 --> 00:18:00.066 A:middle
There's another one here
going beyond slightly.

00:18:00.066 --> 00:18:03.236 A:middle
So try not to end in
actual construction lines

00:18:03.236 --> 00:18:06.606 A:middle
or object lines or hidden
lines or you confused.

00:18:06.606 --> 00:18:12.296 A:middle
And then, finally, on the front
view, I have a center line here,

00:18:12.746 --> 00:18:15.526 A:middle
slightly beyond,
slightly beyond, okay.

00:18:16.546 --> 00:18:22.916 A:middle
And then right side two
center line corresponding

00:18:23.016 --> 00:18:30.606 A:middle
to the circular local,
cylindrical hole.

00:18:30.996 --> 00:18:33.336 A:middle
Again, it goes beyond the
boundaries of the cylinder.

00:18:33.946 --> 00:18:35.976 A:middle
And then one going
left to right.

00:18:39.516 --> 00:18:50.546 A:middle
Using tracking, I need to go
slightly beyond.

00:18:51.046 --> 00:18:52.636 A:middle
Those are my hidden.

00:18:52.636 --> 00:18:55.136 A:middle
So one thing you will notice is

00:18:55.136 --> 00:19:00.556 A:middle
that even though the center
line type which is long short,

00:19:00.556 --> 00:19:01.906 A:middle
long short, long short,

00:19:01.906 --> 00:19:05.056 A:middle
sometimes you don't see the
long short, long short pattern.

00:19:05.206 --> 00:19:08.606 A:middle
And the only thing we
see currently is the one

00:19:08.606 --> 00:19:09.086 A:middle
in the front.

00:19:09.086 --> 00:19:12.966 A:middle
So what you can do is
change the line-type scale.

00:19:12.966 --> 00:19:17.256 A:middle
So you select all the
center lines, okay.

00:19:17.256 --> 00:19:21.386 A:middle
And then under properties,
click on the property manager,

00:19:21.556 --> 00:19:27.056 A:middle
go to line-type scale, line-type
scale, and make it smaller.

00:19:27.126 --> 00:19:29.776 A:middle
Let's say, let's try
.3 and see if it works.

00:19:30.576 --> 00:19:32.566 A:middle
Rather than one,
by default it's one.

00:19:33.256 --> 00:19:37.006 A:middle
Then let's see how it looks with
this smaller line-type scale.

00:19:37.216 --> 00:19:40.806 A:middle
Hopefully, you will see
the actual, there we go.

00:19:41.046 --> 00:19:43.666 A:middle
It's long short, long short,
long short, and you can see

00:19:43.706 --> 00:19:45.726 A:middle
that it's center line.