WEBVTT

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>> This is a short
tutorial on lab 4B.

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And like lab 4A wherein 
the overall dimensions

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of the drawing are given.

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Here's it's not.

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Although we know
the depth of three,

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the overall width is not known.

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Okay? We know this length is
1.375 and this length is 2.25;

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however, this is not
directly below that.

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Okay? So the overall
dimension is not known.

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Instead we're going to
use the fact that --

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we're going to start
with the front view

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and use the given heights
.563, .983, .5, and .375,

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which is .875 minus .5 --

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in order to create
the front view first.

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So starting with an imperial
drawing, I have created layers

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that are needed, hidden
objects and center lines

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with appropriate line
type and line color.

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Okay? We're going to start
by making sure that we are

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in the construction layer.

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Then we're going to
draw construction lines,

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start with one that's
horizontal at zero, zero.

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Okay? And then I'm
going to offset

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that using the given
vertical distances.

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Offset the .563 is the
first distance,

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offset this line
to a side above it.

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And then repeat the
offset offset command,

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this time distance of .938.

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Offset this line on this side.

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And then offset --
next one is .5.

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This line on that side.

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And finally, .375, which is .875
minus .5, my height.

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Then the next thing we're going

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to do is draw another
construction line,

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this time vertical at, say,

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some arbitrary position
somewhere here.

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So this would be the starting
point of our front view.

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And then I'm going to look
back at the figure again

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and look at the width, okay?

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This base at the bottom is
of width point -- 2.25 --

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and this point, this corner
here is at an angle 30 degrees

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at a distance of .938 and a
distance of, width of 1.375.

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So I'm going to offset by 2.25
this first vertical construction

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line to the right.

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And then I'm going to draw a ray

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from this point here; a ray is a
construction line just goes

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in one direction.

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And then at an angle relative
polar coordinates I assume

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a distance of one
and an angle of 150.

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That's equivalent to 30
degrees in this second quadrant.

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Then I'm going to start
creating some object lines

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in my front view.

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Okay? Starting with
the line command.

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This base here, and then
this 30 degree line.

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Okay. And then I'm going to
look at the document again.

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So the 30 degree line
needs to intersect

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at a distance of [inaudible].

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And then I'm going to do
this 1.375 to the right

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and also 1.375 to the
right and it's .313.

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So I'm going to offset by
1.375 this very first vertical

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construction line
on the right side.

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Then I'm going to make sure I go
back to the construction line.

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I'm going to draw
construction --

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vertical construction
line passing through this point.

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Then I'm going to make a copy of
this to the right 1.375, okay?

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As you can see, the right side

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of that inclined
part is not directly

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above the left corner
of the bottom part.

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So I created a vertical
construction line passing

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through that point that is not
directly above the platform.

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Then I'm going to offset that
with a distance .313

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for that inverted L front view.

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And then, again, start
creating object lines

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for the inverted L distances.

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So that's my inverted L. So that
pretty much completes the front

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view, except I know
that I'm going to have

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to show some hidden lines for
the circular holes.

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Now, for the right side view,
I see that overall depth

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of three and this construction
line at a distance of 1.125.

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So I'm going to create
an offset.

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I'm going to make the
distance between the front view

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and the right side
view equal to two.

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So offset to the right.

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That's an arbitrary spacing
between the two views.

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And then I'm going to offset by
three the overall width of --

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overall depth of the drawing
for the right side view three.

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And then I'm going to offset

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by 1.125 these two construction
lines, this one here

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to the right and this
one here to the left.

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Okay? And then looking
back at the drawing again

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for that inverted L
this is depth 2.25

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and the overall depth is three.

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Three minus 2.25 is .75.

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So it will be .75
divided by 2.375

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from the left and right sides.

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So .375 from this
line to this line.

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And this one to this
will give the depth

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of the inverted L part, the
upper part of the drawing.

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So I'm ready to start
creating object lines

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for the bottom part here.

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That's three units deep.

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And then I'm going to do the
connecting inclined part

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here, and then the
inverted L. So I'm going

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to see the right side of
that as solid rectangle.

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And then that lower
part will be hidden.

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I'm going to create that
hidden line now for that L part

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so I don't forget later on.

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It's going to be hidden
because we're viewing the object

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from the right side.

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So this pretty much completes
now most of the right side view,

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except for the holes and
center lines later on.

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I'm going to go create my miter
line from the intersection

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of these two construction lines.

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That's my starting point.

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And then I'll be at polar
coordinates one and angle 45.

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That will define my miter line.

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Let's scroll it down
so you can see the extent

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of the drawing.

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So that 45 degree miter
line I'm going to use

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to start locating
details in the top view.

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I'm going to copy any
horizontal construction lines

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from its current location into
each of these intersections

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with the miter line in order
to define the depth locations

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as seen by the top view.

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So the top view and the right
side view are sharing the same

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depth dimensions.

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Going to go to object
lines again

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and start creating the top view.

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I'll start with a platform,
the bottom platform that goes

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from here to here to here.

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Okay? The depth is
three and 2.25 is the --

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then I'm going to
create the L part,

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inverted L. So it goes
from this to this.

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Okay? That's how I
see from the top.

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And then I don't see the
skinny rectangular part

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of the L over here.

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Okay? Then the incline
part connecting the part

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and the top parts, starting
from here, draw a line from here

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to here and then
from here to here.

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That tells me that a portion of
the bottom part will be hidden.

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So I'm going to trim these
other edges, press enter,

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and then click on
this to trim away

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that bottom part that's hidden.

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And I should probably replace
that part of the hidden line.

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So going to the hidden
line type layer.

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That's the hidden line,
among other hidden lines

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in this drawing.
I am going back to object lines.

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I forgot this goes inside

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of that incline plane
seen from the top.

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And then I'm going
to do a fillet.

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As you notice from the drawing,

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all the fillets.
There's a note saying that all the radius

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of R, type R is .25.

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So I'm going to use fillet
radius of .25. Fillet

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that corner -- fillet
that corner also.

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I'll fillet this one.

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Come on, okay.

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And finally, fillet
this corner.

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We're pretty much done.

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The only thing's missing are
the two holes in the top views,

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which will be shown as
hidden lines in the right

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and front view, and also
some hidden lines in the top,

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as well as the center line.