>> This is a short tutorial on lab 4B.
And like lab 4A wherein the overall dimensions
of the drawing are given.
Here's it's not.
Although we know the depth of three,
the overall width is not known.
Okay? We know this length is 1.375 and this length is 2.25;
however, this is not directly below that.
Okay? So the overall dimension is not known.
Instead we're going to use the fact that --
we're going to start with the front view
and use the given heights .563, .983, .5, and .375,
which is .875 minus .5 --
in order to create the front view first.
So starting with an imperial drawing, I have created layers
that are needed, hidden objects and center lines
with appropriate line type and line color.
Okay? We're going to start by making sure that we are
in the construction layer.
Then we're going to draw construction lines,
start with one that's horizontal at zero, zero.
Okay? And then I'm going to offset
that using the given vertical distances.
Offset the .563 is the first distance,
offset this line to a side above it.
And then repeat the offset offset command,
this time distance of .938.
Offset this line on this side.
And then offset -- next one is .5.
This line on that side.
And finally, .375, which is .875 minus .5, my height.
Then the next thing we're going
to do is draw another construction line,
this time vertical at, say,
some arbitrary position somewhere here.
So this would be the starting point of our front view.
And then I'm going to look back at the figure again
and look at the width, okay?
This base at the bottom is of width point -- 2.25 --
and this point, this corner here is at an angle 30 degrees
at a distance of .938 and a distance of, width of 1.375.
So I'm going to offset by 2.25 this first vertical construction
line to the right.
And then I'm going to draw a ray
from this point here; a ray is a construction line just goes
in one direction.
And then at an angle relative polar coordinates I assume
a distance of one and an angle of 150.
That's equivalent to 30 degrees in this second quadrant.
Then I'm going to start creating some object lines
in my front view.
Okay? Starting with the line command.
This base here, and then this 30 degree line.
Okay. And then I'm going to look at the document again.
So the 30 degree line needs to intersect
at a distance of [inaudible].
And then I'm going to do this 1.375 to the right
and also 1.375 to the right and it's .313.
So I'm going to offset by 1.375 this very first vertical
construction line on the right side.
Then I'm going to make sure I go back to the construction line.
I'm going to draw construction --
vertical construction line passing through this point.
Then I'm going to make a copy of this to the right 1.375, okay?
As you can see, the right side
of that inclined part is not directly
above the left corner of the bottom part.
So I created a vertical construction line passing
through that point that is not directly above the platform.
Then I'm going to offset that with a distance .313
for that inverted L front view.
And then, again, start creating object lines
for the inverted L distances.
So that's my inverted L. So that pretty much completes the front
view, except I know that I'm going to have
to show some hidden lines for the circular holes.
Now, for the right side view, I see that overall depth
of three and this construction line at a distance of 1.125.
So I'm going to create an offset.
I'm going to make the distance between the front view
and the right side view equal to two.
So offset to the right.
That's an arbitrary spacing between the two views.
And then I'm going to offset by three the overall width of --
overall depth of the drawing for the right side view three.
And then I'm going to offset
by 1.125 these two construction lines, this one here
to the right and this one here to the left.
Okay? And then looking back at the drawing again
for that inverted L this is depth 2.25
and the overall depth is three.
Three minus 2.25 is .75.
So it will be .75 divided by 2.375
from the left and right sides.
So .375 from this line to this line.
And this one to this will give the depth
of the inverted L part, the upper part of the drawing.
So I'm ready to start creating object lines
for the bottom part here.
That's three units deep.
And then I'm going to do the connecting inclined part
here, and then the inverted L. So I'm going
to see the right side of that as solid rectangle.
And then that lower part will be hidden.
I'm going to create that hidden line now for that L part
so I don't forget later on.
It's going to be hidden because we're viewing the object
from the right side.
So this pretty much completes now most of the right side view,
except for the holes and center lines later on.
I'm going to go create my miter line from the intersection
of these two construction lines.
That's my starting point.
And then I'll be at polar coordinates one and angle 45.
That will define my miter line.
Let's scroll it down so you can see the extent
of the drawing.
So that 45 degree miter line I'm going to use
to start locating details in the top view.
I'm going to copy any horizontal construction lines
from its current location into each of these intersections
with the miter line in order to define the depth locations
as seen by the top view.
So the top view and the right side view are sharing the same
depth dimensions.
Going to go to object lines again
and start creating the top view.
I'll start with a platform, the bottom platform that goes
from here to here to here.
Okay? The depth is three and 2.25 is the --
then I'm going to create the L part,
inverted L. So it goes from this to this.
Okay? That's how I see from the top.
And then I don't see the skinny rectangular part
of the L over here.
Okay? Then the incline part connecting the part
and the top parts, starting from here, draw a line from here
to here and then from here to here.
That tells me that a portion of the bottom part will be hidden.
So I'm going to trim these other edges, press enter,
and then click on this to trim away
that bottom part that's hidden.
And I should probably replace that part of the hidden line.
So going to the hidden line type layer.
That's the hidden line, among other hidden lines
in this drawing. I am going back to object lines.
I forgot this goes inside
of that incline plane seen from the top.
And then I'm going to do a fillet.
As you notice from the drawing,
all the fillets. There's a note saying that all the radius
of R, type R is .25.
So I'm going to use fillet radius of .25. Fillet
that corner -- fillet that corner also.
I'll fillet this one.
Come on, okay.
And finally, fillet this corner.
We're pretty much done.
The only thing's missing are the two holes in the top views,
which will be shown as hidden lines in the right
and front view, and also some hidden lines in the top,
as well as the center line.