WEBVTT

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>> This is a tutorial
on lab number 12

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which is secondary
auxiliary view.

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We're given the front
and the right side views.

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And we're asked to construct
first the auxiliary view

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and then the secondary
auxiliary view

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as indicated by the fold lines.

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So I've created some of the
projection lines from points

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in the front view perpendicular

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to the first auxiliary
reference claim,

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just to illustrate
how I did that.

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Sometimes when you create
a construction line it

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automatically appears to
be vertical or horizontal.

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If you're having that problem,

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just try creating the
construction line somewhere else

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where there's no
line yet or objects.

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And you can make
it perpendicular

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to your reference plane.

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Like this one I'm doing.

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And then just copy

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that construction primary
construction line, okay,

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that is not pointing
to any point into --

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from its current location
into the location.

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Say I'm missing one
right in this corner.

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Okay? And then just
erase that initial one

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that you constructed,
not passing through any

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of the details, because
sometimes it automatically does

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a horizontal and vertical.

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Now I've already offsetted the
depth of point A. I'm going

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to do another offset for
point C from this distance

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to the reference plane.

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The original reference plane
in this direction, the distance

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of B the same as A. Now I'm
ready to create plane A, B,

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C in the first auxiliary view.

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Here is the location of
point A in the front,

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and I know that the offset
is the first line here,

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so this must be point
A. Now point B is

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in the same projection
line, construction line,

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and it's the same offset as B.
Therefore, A and B actually --

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this appears -- appears as a
single point and then here is C.

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So in fact plane A, B, C are
appearing on its edge because A

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and B correspond
to the same point.

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Now I'm going to offset
this remaining distance here

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from the right side view

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for this reference
plane on that side.

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And then I'm going to
continue working on the rest

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of the first auxiliary plane.

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I'm going to work
on the top plane.

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So from point C I know

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that there's a C primed directly
behind it in that projection.

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And then for this corner here,

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there's one that's
directly behind it.

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And then the point to the
front of it that is connected

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to point A, so that plane
there is on the top.

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Now this plane on the side,

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we'll just view this
rectangle here.

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And I'm almost done.

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I'm only missing
details for this couple

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of projection lines
coming from the bottom.

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And I know that those
will be hidden lines

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because they will be covered,
so I'm going to create a line.

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So a hidden line from here to
here corresponding to the point

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over -- oh there's
one hidden line

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but it's directly
below the solid line,

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so I don't show that.

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And there's one more
hidden line over here

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in this right lowest
corner and going this way

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and that pretty much completes
the first auxiliary view.

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Now next thing I'm going
to do is I'm going to go

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to a different -- to
a construction layer.

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Say construction layer two.

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And then create projection
lines starting

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from this point perpendicular
to this.

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So this time it worked just fine

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because there are no
existing projection lines yet.

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Copy that construction line
from this point to this point.

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So all the points I see

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in the first auxiliary view I
just create construction lines

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perpendicular to the secondary
auxiliary reference plane.

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One here also.

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One here. One here perpendicular
[phonetic] line and one here

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for points A and B
corresponding to each other.

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And then I'm going
to start offsetting.

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Distances from the primary
auxiliary reference planes

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should be the same as
measured towards the front.

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So point A, for instance,
offset from point A

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to the primary auxiliary
plane, ARP.

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And then from ARP1
to this other side

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for the secondary should
be the same distance.

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Now I'll do this offset for B
to the primary, and this primary

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into the secondary will
be the offset for B.

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And then I'm going -- oh, for
C, I'll do the same thing.

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Here's the offset.

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I want to make sure that it goes
to the perpendicular, okay?

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So this would be the location
for C. So those three lines are

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for A, the widest one will be B
and then C right in the middle.

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Now I'm ready to
create object lines

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with a secondary auxiliary
reference plane starting

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from point A, which
is over here.

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The first, the closest offset,

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so that's AB is along the
same construction line

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but it's the farthest one.

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And C is along this projection.

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It's the middle one and
then it goes back to A.

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So that's the appearance
of A, B,

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C. It's actually a
two [phonetic] sides

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and a second auxiliary
reference plane.

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And I'm going to
go towards here.

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There's a plane over here.

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I'm going to look for those
one by one starting with AB.

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I already have [foreign accent]
I'm going to do the offset

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for the point that's directly
below B, which is this

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to the primary auxiliary
reference plane.

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Offset that to the right for the
secondary and then offset again.

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Going to the next point
will be right here.

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So offset again from this
point to the reference plane.

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The same reference plane ARP1
away towards the secondary

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and then going to the
next point, which is this.

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Offset again from this
to that reference plane.

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And I noticed that
that one is this one,

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which is slightly
further than A.

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And then finally this
point here to that.

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I offset this on the
right side, and it looks

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like it landed right at
the same location offset

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as point A. I have
to remember that.

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Now I'm ready to
[foreign accent] one more

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for the closest one here.

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Distance from here to this.

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Okay. The same reference plane.

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That's the one that corresponds
to the front left top corner,

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which is the closest
to the ARP1.

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So I'm now going to
create from A to B,

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B to the point directly below
these along this projection.

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And I know that that's
the farthest offset.

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So it's over here and the next
point down here will be the left

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of that, which corresponds
to this.

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And I know that that's the one
-- it's along this projection.

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And I know that's the one
that's slightly closer compared

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to point C. So it's not [foreign
accent] C. It's this projection

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here [foreign accent] on that.

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I think that's correct.

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And then I'm going to
go up, which corresponds

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to this projection here.

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And I know that that's
the next one,

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right here in terms of distance.

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And then this point here
is at the same offset as A,

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so along this projection
line [foreign accent].

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Finally the closest point to
my ARP1 would be corresponding

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to this corner and then it
goes back to A. So that plane

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that we just constructed
there is now complete.

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Next thing we want to do
is locate another plane.

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Maybe how about this one here?

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Okay? Starting from
point C, okay,

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to the point directly below
-- behind C. This is point C.

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And this is the point
that's going --

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see there's a point
directly behind that.

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We call that C prime
going to this projection,

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but it's at the same offset,
according to the front view.

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And then from there I
can go towards the --

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okay, the one here is
the top [phonetic] plane

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which corresponds to -- so
I'm working on the top plane,

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which corresponds to this.

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So and that is at the
closest projection.

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So it's this one here and
that's the closest offset

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for a secondary.

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And then it goes back
to the front here.

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Right there.

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That line here corresponds
to this line.

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So it's starting to make sense.

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Now I'm going to work
on the other plane

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that contains point C as
well but the vertical plane.

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So C to the C behind
it, C prime.

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And then it's going to go --

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I'm working on the plane
that's appearing as a vertical

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on the right side on the
front view and it's going

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to go to this point here.

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Okay? At the same -- at the
farthest point at B. Oops.

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I forgot -- it appears
that we --

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I'm missing a projection
to that.

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So copy this -- so I'm
missing a projection.

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This hidden line here
corresponds to the lowest point

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on that -- it's the one that's
directly behind the point below

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point B. So I'm starting
from C prime.

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And I'm going to that point

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that is right there behind
the lowest point behind B

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or below B. It's going
to be the same distance

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as the lowest point, is
the farthest over here.

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And that's -- that's the plane
that is on the right side

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as shown in the front view.

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So it's starting
to make sense now.

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Now let's look at the
plane that is in the back,

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the one that's farthest
from the front.

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So it's going to be
completely hidden.

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So I'm going to start from --
so I'm changing to hidden lines.

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So it's going to be
this plane here starting

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from the point here.

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Okay? It's going to be
similar to the shape of the one

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on key [phonetic] opposite side.

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So I'm going to this point here,
which is along this projection,

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which is the same
offset as this guy here.

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So it goes like that.

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So it's going to be very similar

00:11:58.656 --> 00:12:01.136 A:middle
in shape though on
the other side.

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Then it goes to this.

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I'm just following
sort of the --

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that shape now on
the other side.

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It goes to this, so I
think that's correct.

00:12:15.106 --> 00:12:18.026 A:middle
And then to this,
following that shape.

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Then it goes back to the corner.

00:12:22.966 --> 00:12:25.996 A:middle
Yep. It's sort of a
mirror -- a similar shape.

00:12:26.486 --> 00:12:30.186 A:middle
Then I'm just missing
new lines connecting this

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to this and another one.

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This is for the notch
on the bottom.

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This to this and
I think that's it.

00:12:42.126 --> 00:12:43.886 A:middle
Let's see if it makes sense.

00:12:44.686 --> 00:12:48.026 A:middle
I'm going to zoom
in a little bit.

00:12:48.026 --> 00:12:53.486 A:middle
Okay. Zoom in and I'm going

00:12:53.556 --> 00:12:59.806 A:middle
to turn off all the construction
lines and let's turn off the --

00:13:01.916 --> 00:13:04.516 A:middle
the fold lines as well.

00:13:05.406 --> 00:13:06.966 A:middle
And it looks correct now.