WEBVTT

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>> This lecture is on three
construction techniques

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on SolidWorks.

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They are the loft, the
revolve, and sweep.

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And there are techniques similar
to this in AutoCAD as well.

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So, let's start with the loft.

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Loft blends multiple
profiles together.

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A loft feature can be
a base, boss, or a cut.

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And to create a simple
loft feature,

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what you do is you
create the planes.

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It's required for
the profile sketches.

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So, you create the series of
sketches on different planes.

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And then a sketch profile
on the first plane.

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Sketch a profile on the other
remaining planes like this.

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So, here is the first sketch
plane is the front and parallel

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to that is plane one,
plane two, and plane three.

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And you have different
profiles on it.

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And then you loft it.

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Selecting each profile in order

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and examine the preview
curve and the connectors.

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The dots here.

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And click OK.

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And it will create for your
lab, the handle of the chisel.

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More information about loft.

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It's very important to be neat

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so that the program
doesn't get confused

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on how you want to
create a loft.

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You need to select
the profiles in order.

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That they are connected.

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Click corresponding
points on each profile.

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The vertex closest to the
selection point is used.

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And you can drag the connectors

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to improve the connection
if you want.

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A preview curve connection the
profile is displayed right here.

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And you can drag the connectors.

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Review the curve in order
to address adjustments

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if needed before clicking OK.

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Neatness counts.

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You may have unexpected
results if you have some errors

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like this for instance.

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It's twisted.

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And that happens when your,

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the points on your profiles are
not the corresponding points

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that they should be.

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Neatness counts.

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You can have, rebuild
errors, for instance,

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if your profiles are
in the wrong order.

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So, here's one, two, three,
four rather than going this way.

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So, to create, so let's
go through the steps.

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To create an offset
plane, hold down control.

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And then drag the front plane

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in the direction you
want to offset it.

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This is a common
technique in Windows.

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The property manager appears.

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And then you select
this offset distance.

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Change it to 25 millimeters.

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And click OK.

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And what happens is here
is the original front

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that you're trying to offset.

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It creates this new plane
called plane one that's

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at the distance of 25.

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You can do a similar technique

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to create the other
two profile planes.

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Plane two at a distance of 25
from plane one and plane three

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with a distance of
40 from plane two.

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Verify the positions of
the planes by clicking

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on the view, on view planes.

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Double click on the planes to
see their offset dimensions.

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After you create the planes, you
create, you sketch the profiles.

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So, the loft that we're going

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to create is based
on four profiles.

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Each profile is on
a separate plane.

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To create the first profile,
this is on the front view

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and we sketch a square.

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It might be better to make your
square right in the center.

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The center of the square is
right in the origin rather

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than the origin being
on one of the vertices.

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By selection sketch center
rectangle at an equal relation

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to the horizontal
and vertical lines.

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It becomes a square.

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And then add the dimension on
one of the sides automatically.

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The other sides would also
be the same dimension.

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And then sketch the
remaining profiles.

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Opening a sketch on plane one.

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Sketch a circle and
dimensions shown here.

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The center is at the origin,

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which is at the center
of the first profile square.

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Exit sketch.

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Open sketch on plane two, and
you're going to create a circle

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that is circumscribing the
original square as shown.

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So, the corners of the square
should be touching the circle.

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And then exit sketch.

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And then the last profile
is simply copying the circle

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from plane two to plane three.

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So, you click edit copy or click
copy on the standard toolbar.

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Select plane three

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in the Feature Manager
design tree area.

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Click edit, past.

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And then a new sketch four
is created on plane three.

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By the way, when
you're copying sketches,

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external relations are deleted.

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For example, when we
copied sketch three,

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the geometric relations
containing,

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or locating the center
of that circle

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and defining the
circumference were deleted.

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So, sketch four is
actually under defined.

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So, we need to define
it, fully define it

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by making it co-radial,
adding the co-radial relation

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between the copied circle
and the original circle.

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If you sketch a profile
on the wrong plane,

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move it to the correct plane
using edit sketch plane.

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Do not copy it.

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To move a sketch to a different
plan, right click the sketch

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in the Feature Manager design
tree and edit sketch plane

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from the shortcut menu.

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Select a different plane.

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And click OK.

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It moves it to the
correct plane.

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Now, what the loft feature does,
it blends together the profiles

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that were created in order to
create the handle of the chisel

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that we're making in our model.

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So, you click on
the lofted boss/base

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on the feature toolbar.

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And here's an illustration
of how you create the loft.

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Select each of the profiles
on plane, on the front plane,

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plane one, plane
two, plane three.

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Examine the preview
curve right here.

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Make sure that it makes
sense and they're correct.

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The sketch, and make sure

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that the sketches are
listed in the correct order.

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Sketch one, sketch two,
sketch three, and sketch four.

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You can move specific
sketches by doing the up

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and down arrows here in order
to arrange them correctly.

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And then you click OK.

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And what happens is
you created a loft

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by connecting the four
profiles that we made.

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We're going to create
another loft feature

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for the bit of the
chisel itself.

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So, the second loft feature
is composed of two profiles.

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One sketch five and
one on sketch six.

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To create sketch five,
we're going to create,

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we're going to select the
square face of our sketch plane.

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Then we open a sketch and
click convert entities.

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So, what it does
is the boundaries

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of this face becomes
our sketch plane,

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our sketch, which is a square.

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Then I just sketch.

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For sketch six, we offset plane
four behind the front plane.

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So, it's at the distance of 200.

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You can create it the same way
that you created planes one,

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two, three by holding down
control and dragging front plane

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in the direction
you want it to go.

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And then you can adjust
the distance to 200.

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Now, open a sketch
on plane four.

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And on this sketch plane, you
create this narrow rectangle

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with these dimensions.

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Also center rectangle
and exit the sketch.

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Then you create the second
loft feature by clicking

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on the lofted boss/base
on the features manager.

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This icon here.

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Select the two sketches.

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Sketch five and sketch
six down here.

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And example the preview.

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In this case to be the,
they're being connected

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by straight lines because
there's only two profiles.

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And click OK.

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And lofted chisel
looks like this now.

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Now, revolve feature.

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A revolve feature is created
by rotating a 2D profile

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around an axis of revolution.

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You did a similar thing in
one of our labs in AutoCAD.

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You created a 2D profile.

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And then you selected an axis
of revolution and revolve it

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in order to create a
solid of revolution.

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It works exactly the same way.

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The profile sketch can use
a sketch line or center line

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as the axis of revolution.

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So, here's the center line.

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Or it can be one of the
edges of the sketch.

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The profile sketch
cannot cross the axis

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of revolution like
this right here.

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So, it could be right
on an edge or outside.

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This will create a hole in the
middle when you revolve it.

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This one will make
it completely solid.

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This one is not allowed.

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You select the sketch plane.

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And then you sketch the 2D
profile here using these

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dimensions given.

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Then you can also sketch a
center line, which is optional

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because I said you can
use this line itself

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as your axis of revolution.

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The axis of revolution must be
in the sketch with the profile.

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It cannot be in a
separate sketch.

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It should be part of the
sketch that you made.

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The profile must but
cross the center line.

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We already talked about that.

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Then you click revolved
boss/base.

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This icon here.

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Specify the angle of rotation.

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We want it to go around
completely, 360 degrees.

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And it creates this
solid of revolution

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as our starting feature,
base feature

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for the lab that we're making.

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Now, finally, the
overview, the sweep feature.

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It is created by moving a
2D profile along a path.

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So, it's like an
intelligent extrude,

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this extrudes usually along
a straight line perpendicular

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to the profile itself.

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Here it is sweeping it
along a specified path.

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A sweep feature is
used to create

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in our lab the handle
of a candlestick.

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Oh, it's not a lab.

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It's a candle stick.

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The sweep feature requires
two sketches, the sweep path,

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here's the path here along
which you sweep the section.

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The sweep path is a set

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of sketched curves
containing the sketch, a curve,

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or a set of model edges.

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The sweep section must
be a closed contour.

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And our example would
be an ellipse.

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The start point of
the path must lie

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on the plane of the
sweep section.

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And the second, path,

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or resulting solid cannot
be self-intersecting.

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Again, it will get confused.

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Now you want to create
your solid as you sweep it.

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You can first create the path.

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And then you make the section.

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Create small cross sections
away from the other part

00:12:45.686 --> 00:12:49.626 A:middle
of the geometry because you
can simply move it later

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by using coincident
or pierce relation

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to the end of the sweep path.

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That will actually
guarantee that the beginning

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of the sweep path is in the
same plane as the sweep section.

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So, let's create the sweep path.

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Open a sketch on
the front plane.

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Sketch the sweep
path using the line

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and tangent arc sketch
tools as shown here.

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So, I see some lines
and tangent arcs

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to create this using
the dimensions shown.

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And then close the sketch.

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Then create the sweep section.

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Open the sketch on the
right plane, for instance.

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Sketch the sweep section as an
ellipse with these dimension.

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Major axis 35.

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Minor axis 10.

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And made the major
axis horizontal

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by adding the horizontal
relation.

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Dimension, smart dimension
to the correct dimension.

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And then you move
this sweep section

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by adding a coincident
relation between the center

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of the ellipse and the endpoint

00:14:11.026 --> 00:14:13.746 A:middle
or the beginning
point of the path.

00:14:15.096 --> 00:14:16.306 A:middle
So, it makes coincident.

00:14:16.846 --> 00:14:20.116 A:middle
So, the starting point here is

00:14:20.116 --> 00:14:22.486 A:middle
in the same plane
as the ellipse.

00:14:23.046 --> 00:14:27.986 A:middle
And you close the sketch
and select swept boss/base

00:14:28.686 --> 00:14:30.506 A:middle
on the feature toolbar.

00:14:30.716 --> 00:14:31.556 A:middle
There's the symbol.

00:14:32.316 --> 00:14:33.486 A:middle
Select the sweep path.

00:14:34.666 --> 00:14:35.506 A:middle
Sketch three.

00:14:37.806 --> 00:14:40.766 A:middle
And select the sweep
section sketch too.

00:14:40.766 --> 00:14:42.426 A:middle
And then click OK.

00:14:42.426 --> 00:14:49.496 A:middle
And then the result is this
swept feature that serves

00:14:49.496 --> 00:14:51.726 A:middle
as the handle of
our candlestick.