WEBVTT

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>> This is a short lecture

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on creating assemblies
in SolidWorks.

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We're going to illustrate this
by first creating Tutor 2,

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as instructed in the lab.

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And in creating Tutor
2, you're going to start

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with this base extrude
rectangular feature.

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And then we're going to fillet
these four edges as shown.

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And then we're going to shell.

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Specific instructions are given

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in the tutorial on
SolidWorks itself.

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And then we're going to do a
cut extrude to create this lip.

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And, in creating the
cut feature for the lip,

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we're going to create this
sketch that's composed

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of two curves by
converting entities

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that are already existing.

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The outside of the curve.

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And then offset it to
create the inside curve.

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Rather than drawing outlines by
hand for these curves, we use,

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we copy existing geometry
from the shell feature.

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This technique is fast and easy

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because you already
have your entities.

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You're just offsetting
them and copying them.

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It's more accurate because
the sketch entities are copied

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directly from existing geometry.

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And it's also intelligent.

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It is very important for, a very
important feature of SolidWorks,

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that if we change the, make
some changes in the body itself,

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the sketch gets updated
automatically.

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So just to illustrate
the conversion

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of existing entities
into sketch features.

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It copies one or more curves
into the active sketch,

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but projecting them
onto the sketch plane.

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The curves can be any
edges of any existing face.

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Entities and other sketches
can also be for copying.

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It's fast and easy.

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All you have to do is
click on this tool.

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Select the face for the curve
that you're trying to copy.

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So in this case select
the sketch plane.

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It's right here, this face.

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And we open a new sketch.

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And we select the face or curves
that's we want to convert.

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In this case the selected face.

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And then we click on this
toolbar, convert entities

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on the sketch toolbar.

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So this converts
existing geometry

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into sketches in
the sketch plane.

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The outside edges of
the face are copied

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into the active sketch.

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And then the sketch is
already fully defined.

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No dimensions are needed.

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It's just simply
copying something that's

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already existing.

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And then we're going to
create the inside curve

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by offsetting the outside curve.

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Clicking on this offset
entities on the sketch toolbar.

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Enter the distance value for
the offset, 2 millimeters.

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Select one of the
converted entities.

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And then select "chain" so that
the offset goes all the way

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around the contour.

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So the system generates a
preview, the green image here

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of the resulting offset.

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And you can change the
direction of offset

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by simply positioning your
cursor on the right side

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of the entity here, offsetting.

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So we need to move the
cursor inside a contour

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because we're going
to, the offset is going

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to be a smaller copy
of the original.

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The resulting sketch is
already fully defined.

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And there's only one dimension
that controls the copy.

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That is this 2 millimeter offset

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that is offsetted
inside the contour.

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And that will complete
this lip here for Tutor 2.

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So the Tutor 1 part
file is something

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that you created in
the previous lab.

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And this Tutor 2 is sort of,
we just went over the steps.

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You just follow the specific
steps given in the tutorial,

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in tutorial resources
of SolidWorks.

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And then from these
two parts we're going

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to create... this lab is
about creating assemblies.

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So we're going to put
these two parts together

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into this assembly,
which we're going

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to call the tutor assembly.

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An assembly contains
two or more parts.

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In an assembly, parts are
referred to as components,

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components of the assembly.

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And mates are relationships that
are define the relative position

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of the different components.

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They indicate how
the parts align

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and fit together
in the assembly.

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Components and their
assembly are directly related

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to file linking.

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What that means is any changes
you make in the components

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or the parts will actually
automatically update those

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changes in the assembly
and vice versa.

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If you change anything
in the assembly,

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that actually affects the
original components as well.

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This is one good feature
of SolidWorks as well,

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the linking of the files.

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Changes in the original part
files will automatically

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update assembly.

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And changes made in assembly
will also automatically update.

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So here are the steps in
creating the tutor assembly.

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You open a new file.

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But it's going to be an
assembly document rather

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than a part file.

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And then you open the
two-part file that you're going

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to make an assembly out of.

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Open Tutor 1, that drawing that
you made from the previous lab.

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And Tutor 2, the parts
file that we just create,

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that you just created to
the first part of the lab.

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And then arrange these windows.

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So this would be where the
assembly's going to go.

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This is where Tutor 1 is.

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And this is Tutor 2.

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And to create the tutor
assembly, all you have to do is

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to drag the part icons
into the assembly.

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So we just drag them into
the assembly document.

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And then you can save
the assembly as Tutor.

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So, for instance, here,

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depending on which
component you first place

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into your assembly file, that
first component is placed

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into the assembly
in a fixed position.

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So, if you drag Tutor 1 first,
you will notice that this,

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there's a letter F
in front of tutor.

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That means it's a fixed
component that cannot move.

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If you want to move
this fixed component,

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you have to first
float or unfix it.

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After do you that, drag Tutor
1 into the assembly area,

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you see the design, the
feature manager design tree.

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You see Tutor 1 with the letter
F, indicating that it's fixed.

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And then you drag Tutor 2.

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And, if do you that, the feature
manager design tree will show

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Tutor 2, your assembly,
with a minus sign in front.

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Indicating that it's
underdefined.

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That means its position is
not, it's still floating.

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It's not fixed yet.

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And your next task is
to find the position

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and relative orientation of
Tutor 2 with respect to Tutor 1.

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Because currently Tutor
2 can move in translation

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in two directions as well
as rotate about three axes.

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So you can move the
components by dragging.

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The selected component according
to its available degrees

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of freedom, you can move it.

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So, initially, Tutor 2 can
move in six degrees of freedom.

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Three translations
and three rotations.

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You can manipulate the
position of this unfixed

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or floating component.

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Rotate and dragging it.

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So here's an illustration of the
six degrees of freedom of motion

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of the floating component.

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Translation along X. Translation
along Y. Translation along Z.

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And then three rotations about
each of those three axes.

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The way we fix the relative
position and orientation

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of Tutor 2 with respect
to Tutor 1 is

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by creating what's
called mate relationships.

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These mate relationships align

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and fit together different
components in an assembly.

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For the tutor assembly, in
order to fix the location

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and orientation of Tutor
2 with respect to Tutor 1,

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we need to make three
mates to be defined.

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The first mate is coincident

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between this back
edge here of Tutor 1.

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And the edge of the
lip on Tutor 2.

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So you want this line
here, this edge here

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and this edge here
to be coincident.

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So the name of this mate
relationship is coincident.

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Meaning they are
the same position.

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The second mate is coincident
again between the right face

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of Tutor 1 here,
the green face here,

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and the right face of Tutor 2.

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We want those two
to be coincident.

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Meaning these two faces
are in the same plane.

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And the third mate is, so even
if these two right planes are

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in the same plane or coincident,

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you can still rotate Tutor
2 relative to Tutor 1.

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So defining the six-step
position of Tutor 2,

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we create the third mate by
using the coincident mate again

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between the top face of Tutor
1 and the top face of Tutor 2.

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Just to understand how creating
these mates fixes the position

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and relative orientation of
Tutor 2 with respect to Tutor 1.

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The first mate removes
all degrees

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of freedom except for two.

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So, when we made this edge here
and this edge here coincident,

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what that means is Tutor 2
can no longer move up or down

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or in the Z direction.

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The only translation of motion
is along this axis X. And also,

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if this edge is coincident
with this edge,

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obviously Tutor 2 can no
longer rotate about the Y,

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the vertical, or the Z axis.

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It can only rotate
along the X axis.

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So we have removed all but
two degrees of freedom.

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And the remaining
degrees of freedom,

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as a result of making these two
edges coincident, are moving,

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movement or translation along
the X axis, along the edge.

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And then rotation
around the edge.

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The other four degrees of
freedom have been removed.

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Now, in creating
the second mate,

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we removed one more
degree of freedom.

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So, when the second mate
was making this right face

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coincident with this right face,

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so these two faces should
be in the same plane.

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That means you no longer can
move Tutor 2 in the X direction.

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The only remaining degree

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of freedom is rotating
about the X axis.

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And, finally, the third
mate making the top face

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of Tutor 1 coincident
with top face

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of Tutor 2 removes the
remaining degree of freedom.

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We can no longer rotate.

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Because otherwise those
two planes will not be

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in the same plane, which
is the horizontal plane.

00:12:38.786 --> 00:12:42.626 A:middle
So part of your lab in creating,

00:12:43.776 --> 00:12:45.986 A:middle
second part of your lab
creating assemblies,

00:12:46.616 --> 00:12:51.396 A:middle
you will apply mate
relationships

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for the switchplate
part and two fasteners.

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You have created the switchplate

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and hopefully also the
fastener, the screws here.

00:13:04.966 --> 00:13:08.656 A:middle
And we're going to create a
switchplate-fastener assembly,

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as shown here.

00:13:12.126 --> 00:13:16.176 A:middle
So we will, to fix the position
of the fastener relative

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to the switchplate, we're
going, again, need three mates.

00:13:20.336 --> 00:13:22.566 A:middle
The first mate is concentric.

00:13:23.586 --> 00:13:25.936 A:middle
We're going to make
a concentric mate

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so that this cylindrical face
of the fastener is concentric

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with the cylindrical face of
the hole of the switchplate.

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Concentric means that the center

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of this cylindrical hole
is the same as the center

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of this circular
part of the fastener.

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The second mate is coincident
between the flat back face

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of the fastener right here

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and the front face
of the switchplate.

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So we want this to be flush

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to the front face
of the switchplate.

00:14:06.236 --> 00:14:08.226 A:middle
And, finally, the
third mate will be,

00:14:08.356 --> 00:14:12.816 A:middle
we're going to make
this flat top

00:14:13.686 --> 00:14:22.026 A:middle
of the fastener right there
parallel to the face here.

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So that this edge is here,

00:14:24.006 --> 00:14:27.826 A:middle
these two horizontal lines
are parallel to the top plane.

00:14:27.946 --> 00:14:30.086 A:middle
And that fully defines
the position

00:14:30.086 --> 00:14:32.856 A:middle
of the fastener relative
to the switchplate.

00:14:33.366 --> 00:14:36.496 A:middle
Obviously, when creating
your assemblies for this,

00:14:36.946 --> 00:14:39.996 A:middle
the first object that you need,
the first part you need to drag

00:14:39.996 --> 00:14:42.216 A:middle
into your assembly area
will be the switchplate.

00:14:42.786 --> 00:14:44.666 A:middle
That's the fixed part.

00:14:46.946 --> 00:14:48.876 A:middle
Now, for the lab itself,

00:14:48.876 --> 00:14:50.766 A:middle
in addition to those
tow assemblies,

00:14:51.116 --> 00:14:52.396 A:middle
let's look at the lab.

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So, in addition to Tutor 1
and Tutor 2, the first one

00:14:59.876 --> 00:15:01.866 A:middle
that you create for
your assembly.

00:15:04.356 --> 00:15:05.546 A:middle
And the switchplate.

00:15:05.826 --> 00:15:09.376 A:middle
Here is the step-by-step
instructions on the switchplate.

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Including the creation
of the fastener.

00:15:14.446 --> 00:15:17.906 A:middle
And the creation of
the mates, concentric,

00:15:18.366 --> 00:15:19.726 A:middle
coincident and parallel.

00:15:19.786 --> 00:15:24.486 A:middle
So, in addition to those
two, you're also going

00:15:24.566 --> 00:15:28.586 A:middle
to do another exercise
on assemblies

00:15:29.066 --> 00:15:33.336 A:middle
by assembling the
mechanical claw.

00:15:34.006 --> 00:15:39.546 A:middle
The files for this are on
web access, the part files.

00:15:39.666 --> 00:15:42.756 A:middle
And you're just going to
follow the steps here in order

00:15:42.846 --> 00:15:44.976 A:middle
to create a mechanical claw.