WEBVTT

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>> This short demonstration
is to help you

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with your lab number 16.

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Your lab on geometric
dimensioning and tolerancing

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for the first part
here, we're supposed

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to create this drawing here.

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Let's assume that I've
already created that.

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And then I'm going to add some

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of the geometric
dimension information given.

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But before I do that, I want
to illustrate for instance how

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to display tolerance and
the dimensions, okay.

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So, let's see.

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I created a drawing.

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Let's say I want to
create the limit tolerance.

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So I go to annotate, I
go to dimension style.

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Okay, I modify it.

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And I change the, what's
this, tolerance is here?

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You go to tolerance tab.

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I'm going to change
it to limits.

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And there's different ways
of expressing tolerance.

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If there's none,
there's no tolerance.

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Basic it comes with
a box around it.

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You can have symmetrical
tolerance, you have deviations

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which is plus or minus limits.

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I'm going to use limits.

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And if you notice that
the limits are it's .05

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for the upper limit and
0 for the lower limit.

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Because if we go back to
the handout again, see this,

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the exact target value,
nominal value is 20

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and the lower limit is 20.00
meaning there's no error.

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And the upper limit is
a positive error of .05.

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That's what I have here, .05 for
the upper and 0 for the lower.

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So you can take that as my
current tolerance setting,

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and I say to mention this, okay.

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Gives you that tolerance limit.

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Now how did I manage to get the
basic dimensions here include

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in frame here?

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You just go back to
dimension style, modify,

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and you simply say
that it is now instead

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of limits, you say it's basic.

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So then the dimension
stay over here from here

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to the center of
the circle here.

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Oops, okay, it's
a basic dimension.

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So on and so forth from
the center of the circle

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to this center line again.

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Okay, that's how you do.

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Now let's start with adding
feature control frames.

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The first one says
that it wanted

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to meet the left hand phase
in the right side view,

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here's the right side view.

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This must be the left hand face.

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It's flat one .01.

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Well, 0.01 and identify the
surface [inaudible] feature A.

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So you want to go to
dimension and then look

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for the feature control
frame, it's right here.

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Okay, here's the first symbol,

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the symbol that we're
looking for a flatness.

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And the tolerance value is 0.01.

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And then they want us to
identify the surface also

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as the feature A. So
[inaudible] A space okay.

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And then you want to
align this with the,

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well it's already here.

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It's the, you want to make
sure that it's aligned

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with the extension
line for that dimension

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for the particular surface.

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It's already there.

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Now for the second one
is make the top surface

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in the front view perpendicular
within .01 relative to the data

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in feature A. And identify this
as feature B, data feature B.

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So perpendicular within .01
relative to A. So let's go here.

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Feature control frame again.

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This time we want
perpendicularity,

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this is perpendicularity with
a tolerance of .01 again.

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And this perpendicular
to data A,

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so this is where our reference
is for the perpendicular.

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And they also want us to
identify this at data feature B.

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And this has to be, it says the
top surface of the front view.

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So want to try to align
your feature control frame,

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but you can also use a liter,
but you can simply align it

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as closely as you can
with the extension line

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for this surface here.

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Now let's go to the third one.

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Make the right hand surface in
the front view perpendicular

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to .01 relative to primary data
feature and secondary feature B

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and identify this
as feature C. So go

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to your feature control
frame again.

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And we want perpendicularity
for the symbol, 0.01,

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you want it to be perpendicular
to B. Oh, for both A and B,

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so the primary data feature A
and secondary data feature B.

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So we want the primary over here
is A. The secondary would be B.

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And you want to define
this also as our C.

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Okay, and that should pertain

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to the right hand side
of the front view.

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So what that means is you
want to align this here

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with that extension line.

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Going on to the fourth one.

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It's very easy, just
follow all of them.

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Make all of the dimensions
basic which I already did.

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Position the four
holes within .07.

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So which four holes?

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So it's a position
control frame this time.

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And cylindrical tolerance.

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Maybe I should do this.

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Maximum material condition
relative to data A, B, okay,

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and C. So how does that work?

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So here's the four holes.

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There is already a dimension
for the four holes, okay.

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Oh, it's already added here.

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So here's the position

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and here's the cylindrical
tolerance.

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So let's see how
you get to that.

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So it's going to be like this.

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So feature control again.

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So the symbol should be position
this one and you click on this

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to indicate that it's a
cylindrical tolerance zone.

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And then you type the actual
value of the tolerance.

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And you indicate that it's a
maximum material condition.

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So M for maximum.

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And then it's with respect to
data A, primary, secondary B,

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and primary tertiary is
C. That's what this was

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over here, it's already there.

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Okay, so just fall
the rest of it.

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I will post the solution, that's
a hint, for the first problem

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on the lab since I won't
be there to help you.

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So that would be
helpful, I would think.

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Now if we go on to the
other parts of the lab,

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so for part two of the lab,
you're going to create this.

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And then after you've created
this drawing, the front view

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on the right side view, I
believe on the second page,

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there is geometric dimensioning
information that you need to add

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to the previous drawing, okay.

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Just following specifications
given.

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So this lab is really
understanding the different

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controls for geometric
dimensioning and how

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to represent them in AutoCAD.

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And then part three, again,
more exercises on this.

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But this time there's
no actual drawing.

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All you have to do is on a
blank file just show the feature

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control pane for each
of these descriptions.

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So basically you
create a new file.

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Let's say, okay.

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And then let's, oh, let's see.

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Let's illustrate how
you're going to do this.

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So for the first one, for
instance, it says the surface

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of this lab within a 5,000ths
of an inch tolerance zone.

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So how do you do that?

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We then flat, we can
be flat so flatness.

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And it's 5,000ths so .005.

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Now how do I indicate, it
said something about inches.

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How do I indicate
that it's inches

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without putting the
units in inches?

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If you guys remember from our
discussion of dimensioning,

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decimal value as in
inches are specified

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without the preceding zero
and you put the preceding zero

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if it's in millimeters.

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So that's how I specify
this is in inches.

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So I think that's it
for the first one.

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So just go to there and maybe
put a number one in front of it.

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Oh, maybe you might want to do.

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Okay, put a one here.

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And then put a two
and put a three and so

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on and so forth, okay.

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Up to ten I think.

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And then just put your feature
control frame right next

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to each number to indicate
what number you're doing.

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Move this here to right here.

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That's the first one.

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Then go on to the second one
wherever it says the surface

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[inaudible] within and
so on and so forth.

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So just create the feature
control frame for each one

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of those and put it
right next to the number.

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So there is no drawing,
it's just an exercise

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on adding feature
control frames based

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on your understanding
of the symbols.

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I think that's it.

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So there's three parts to
do on the lab and, again,

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I will upload access to the
solution for the first one.

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So at least you have something
to follow so you can do it

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without me helping you.