>> This short demonstration is to help you
with your lab number 16.
Your lab on geometric dimensioning and tolerancing
for the first part here, we're supposed
to create this drawing here.
Let's assume that I've already created that.
And then I'm going to add some
of the geometric dimension information given.
But before I do that, I want to illustrate for instance how
to display tolerance and the dimensions, okay.
So, let's see.
I created a drawing.
Let's say I want to create the limit tolerance.
So I go to annotate, I go to dimension style.
Okay, I modify it.
And I change the, what's this, tolerance is here?
You go to tolerance tab.
I'm going to change it to limits.
And there's different ways of expressing tolerance.
If there's none, there's no tolerance.
Basic it comes with a box around it.
You can have symmetrical tolerance, you have deviations
which is plus or minus limits.
I'm going to use limits.
And if you notice that the limits are it's .05
for the upper limit and 0 for the lower limit.
Because if we go back to the handout again, see this,
the exact target value, nominal value is 20
and the lower limit is 20.00 meaning there's no error.
And the upper limit is a positive error of .05.
That's what I have here, .05 for the upper and 0 for the lower.
So you can take that as my current tolerance setting,
and I say to mention this, okay.
Gives you that tolerance limit.
Now how did I manage to get the basic dimensions here include
in frame here?
You just go back to dimension style, modify,
and you simply say that it is now instead
of limits, you say it's basic.
So then the dimension stay over here from here
to the center of the circle here.
Oops, okay, it's a basic dimension.
So on and so forth from the center of the circle
to this center line again.
Okay, that's how you do.
Now let's start with adding feature control frames.
The first one says that it wanted
to meet the left hand phase in the right side view,
here's the right side view.
This must be the left hand face.
It's flat one .01.
Well, 0.01 and identify the surface [inaudible] feature A.
So you want to go to dimension and then look
for the feature control frame, it's right here.
Okay, here's the first symbol,
the symbol that we're looking for a flatness.
And the tolerance value is 0.01.
And then they want us to identify the surface also
as the feature A. So [inaudible] A space okay.
And then you want to align this with the,
well it's already here.
It's the, you want to make sure that it's aligned
with the extension line for that dimension
for the particular surface.
It's already there.
Now for the second one is make the top surface
in the front view perpendicular within .01 relative to the data
in feature A. And identify this as feature B, data feature B.
So perpendicular within .01 relative to A. So let's go here.
Feature control frame again.
This time we want perpendicularity,
this is perpendicularity with a tolerance of .01 again.
And this perpendicular to data A,
so this is where our reference is for the perpendicular.
And they also want us to identify this at data feature B.
And this has to be, it says the top surface of the front view.
So want to try to align your feature control frame,
but you can also use a liter, but you can simply align it
as closely as you can with the extension line
for this surface here.
Now let's go to the third one.
Make the right hand surface in the front view perpendicular
to .01 relative to primary data feature and secondary feature B
and identify this as feature C. So go
to your feature control frame again.
And we want perpendicularity for the symbol, 0.01,
you want it to be perpendicular to B. Oh, for both A and B,
so the primary data feature A and secondary data feature B.
So we want the primary over here is A. The secondary would be B.
And you want to define this also as our C.
Okay, and that should pertain
to the right hand side of the front view.
So what that means is you want to align this here
with that extension line.
Going on to the fourth one.
It's very easy, just follow all of them.
Make all of the dimensions basic which I already did.
Position the four holes within .07.
So which four holes?
So it's a position control frame this time.
And cylindrical tolerance.
Maybe I should do this.
Maximum material condition relative to data A, B, okay,
and C. So how does that work?
So here's the four holes.
There is already a dimension for the four holes, okay.
Oh, it's already added here.
So here's the position
and here's the cylindrical tolerance.
So let's see how you get to that.
So it's going to be like this.
So feature control again.
So the symbol should be position this one and you click on this
to indicate that it's a cylindrical tolerance zone.
And then you type the actual value of the tolerance.
And you indicate that it's a maximum material condition.
So M for maximum.
And then it's with respect to data A, primary, secondary B,
and primary tertiary is C. That's what this was
over here, it's already there.
Okay, so just fall the rest of it.
I will post the solution, that's a hint, for the first problem
on the lab since I won't be there to help you.
So that would be helpful, I would think.
Now if we go on to the other parts of the lab,
so for part two of the lab, you're going to create this.
And then after you've created this drawing, the front view
on the right side view, I believe on the second page,
there is geometric dimensioning information that you need to add
to the previous drawing, okay.
Just following specifications given.
So this lab is really understanding the different
controls for geometric dimensioning and how
to represent them in AutoCAD.
And then part three, again, more exercises on this.
But this time there's no actual drawing.
All you have to do is on a blank file just show the feature
control pane for each of these descriptions.
So basically you create a new file.
Let's say, okay.
And then let's, oh, let's see.
Let's illustrate how you're going to do this.
So for the first one, for instance, it says the surface
of this lab within a 5,000ths of an inch tolerance zone.
So how do you do that?
We then flat, we can be flat so flatness.
And it's 5,000ths so .005.
Now how do I indicate, it said something about inches.
How do I indicate that it's inches
without putting the units in inches?
If you guys remember from our discussion of dimensioning,
decimal value as in inches are specified
without the preceding zero and you put the preceding zero
if it's in millimeters.
So that's how I specify this is in inches.
So I think that's it for the first one.
So just go to there and maybe put a number one in front of it.
Oh, maybe you might want to do.
Okay, put a one here.
And then put a two and put a three and so
on and so forth, okay.
Up to ten I think.
And then just put your feature control frame right next
to each number to indicate what number you're doing.
Move this here to right here.
That's the first one.
Then go on to the second one wherever it says the surface
[inaudible] within and so on and so forth.
So just create the feature control frame for each one
of those and put it right next to the number.
So there is no drawing, it's just an exercise
on adding feature control frames based
on your understanding of the symbols.
I think that's it.
So there's three parts to do on the lab and, again,
I will upload access to the solution for the first one.
So at least you have something to follow so you can do it
without me helping you.