Mid term Preview

Question 1

Identify the American standard for GD&T

Answer 1

ASME Y14.5-2009

Question 2

Identify when a feature is at MMC or LMC

Answer 2

At MMC a hole is the smallest it can be
At LMC a hole is at its largest.
At MMC a shaft is the largest it can be
At LMC a shaft is the smallest it can be.

Question 3

Identify different types of fits

Answer 3

Clearance fits

Interference fits.

Question 4

Define a basic dimension

Answer 4

theroticly perfect
title box tolerences do not apply.
box or rectangle around the dimenson

Question 5

Interpret & apply Rule #1

Answer 5

known as Taylor and envelope principle. 
thereoticly perfect
perfect form at MMC
no relation between features. 
Defines size and form limits.

Question 6

How many degrees of freedom does a plane control.

Answer 6

3, 1 translation and two rotation.

Question 7

What are the six degrees of freedom?

Answer 7

X,Y,Z U,V,W

Question 8

What is the equation for allowance and what is the definition?

Answer 8

Allowance is the tightest fit between mating features.

MMC of hole minus MMC of shaft.

Question 9

Define MMB

Answer 9

Maximum material boundary. is applied to a datum and means the greatest external and least internal size the shape can be relation to any higher precedence datums.

Question 10

what are the Datum feature modifiers?

Answer 10

Datum feature modifiers define the size or condition of the datum feature simulator.
maximum material boundary (MMB), Least Material boundary (LMB), Regardless of Material Boundary (RMB)

Question 11

define LMB

Answer 11

Least Material boundary. is applied to a datum and means the least external and greatest internal size the shape can be relation to any higher precedence datums.

Question 12

Define RMB

Answer 12

Regardless of Material Boundary.

Question 13

For a slot, if you are given a MMB value of 10 and a MMC of 11 what is the positional tolerance?

Answer 13

(circle m) +- tolerance. 10=11-? = 1

Question 14

If you are given a 5.0 virtual size of a hole & position tolerance of .25, what is your MMC value?

Answer 14

5.25. 5= 5.25-?

Question 15

what are the three tolerance zone shapes you have learned so far

Answer 15

cylinder,
2 parallel planes,
uniform 3D boundary.

Question 16

what type of of application would a MMC modifier be used for?

Answer 16

MMC= clearance

Question 17

for what type of application would a LMC feature modifier be used for?

Answer 17

wall thickness control

Question 18

for what type of application would a RFS feature modifier be used for?

Answer 18

a press fit.

Question 19

On what type of parts would datum targets be applicable?

Answer 19

Organic surfaces like a casting or molding.

Question 20

what are the datum targets and how are they shown.

Answer 20

area - shown as a shape in one view and a point in the other
line - shown as a line in one view and a point in the other
point- shown as a point in one view and a point in the other.

Question 21

what is the symbol for the term “Between”

Question 22

Identify the “american” standard for GD&T

Answer 22

ASME Y 14.5-2009

Question 23

Identify when a feature is MMC or LMC

Answer 23

MMC is a circle with a M

LMC is a circle with a L

Question 24

Identify the different types of fits.

Answer 24

clearance, interference

it can be on more thean a cylinder and hole, it can be on a shaft and slot.

Question 25

define a basic dimension and show it on a drawing.

Answer 25

theoretically perfect, title box tolerance dose not apply

there is a box around the dimension.

Question 26

interpert and apply rule number 1

Answer 26

also known as the Taylor and envelope principle.
difines size and form limits,
perfect at MMC,
NO relation between features. (length of the feature dose not matter)

Question 27

be abel to apply form tollerances

Answer 27

four total,
flatness- two parallel planes.
straightness
(controls form of size and non size features/ datum reference not allowed)

cylindrical
circularity(roundness)
(controls form of size features. no datum reference)

Question 28

be able to apply Orientation tolerances

Answer 28

there are three
perpendicularity
parallelism
angularity

(controls orientation of surfaces

Question 29

be able to apply location tolerances

Answer 29

position
(controls center points, axes and median planes for size features. can also control orientation.)
- controls features of size

profile of a surface.
(locates surface, can also be sued to control size, form, and orientation of surfaces based on datum reference.)
- controls features without size.
all dimensions that locate and control a surface are basic

Question 30

calculate and describe clearance

Answer 30

clearance is the loosest fit between mating surfaces

LMC hole - LMC of shaft

Question 31

calculate and describe allowance.

Answer 31

allowance is the tightest fit between mating surfaces

MMC of hole - MMC of shaft.

Question 32

Identify feature modifiers and explain the application for each.

Answer 32

RFS- press fit
MMC- clearance fit
LMC - wall thickness

Question 33

calculate virtual size

Answer 33

hole appear smaller and shafts appear larger.

MMC + or - tolerance

Question 34

calculate MMB

Answer 34

same as virtual size.
hole appear smaller and shafts appear larger.
MMC + or - tolerance

Question 35

datum symbol

Answer 35

arrow with leader line to boxed letter.

Question 36

datum feature

Answer 36

the part itslef

Question 37

datum feature simulator

Answer 37

physical equipment

plate, pin, CMM

Question 38

simulated datum

Answer 38

Based off feature simulator.

allows for tolerance in the machine. like a wobbling chuck.

Question 39

datum

Answer 39

theoretically perfect.

plane, axis, shape.

Question 40

6 degrees of freedom

Answer 40

X,Y,Z U,V,W
X/U
Y/V
Z/W

Question 41

identify the three datum targets and how they appear on a drawing

Answer 41

area
a shape + an X
line
a line + an X
point
X + X