GT & T QUIZ Flashcards
what does RFS mean
regardless of feature size.
datum A is used for?
largest mating surface.
What does position control?
features of size
What does location control?
Features without size
what is MMC used for
It is used for clearance holes.
What does DRF mean
datum reference frame.
what is in the first box
characteristic symbol
what is first in the second box
shape of tolerance zone.
datum feature is?
the part itself.
datum plane is?
The imaginary plane that sits on the surface.
T or F
Rule #1 requires perfect form of a feature at LMC
F
it requires perfect form at MMC
T or F
Form tolerances always use datums
F
T or F
The tolerance in the feature control fame is always a total tolerance and never a plus/minus value.
T
T or F
Feature modifiers can only be used with features of size
T
T or F
Limits of size do not control the orientation relationship between individual features on a part.
T
rule #1 no relation between features.
If a MMC modifier appears in a feature control frame, the size of the tolerance zone will increase by the same amount as the hole gets smaller and smaller.
F
the hole would get bigger and bigger.
DRF is the abbreviation for datum reference feature.
F
Datum Reference Frame
Position tolerance is used to locate features of size and without size?
F
it only controls features of size
when LMC or MMC is applied to a hole pattern, each hole may have a different position tolerance depending on the actual size of each hole.
T
what is the latest AMERICAN national standard on dimensioning and tolerancing.
ASME Y14.5-2009
which of the following is NOT a feature? pin hole slot surface axis tab
axis
a feature is sometnig you can grab
which 2 of the flowing are NOT features of size. hole 2 opposed surfaces individual surface 2 unopposed surfaces spherical surface cylindrical surface
2 unopposed surfaces
individual surface
what is found in the first compartment of a feature control frame.
Geometric Characteristic
what is used to cualify a primary datum
flatness.
The establishment of a datum reference frame on a part:
Determines location of the origin on the part.
sequence to applying Geometric Tolerancing
Establish and qualify a DRF, qualify the features to the DRF, and relate the features to the DRF.
Title block tolerances ever apply to _____ dimensions.
Basic
A ______ modifier is typically used for press fit applications.
RFS
A _____ modifier is typically used for minimum wall thickness applications.
LMC
A _____ modifier is typically used for clearance applications.
MMC
Allowance is defined as the difference between _____ of mating parts.
MMC
Define rule #1
Defines the size and form limits for regular features.
It requires perfect form at MMC.
No relations between features.
what is the method of determining primary, secondary, and tertiary datums?
Largest mating surface.
based on your knowledge so far, what are the 2 strongest characteristics symbols we can use?
position and profile of a surface.
what is virtual size
virtual size is the largest pin that can fit into the worst case hole.
how do you calculate virtual size of a hole at MMC?
take the MMC of a hole and subtract the position tolerance from it.
The datum feature is?
The part itself.
datum feature simulator
The measuring tool used to measure the datum, like a plate
RMB means?
Regardless of material boundary.
when pointing to a diameter where is the datum.
the datum is the axis.
when a datum is qualified in line with a dimension, where is the datum.
the datum is the center plane of the feature.
what happens when a hole pattern is a datum.
two planes are created and a cmm or special fixture is required to inspect.
How many translations and rotations does a plane constrain.
One translation and two rotations.
