GD&T FINAL Flashcards
The flatness control is what?
two parallel planes
flatness- per unit ares do what?
prevent abrupt surface changes.
straightness of a surface is 2 or 3 D
2D
two parallel lines on a surface.
direction of measurement is parallel to the plane you are pointing to.
pointing to the surface means parallel lines on shaft.
straightness of an axis is 2d or 3d
3D
point to the dimension means cylinder.
Can any of the form tolerances have datum references in the feature control frame?
no.
Can any of the form tolerances have feature modifiers applied?
yes, strightness of an axis.
List the 2D form tolerances
straightness line elements, circularity.
List the 3D form tolerances.
straightness of an axis, flatness, cylindricity.
what rule in geometric tolerancing automatically controls the form of a feature within the specified limits of a size?
Rule #1
Name the orientation tolerances
angularity, parallelism, perpendicularity
are datums always required with orientation tolerances?
Yes
which of the orientation symbols may be used in place of the other two symbols
Angularity.
position control controls?
axis control
Axis to axis
does not control form
orientation
location
total run out controls?
surface control
is tighter then position
form
orientation
location
circular controls?
2d version of total run out.
2D
application for hoses pipes and stuff
controls the circularity of a single ring in the cylinder at a time.
profile of a surface controls?
surface control Form Orientation Location Size
what is the difference between total runout and position on a cylindrical part if the numbers are the same
Total run out controls the form.
what can have a feature modifier of lmc or mmc applied
position
runout
profile
position.
why would flatness per unit area be used on a surface?
To prevent abrupt surface changes
what is the benefit of applying a perpendicularity at the value of 0 @ MMC for a cylindrical part.
It will give you more bonus size tolerance.
what is the difference between referencing 1/2/3 datum features when specifying a perpendicular control
it restricts more degrees of freedom.
when is composite position tolerance used?
when the pattern is more important to itself then to the DRF
define rule #1
known as Taylor and envelope principle. thereoticly perfect perfect form at MMC no relation between features. Defines size and form limits.
