Unit 1 Flashcards
what do FORM TOLERANCES control what?
SHAPE
What does ORIENTATION TOLERANCES control
TILT
what does LOCATION TOLERANCES control
LOCATION
how many geometric characteristics
14, 12 because last two arent used
what is a basic dimention
theoretical perfect dimension
limits of size
rule #1
rule #1 definition
defines the size and form limits for features, also requires perfect form at MMC. no relation between features
two names for rule #1
envelope principle and Taylor principle
mating envelope
perfect form envelope at MMC check
local size
spherical cross section check
DRF
datum reference frame
rule #1 what does it limit
form and size
RFS
Regardless of feature size
features without size
surfaces
special rule for form tolerances
cannot reference datum
when would MMC modifier be used
clearance application
when would an RSF modifier be used
press or force fit
when would an LMC modifer be used
wall thickness
geometric tolerences
form, orientation, location
how many geometric characteristics
14 but we use 12
how many orientation controls
3- perpendicularity, angularity, parallelism
how many degrees of freedom
6- 3 translation 3 movement
FCF
feature control frame
DRF
datum reference frame
