Engineering design EX1

coincident

forces two points to coincide

concentric

makes the center of an arc or circle coincident

point on line

forces a point to lie on a line

tangent

forces a line , circle or arc to be tangent

colinear

forces a line to be colinear to another

parallel

forces a line to be parallel to another

perpendicular

forces a line to be perpendicular to another

symmetric

forces/makes two points symmetric across a centerline

linear dimensional constraints

distance between two points or a point and a line

radial and diametral constraints

specify the radius or diameter of an arc or circle

angular dimensional constraints

angle between two line CANNOT be parallel

are all constraints unique to one part?

NO

variational techniques

solves an equation simultaneously

parametric techniques

solved in a sequential order have only one variable

protrusion

added material

ribs

small thin protrusions of constant thickness

webs

areas of thin material that connect two or more heavier areas on a part

boss

slightly raised circular area

draft

slight angle in the otherwise straight walls of a part

groove

a long shallow cut or annulus

lsland

an elongated or irregularly shaped raised area usually used to provide a flat surface

keyseat

axially oriented slot of finite length on the outside of a shaft

keyway

axially oriented slot that extends the entire length of a hole

slot

a straight long cut with deep vertical walls

spot face

shallow circular depression that has been cut

taper

slight angle in the otherwise cylindrical walls of a part of the

What are the three different types of datum geometries

datum points, datum axes, datum planes

datum points

at a vertex, planar surface, intersection of a line or an axis

datum axes

between two points, along a linear edge, intersection of two planar surfaces

datum planes

three noncolinear points , two intersecting lines

blend

requires at least two profile sketches