Lecture 4 Flashcards
What are the two types of working drawings
Detail and assembly
What do detail drawings communicate
Shape of features, Size and location of features, size, and materials finish and quailty
What is the purpose of dimensions
To provide a clear and complete descrition of the object
What are the dimensioning guidlines
acuracy, clearness, completeness and readability.
What is a dimension line
a thin line, broken in the middle to allow dimension value with arrows at each end
what are the dimensions of the arrow head
3mm long and 1mm wide
What does an extension line do
entends a line on the object to the dimension line
How far should the first dimension line be from the object
12mm or .6 inch
where do extension lines begin
1.5mm from the object and 3mm from the last dimension line
What is a leader
A thin line used to connect a dimension with a particualr area
What are the different dimenson categorys
Linear
Angular
Cylindrical
Radial
When is the cylindrical dimension category used
non hole single curved surfaces
when is radial dim cat used
for curved surfaces under 180 deg
What are dimension rules
dimensions should be in most descritive view
dim are read from bot of page to the top
show machining processes with callouts
How far apart should parallel dimensions be
1/4 inch
