Aux Views

Why use AUX views

• "Sometimes you need more thatn 3 views to tell the whole story"

Auxiliry view

• secondary view used to show the TSS, true shape and size, of a surface that shows foreshortend in all traditional views. " front, right, top"

• A surface is TSS when its edge in the next view is paralell to the fold line
• to make Aux view, SKIP A VIEW AND MEASURE BACK to get proper dims

Tolorance notes

Why are they necessesary

• they hold precise tolorances to insure interchangeability of parts
• process of determining the amount a dim can change fromm its tolorance size

How accurate can 1/4'' be mesured

• .25
• .250
• .2500

Terms

• basic size- the exact size of a dim
• tolorance- amount dims can vary from basic size
• feature- used to identifie the geometery of the drawing being referanced
• limits of size- max and min size allowed
• allowance- limits are where the smallest clearance or largest interfearance occure, measured in MMC

Tolorance Styles

• limits dim- shows the acceptable min and max acceptable dims
• plus or minus dim/ diviation dims- show amount added and subtracted from basic sized to show acceptable dims
• symetrical dims- when + and - are equall

MMC

• max material condition
• the limit of a dim, where the max material is left on the part

LMC

• least material condition
• the limit of a dim where the least amount of material is left on the part

Types of Fit

• clearance- all dim combos produce clearance between parts
• interfearance fit- all combos of dims produce a force fit
• transitional fit- diff combos of dims, produce differant fits  

dim notes

American National Standards Institute (ANSI)

• Establishes the dim standards
• Rules Don't change
• Makes the rules for dim positioning

Why use dims

• discribe the size of an object
• locate details on an object

Basic Rules

• Should be convienent for readers
• no calculations necessary
• no duplications of dims
• first dim line should not be closer than 3/8'' from object
• lines/symbols inside extension lines, if not possible text inside,lines out,if not all outside
• extension lines give a 1/16'' gap between them and object

Leaders

• leader scale = dim scale
• run at angle
• arrow = edge, dot = surface
• cross as few lines as possible
• don't pass through corners

Linear dims

• first 3 big dims: height, width, depth
• between views
• come from view where detail is best shown
• dont dim to hidden lines
• locate from common corner
• smallest dim = closest to object

Angle dim

• drawn at same angle as dim
• use degree symbol: make by typing %%d after text

Circular dims

• Arc = dim as radius
• circle dim as diameter
• cylender dim in side view
• hole dim were its shown with leader

Finished surface

• use a check mark 1/4'' tall

Ordonate dims

• uses distances on X and Y cordonates
• UCS- user cordonate sysyem
• typ: ucs, press enter,move,enter,then pic new origin

Counterbore/ Countersinks

• c'bore is used when a bolt or caphead needs to be flush with a surface, Drill hole is the small hole, c'bore hole is the big hole, in cad type c'bore before diameter of c'bore hole and after type diameter of hole through

Symbols

• Counter bore = a squaired off u
• Deep = an downward facing arrow with horozontile line on top
• Counter sink = V

• c'sinks allows screw head to sit flush
• c'sink anlgle is 82 degrees