Auxiliary Views

Sometime you need more than 3 views to tell the whole story

True Size and Shape ( TSS ) is a surface that shows foreshortened traditional views

A surface is TSS when it's edge in the next view is parallel to the fold line

Rule is: skip a view and meausure back

Tolerances

-precise tolerances to insure the interchangeability of parts
-determining the amount a dimension can vary from its regular size

BASE SIZE- exact size of dimension
TOLERANCE- amount a dimension can vary
FEATURE- identify geometry of drawing
LIMITS- max and min of the tolerance
ALLOWANCE- limits where max and min occur
MMC- limit of a dimension where the max material is left on the part
LMC- limit of a dimension where the min amount of material is left on the part
(Running and Sliding) CLEARANCE- all dimensions produce clearance parts
INTERFERENCE- all combinations will produce a force fit
TRANSISTIONAL- different combinations produce different fits

Dimension Notes

DIMENSION NOTES

ANSI- American National Standards Institute ( Dimension Rules Basis)

Basic Rules

•  Make dimensions convenient for person reading them
• No calculations on dimensions
• Do not double dimension
• Dimension line no closer than 3/8 in
• Center Mark goes to quadrant
• Leader scale should = dimension scale
• Leader lines any angle but straight up and down or side to side

Linear

• Make a common corner that dimensions come from
• Big Three ( Height - Width - Depth )
• Dimension in between views
• Do not dimension from hidden lines

Angle

•  Drawn at same angle as the part

Circular

•  Anything less than full circle dimension as radius
• Dimension cylinder in side view

Finished

•  Finished surface always labeled with a check-mark
• Check-mark faces the part

Ordinate Dimensions

• Distance on x and y axis ( from 0,0)
• UCS (enter) / m (enter) / pick point
• put (0,0)

Counterbore - bolt head or screw flush w/ surface

Countersink- bolt or screw flush w/ surace