AUXILIARY VIEWS

Some times you need more than 3 views to show everything.
Auxiliary View- secondary view used to show true size and shape of a surface that shows foreshortened in all traditional views.
TSS- True size and shape.
A surface is TSS when it's edge in the next view is parallel to the fold line.
Skip a view and measure back.

TOLERANCES

Tolerance is the process of determining the amount a part can vary.
Basic size-  the exact theoretical size of a dimension.
Tolerance- the amount a dimension can vary from the basic size.
Feature- used to identify the geometry of the drawing being referenced.
Limits- The max. and min. allowable size.
Allowance- the limits where the smallest clearance or largest interface occurs.
MMC- the limit of a dimension where the max. material is left on the part.
LMC- The limit of a dimension where  the least amount of material is left on the part.
Clearance- All dimension combinations will produce clearance between parts.
Interference- All combinations of dimension will produce a force fit.
Transistional- Different combinations of dimensions will produce different kinds of fits.

Dimension Notes

For convenience of person reading drawing.
No calculations necessary.
No Duplicate dimensions.
No closer than 3/8th inch from object.
Leader scale = dimension scale.
LEADERS
Arrow pointing to an edge.
Dot pointed to a surface.
Arrow line at any angle except horizontal or verticle.
As short as possible.
LINEAR DIMENSION.
Length, width, and height 1st things dimensioned.
Off of view where detail is best shown.
Dont dimension from a hidden line.
Locate dimensions from a common corner.
Smallest dimension closest to object.
ANGLE DIMENSION.
Degree = %d.
Arcs are dimensioned as radius.

Circles are dimensioned as diameter.
Diameter symbol=%c
Cylinders are dimensioned in the side view.
Check mark= finished surfaces. 1/4th inch tall.
Ordinate dimensions use distances on the X and Y axis.