Page+Format,+line+sizes+and+text&value+rules

=Page format= = =
 * **__All drawings must have a border. Standard borders included with most CAD systems are recommended.__**
 * **__All drawings must have a border. Standard borders included with most CAD systems are recommended.__**


 * **__All drawings must have a title block that includes the following elements.__**
 * Descriptive part name.
 * University Name (Already printed for you).
 * Name and student number of the person who created the drawing.
 * Date the drawing was created.
 * Indication of units used. (mm)
 * Unless otherwise specified tolerances.
 * Scale indication


 * **__Orthographic Views__**
 * Enough views must be included to completely describe the part.
 * The most descriptive view should be chosen as the front view. For most parts this choice will minimize the number of hidden lines required.
 * The views must be positioned and aligned correctly.
 * Holes and arcs with an included angle of 180 or greater must have center marks and centerlines in appropriate views.
 * Blind holes formed by drilling must have drill points shown unless the design requires otherwise.
 * Features that make the part easier to manufacture or assemble must be incorporated into the part.


 * __**Dimensioning**__
 * Dimensions must specify the size and location of each feature. For example a size dimension and two linear position dimensions are usually required to completely describe the feature
 * Dimensions that determine whether the part assembles or operates correctly must be called out directly and therefore avoid requiring the reader to add or subtract dimensions. This can minimize tolerance stack up problems.
 * Holes that form a pattern must be dimensioned relative to each other and then one hole in the pattern must be located relative to another significant feature
 * No dimensions should appear on a view of the part.
 * Smaller dimensions must be placed closer to the views than larger dimensions
 * Chained dimensions must be aligned.
 * A hole’s size and location should be dimensioned in the profile view.
 * If a full circle or an arc of more than half is a circle is being dimensioned then the diameter is specified, preceded by the diameter symbol. If the arc is less than a half circle, the radius is specified, preceded by an R. (pg. 491 Bertoline and Wiebe)
 * Similar features should be dimensioned in identical ways


 * **__Tolerancing__**
 * Tolerances must be consistent with the capabilities of the intended manufacturing process.
 * Tolerances must be chosen to ensure that the parts assemble and operate correctly when the parts are at the upper or lower limit of their tolerance range.
 * If the minimum clearance between mating parts, the allowance, is zero the parts may not assemble easily. Remember a half-inch peg will not fit in a half-inch hole without force.
 * Dimensions that determine whether the part assembles or operates correctly should have smaller tolerances than dimensions to non-contacting surfaces.
 * Use of “unless otherwise specified” or default tolerances is encouraged to decrease the clutter of a drawing but all dimensions should not have the same tolerance.
 * Remember that you must create a tolerance table at the bottom, left side of the page when doing a page with dimensions on it

= = =Line sizes=

=Rules when adding text or numbering on drawings=

=Center lines=