Design Guidelines for creating the drawings as per ISO

Tolerances are categorized into five types. These tolerance types include form, profile, orientation, runout, and location. This section will discuss primarily those tolerances that relate to die casting. The Below mentioned details identifies common geometric characteristics, their symbols, their type, and the features to which they apply.

The below table entitles the requirements of the datum's with respective to the features of the part.

Tolerance Frame :

Primary Datum, Secondary Datum, and Tertiary Datum Planes: Datums must be perpendicular to each other.

Primary Datum Plane: The primary datum is selected to provide functional relationships, standardizations and repeatability between surfaces. A standardization of size is desired in the manufacturing of a part. Consideration of how parts are orientated to each other is very important. The chosen primary datum must insure precise measurements.

Secondary Datum Plane: Secondary datums are produced perpendicular to the primary datum so measurements can be referenced from them.

Tertiary Datum Plane: Tertiary datum is always perpendicular to both the primary and secondary datums ensuring a fixed position from three related parts.


Hatching for Assembly :

As Per ISO,fasteners in the cross section view shall not be hatched.