Standard
STD 101-0001
Volvo Group
Version
4
Page
21
4.5 Model values and dimensions
4.5.1 General
This section establishes the requirements for model-value query, and resolved theoretically exact and radial
dimensions, linear and angular distance, and size and limits of dimensions in a data set. It also contains the
common requirements for associativity and dimensions on a model or drawing.
4.5.2 Common
requirements
4.5.2.1 Model-value queries
The following model-value queries shall always be conducted in relation to the absolute or
a user-defined model coordinate system of the DSM:
•
determination of location and orientation of surfaces
•
determination of distance or angle between two surfaces
•
determination of the position (location and orientation) of features of size
•
determination of the feature relation (hole-to-hole spacing and orientation) dimensions within a pattern of
features of size.
Direct query of the model surface or model feature of size is usually conducted for
•
determining the shape (curvature) of surfaces, and
•
determining size value for a feature of size or a pattern of features of size.
4.5.2.2 Resolved dimensions
Dimensions displayed on a model are resolved dimensions. For examples of resolving model
values to displayed dimensions, see table 1. The requirements for resolved dimensions
follow.
a)
To obtain a resolved dimension, a model value shall be rounded to the number of decimal places
required for the design.
b)
All resolved dimensions shall be absolute values.
c)
Rounding shall be in accordance with ISO 31-0:1992.
d)
Resolved dimension preservation and association: a direct and permanent association to the
originating model value shall be established and maintained for every resolved dimension.
e)
Utilization of model or resolved dimensions: the use of model values or resolved dimensions for
analyses and other processes shall be defined in appropriate documentation.
