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Application module:
Default tolerance |
ISO/TS 10303-1052:2014-02(E)
© ISO
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This clause specifies the information requirements for the
Default tolerance
application module. The information requirements are specified as the
Application Reference Model (ARM) of this application module.
NOTE 1 A graphical representation of the information
requirements is given in
Annex C.
NOTE 2 The mapping specification is specified in
5.1. It shows how
the information requirements are met by using common resources and
constructs defined or imported in the MIM schema of this application
module.
This clause defines the information requirements to which implementations shall
conform using the EXPRESS language as defined in ISO 10303-11.
The following begins the
Default_tolerance_arm
schema and identifies the necessary external references.
NOTE 3
For ASME Y14.41-2012 the design model precision should be specified using
Significant_number_of_digits
for the attribute
limit
of a
Tolerance_table_cell
with undefined values for the attributes
tolerance_class
and
cell_value
that is referenced as the only cell for a
General_tolerances
where
tolerance_class
has the value "design model precision"
EXPRESS specification:
*)
SCHEMA Default_tolerance_arm;
(*
The following EXPRESS interface statements specify the elements
imported from the ARMs of other application modules.
EXPRESS specification:
*)
USE FROM
Document_assignment_arm;
--
ISO/TS 10303-1122
USE FROM
Foundation_representation_arm;
--
ISO/TS 10303-1006
USE FROM
Measure_representation_arm;
--
ISO/TS 10303-1118
USE FROM
Default_setting_association_arm;
--
ISO/TS 10303-1809
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Document_assignment_arm |
ISO/TS 10303-1122 |
| Foundation_representation_arm |
ISO/TS 10303-1006 |
| Measure_representation_arm |
ISO/TS 10303-1118 |
| Default_setting_association_arm |
ISO/TS 10303-1809 |
NOTE 2
See Annex C,
Figures
C.1and C.2
for a graphical representation of this schema.
This subclause specifies the ARM types
for this application module. The ARM types and
definitions are specified below.
The cell_entry_select type allows for the designation of the data
types
Plus_minus_toleranced_datum
and
Upper_lower_toleranced_datum.
EXPRESS specification:
*)
TYPE
cell_entry_select =
SELECT
(Plus_minus_toleranced_datum,
Upper_lower_toleranced_datum);
END_TYPE;
(*
The general_tolerance_table_select type allows for the designation of the data
types
General_tolerance_table, Document_version
and
Document.
EXPRESS specification:
*)
TYPE
general_tolerance_table_select =
SELECT
(General_tolerance_table,
Document_version,
Document);
END_TYPE;
(*
The limit_select type allows for the designation of the data
types
Number_of_decimal_places, Significant_number_of_digits
and
Upper_lower_limit.
EXPRESS specification:
*)
TYPE
limit_select =
SELECT
(Number_of_decimal_places,
Significant_number_of_digits,
Upper_lower_limit);
END_TYPE;
(*
This subclause specifies the ARM entities for this
module. Each ARM application entity is an atomic element that
embodies a unique application concept and contains attributes
specifying the data elements of the entity. The ARM
entities and definitions are specified below.
A General_tolerance_table is a table containing information about
General_tolerances.
EXPRESS specification:
*)
ENTITY General_tolerance_table;
tolerance_type : STRING;
INVERSE
cell : SET[1:?] OF Tolerance_table_cell FOR tolerance_table;
END_ENTITY;
(*
Attribute definitions:
tolerance_type:
the kind of the tolerance.
EXAMPLE
length dimensional tolerance.
cell:
an entry in the General_tolerance_table.
There shall exist one or more
Tolerance_table_cell
for the General_tolerance_table.
A General_tolerances is a type of
Default_shape_property.
A General_tolerances is a set of default values for dimension or geometric tolerances.
The default values are specified in a table where the correct tolerance type and values are provided per range of
dimension or according to the number of significant digits of the dimension.
These default values are overwritten by tolerances that are assigned explicitly to particular aspects of the shape.
The concept of general tolerances is defined in ISO 2768.
EXAMPLE
A General_tolerances that specifies, that for the tolerance class 'f' the tolerance value 'FORMULA' is applicable for length
dimensions between 30 mm and 120 mm.
Figure 1 depicts this example.
Figure 1 — General tolerances
EXPRESS specification:
*)
ENTITY General_tolerances
SUBTYPE OF (Default_shape_property);
table_definition : general_tolerance_table_select;
tolerance_class : STRING;
END_ENTITY;
(*
Attribute definitions:
table_definition:
the set of tolerances.
They are defined either in this standard in a
General_tolerance_table
or in an external document.
tolerance_class:
the tolerance class as defined in the tolerance table that applies in the given context.
A Number_of_decimal_places is an entry in a
Tolerance_table_cell
representing the range of applicability of a tolerance value by specifying the presented
number of digits after the decimal separator.
The number of decimal places used for the dimension determines which default
tolerance entry in the general tolerance table is valid for this particular dimension.
EXPRESS specification:
*)
ENTITY Number_of_decimal_places;
number_of_places_after_decimal_separator : INTEGER;
END_ENTITY;
(*
Attribute definitions:
number_of_places_after_decimal_separator:
the number of decimal places used for a dimension specification of a part.
A Plus_minus_toleranced_datum is an entry in a
Tolerance_table_cell
that is a plus minus tolerance directly applied to a dimension.
EXPRESS specification:
*)
ENTITY Plus_minus_toleranced_datum;
tolerance_value : Numerical_item_with_unit;
END_ENTITY;
(*
Attribute definitions:
tolerance_value:
the value with unit that gives the tolerance range between the minus value and the plus value.
A Significant_number_of_digits is an entry in a
Tolerance_table_cell
representing the range of applicability of a tolerance value by specifying the presented number of digits.
The number of digits used for the dimension determines which default tolerance entry in the general tolerance table is valid
for this particular dimension.
EXPRESS specification:
*)
ENTITY Significant_number_of_digits;
number_of_digits : INTEGER;
END_ENTITY;
(*
Attribute definitions:
number_of_digits:
the significant number of digits used for a dimension specification of a part.
A Tolerance_table_cell is one cell of a
General_tolerance_table.
EXAMPLE
Figure 1
depicts an example for a
General_tolerance_table.
EXPRESS specification:
*)
ENTITY Tolerance_table_cell;
cell_value :
OPTIONAL
cell_entry_select;
description : STRING;
limit : limit_select;
tolerance_class :
OPTIONAL
STRING;
tolerance_table : General_tolerance_table;
END_ENTITY;
(*
Attribute definitions:
cell_value:
the tolerance value for this tolerance class.
description:
the text that provides further information about the cell.
limit:
the kind of limit for this tolerance class.
tolerance_class:
the tolerance class.
tolerance_table:
the General_tolerance_table
to which this cell belongs.
An Upper_lower_limit is an entry in a
Tolerance_table_cell
representing the range of applicability of a tolerance value by specifying an upper and a lower limit.
EXPRESS specification:
*)
ENTITY Upper_lower_limit;
upper_limit : Numerical_item_with_unit;
lower_limit : Numerical_item_with_unit;
END_ENTITY;
(*
Attribute definitions:
upper_limit:
the upper value of the value range.
lower_limit:
the lower value of the value range.
An Upper_lower_toleranced_datum is an entry in a
Tolerance_table_cell
that is a tolerance range for a dimension.
EXPRESS specification:
*)
ENTITY Upper_lower_toleranced_datum;
lower_tolerance_value : Numerical_item_with_unit;
upper_tolerance_value : Numerical_item_with_unit;
END_ENTITY;
(*
Attribute definitions:
lower_tolerance_value:
the lower value of the tolerance range.
upper_tolerance_value:
the upper value of the tolerance range.
*)
END_SCHEMA; -- Default_tolerance_arm
(*
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