ISO GPS Practice
Lid Uweld
In this practical example, a plastic lid with a connection area is specified.
The focus is on conical geometries resulting from draft angles and their standards-compliant tolerancing, as typically used for self-tapping screws. The example also covers the application of a local datum system (floating tolerancing), the functional consideration of datum systems, as well as aspects such as free state and general tolerancing.
When purchasing this product, you will receive a video (step-by-step guide) and a PDF file.
Scope of Delivery (Digital Package)
- PDF Handbook with ISO 8015 & ISO 14405-1 dimensioning
- 16:9 HD Explanation Video by Marcus Grella
- Interactive 3D-CAD views of references & tolerance zones
- Optional: Physical 3D-printed haptic models for teams
Note: CAD raw files (STP/STEP) are NOT included for IP protection.
Detailed Description
A plastic cover with a connection area is specified. Particularly relevant in this example are drafted areas, i.e. conical areas, which must be specified.
The need for the conical geometry arises from demoulding draft angles, which are already structurally included in the 3D model. ISO GPS conform descriptions of tapered areas can be a challenge.
A typical geometry used for self-tapping screws will be described.
The question of whether a datum system always needs to be “functionally defined” is examined in this example.
Another focus is the use of a local datum system that is applied to specify the connection geometry.
Secondary relevant in this example are restrain conditions (free state) as well as general tolerances.
Length of explanation video (Step by Step guide) : Approx. 39 min.
Variants: No
Difficulty Level: Suitability 2-3
Description of the level of difficulty (suitability for the user):
1 – The user has basic knowledge but has not yet used ISO GPS frequently in practice and takes first steps.
2 – The user has basic knowledge but is not proof about using ISO GPS and would like to gain more general confidence.
More „special“ or complex modifiers (these are usually listed in the example description) are applied selectively.
3 – The user has sufficient knowledge, can already use frequently used ISO GPS tools without difficulty,
and would like to deepen knowledge selectively based on typical functional descriptions,
which is usually also product-specific (e.g., snapping features (latching hooks) on a plastic injection-molded part, special demand hole patterns, i.e. multi-level patterns etc.)
used in the example (i.e., listed in the description) (e.g., direction only or certain combinations of dimensional tolerancing, as well as SIM or similar modifications).
4 – The user has extensive knowledge, has been working with ISO GPS for a long time,
and would like to learn about very specific applications or modification operations, which usually describe more complex functional requirements and products.
This requires, for example, situation features, reference elements, filter information, association modifiers etc.
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