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The shaft and pulleys share a common centerline. The constraints of the key are set in relation to the keyseat. A constraint in computer-aided design (CAD) software is a limitation or restriction imposed by a designer or an engineer upon geometric properties [1]: 203 of an entity of a design model (i.e. sketch) that maintains its structure as the model is manipulated.
SolveSpace is a free and open-source 2D/3D constraint-based parametric computer-aided design (CAD) software that supports basic 2D and 3D constructive solid geometry modeling. It is a constraint-based parametric modeler with simple mechanical simulation capabilities. Version 2.1 and onward runs on Windows, Linux and macOS.
Geometric constraint solving is constraint satisfaction in a computational geometry setting, which has primary applications in computer aided design. [1] A problem to be solved consists of a given set of geometric elements and a description of geometric constraints between the elements, which could be non-parametric (tangency, horizontality, coaxiality, etc) or parametric (like distance, angle ...
These processes optimize certain design objectives against a set of design constraints, allowing the final form of the designed object to be "found" based on these constraints. [4] Parametric tools enable reflection of both the associative logic and the geometry of the form generated by the parametric software.
Parametric modeling is obvious and intuitive. But for the first three decades of CAD this was not the case. Modification meant re-draw, or add a new cut or protrusion on top of old ones. Dimensions on engineering drawings were created, instead of shown. Parametric modeling is very powerful, but requires more skill in model creation.
FreeCAD – Parametric 3D CAD modeler with a focus on mechanical engineering, BIM, and product design. LibreCAD – 2D CAD software using AutoCAD-like interface and file format. SolveSpace – 2D and 3D CAD, constraint-based parametric modeler with simple mechanical simulation abilities.
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Granite [6] is developed by Parametric Technology Corporation. C3D Modeler is developed by C3D Labs, part of the ASCON Group. [7] [8] CGAL is an opensource Computational Geometry Algorithms Library which has support for boolean operations on Polyhedra; but no sweep, revolve or NURBS. Open CASCADE is an opensource modeling kernel.