This is a model of a tube bender designed by C. Horace Clarke (1956). Drawings can be found in the Model Engineer magazine dated 22 March 1956, pp.470-473.
The model was created with the Assembly4/PartDesign workbench using a top-down, in-context approach referencing a master sketch of all the articulating components. All parts including ISO fasteners were created in one file and then assembled and animated with the Assembly4 workbench.
The Assembly4 workbench provides a convenient means to assemble Parts using Links and local coordinate systems (LCS) from separate Part files or from Parts in the same file, the latter which nicely facilitates a top-down design work process. A simple master sketch is used as the assembly solver for any combination of variables.
Several screenshots are as follows with a few comments on the design process:
The Assembly4 workbench has become my go to workbench when working on articulating assemblies or those in which key dimensions must change parametrically for given design variables. IMHO it is a serious no-frills essential tool for top-down design and in-context modelling.
EDIT: The Assembly4 > Add Variables tool is especially valuable and quite useful for any model, an example as shown in:
https://forum.freecadweb.org/viewtopic. ... 40#p363215
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.19311 (Git)
Build type: Release
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)