I have started this project to test the stability of V0.19 and to practice some new techniques introduced in V0.18 sketcher. This model is being created from drawings by J.A.M De Waal (http://www.vapeuretmodelesavapeur.com/t ... pe-4ft.pdf
) of a 1/6 scale originally designed by Robin Dyer (http://www.john-tom.com/OldBookPlans/Cl ... 0Truck.pdf
). PartDesign workbench and mirror and clone tools from the Part workbench were primarily used to create the model. All parts and bodies are in one file. Assembly workbench is not used.
So far, I have completed the basic frame and suspension of the truck and the complete trailer with all the fasteners:
Most of the components are fairly straight forward with the exception of the wheels which turned out to be quite complex. It took several iterations to achieve a valid solid. The problem seemed to be related primarily to the tangency of the large fillet on the webs at the outer diameter.
This is my first time exploring the capability of the CarbonCopy tool in the Sketcher workbench. In previous projects I used shapebinders of master sketches (https://forum.freecadweb.org/viewtopic. ... 97#p230797
) to link all the components in articulating mechanisms. In this model, I am using CarbonCopy to essentially accomplish the same thing.
It begins with a master sketch of the main component to which all the rest of the mechanism attaches. This master sketch is then duplicated (Edit>duplicate selection) to capture its attachment properties. Next, the geometry in this sketch is deleted and replaced by a CarbonCopy which links the duplicated sketch to the master sketch. This CarbonCopy sketch is then duplicated as a starting point for each added feature and for each new body. Any extraneous geometry in the duplicated sketch is converted to construction geometry and new geometry is added as needed and constrained to the construction geometry. In this manner, all of the bodies can be linked as shown in the following screenshots:
CarbonCopy is remarkably stable even for large changes in constraints as demonstrated by this example and somewhat easier to use than shapebinders IMO. One annoying feature of Edit>duplicate of the master sketch is that it kicks the duplicated sketch out of the Body which has to be dragged back into the active body. It seems like it should know that it belongs in the active body.
The only issue I had was with a fillet on the lever which would fail randomly with a change of the lever or arm angle constraints. Other than that, overall, V0.19 has been pleasure to work with so far. Stay tuned for future updates.
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.16653 (Git)
Build type: Release
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/UnitedStates (en_US)