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3D CAD drawing:
1, Introduction and some drafts of 3D CAD drawings:
With a 3D-printer the world opens up for a fantastic opportunity to make your own parts for your projects. You can design them after your own ideas. But there is a problem, to do this you must know how to use a 3D CAD program.
It's 15 years since I used a CAD program, but lately I have done some illustrations in SketchUp. Maybe it's possible to use SketchUp for 3D-printing, but I want to do much more advanced things like printing pulleys. My friend Lars has introduced me to FreeCAD and I'm now practicing how to make drawings with that tool.
Software I use which are free to download:
There are a lot of other software too, use the one you are used to.
General information about 3D CAD:
There are also a lot of free 3D CAD for astronomy among others to download if you don't want to make your own drawings:
SketchUp is very useful when you want to do something quick, an illustration or something alike.
Just take some minute. A friend to me use it to make 3D prints.
I want to do more advanced drawings, pulleys. To do that I need a more advanced 3D CAD tool. My friend Lars has introduced me to FreeCAD. Above is a draft he has made for a Canon EF bayonet mount. I'm a little bit skeptical, can that piece of plastic hold a heavy DSLR lens or camera ?
Lars project at Thingiverse:
The software development with a possible ASCOM driver comes later att Github. The idea is to take control over the lens' focus motor.
To FreeCAD there are a lot of macros and plugins to download. Here I have made my first simple CAD drawing of a pulley.
A bigger pulley that I plan to wrap around the barrel that focus the lens.
When looking for tube rings I never find any that fits perfect, now I can 3D print them to any size and shape.
When you get really skilled you can make drawings like these: