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.STEP/.STP is a commonly used generic solid modeling file. IGES or more commonly known as I guess, is no longer a commonly used file IMHO. Most common are: Parasolid X_T Step/Stp

You can purchase a machinable ceramic called Macor. It is expensive though. https://www.mcmaster.com/macor/material~glass-mica-ceramic/

Hi, I am looking to purchase a copy of the drawings for a Coles Holt Engine. I acquired a set of castings but the drawings were not included (thought they were!). I have purchased a set of excellent bar stock drawings from George Britnell over the weekend, fabulous looking drawings and prompt...