Cycles materials and the rendered image look good. Then I baked the materials. It worked fine for the wood. The baked image texture works well. But for the metal, a procedural texture, the bake did not work at all. I tried reset the normals, did not help.
Possibly the UV's are quite bad. It was imported from a CAD program, and UV's were made automatically. I'm new to UV's, not very good with them. Maybe they need to be re-unwrapped?
Sorry I never did baking before, so I don't even know what might be wrong. Maybe UV's?
How can I fix this problem, and in general, if baking does not work, what should we try to fix?
Blend file here: http://pasteall.org/blend/index.php?id=43341