This part features swivels which are seemingly attached to clamps that move a pair of pistons back and forth. And by "seemingly", I mean that I can't clearly tell whether or not they are actually attached just by looking at the photos (I was never able to visit the museum myself, so a lot of guess work has to be done by me). Presumably, the swivels on the sides actually push the clamps attached to the pistons back and forth without actually being attached to them:
Look where the arrow is pointing. The swivel doesn't appear to actually be attached to the clamp, and the part where the arrow points to appears to have had a load of paint scratched off over time. So at the moment, this is the only lead I've got as to how this part works.
Here's what I've modelled so far:
I started out by modelling the main body of this section (the part in gold), which I did by making a box, adjusting the size and number of faces as I needed, and extruding the faces in order to match the proportions of the actual machine. From there I added more shapes for the various parts of the machine, with a bit more work going into the swivels and the clamp holding the pistons.
I will use modifiers to smooth it all out when I feel the time is right, but I want to complete the modelling process fist. There is still one little bit that I'm currently stuck on...
These two joints. And I have no idea how they work or how they move, so it seems that there's plenty of guess work for me to do.
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