I expect it would really be a pain to clean the cookie dough out of this grease cup. 
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Such clean work! It’s deceptively simple but impressive modeling. I’m curious how you did the hex shape at the bottom that blends into the cylinder. Did you make a complete cylinder of the whole body with a flair at the bottom using follow me, then trim away the excess with a hex ID sort of cutting shape?
The threads are masterfully done as well, love how they taper into the body on the top and bottom of the plunger. I remember you had a tutorial on your method posted previously, have to look back through some old “threads” 
to find it.
Thank you. You’re right. It really isn’t very difficult as long as you do things in the right order and maintain clean components. Of course as with the other models I’ve shown, all of the components are solids and could be 3D printed. And as for the hex at the bottom, yes, that’s basically how I did it. In my head, anyway, it would be much like making it for real. That are would be left a bit oversized and then the flats milled. In SketchUp that’s a bit faster because all six flats can be done in one pass.
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Valve control lever for steam engine.
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Early morning post Christmas modeling while waiting for the family to wake up. Cross Head for a horizontal steam engine from about 1895.
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Drain backflow release valve?? Never seen one like that. Nicely done!
no easter egg cage?
Medical device?
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Some sort of ball check valve anyway.I’ve never seen one exactly like that although I’ve worked with plenty of other check valves.
And thank you.
I thought all easter eggs were cage-free. 
I doubt it but maybe. The reference I was working from was published around 1890. The ball is 2-3/4 inches in diameter so I’m not sure what sort of medical application it might have had.
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Don’t leave a setup like that dangling for DaveR.
(one could say easter eggs are free-range until found.)
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Hmmm… Does that mean some free range easter eggs are in order?
I remember something like that on old machines in my younger day. I don’t remember the screw, I think they had a spring.
It reminds me of a pump I saw many years ago. I think it was called a ball pump. There were four of those ball cages, 2 connected antiparallel so to speak , at each end of a slow moving cylinder connected to a crankshaft. For pumping sludge and other thick materials. The balls were made of hard rubber. The piping was such that the 2 suctions and 2 pressures combined to pull material from a low level to a higher level.
A knuckle joint c. 1897.
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I guess this is from the same magazine article:
small world, eh?
Yeah. I guess so. I wasn’t aware of this video when I made the model. Someone else pointed it out to me, though.
A little Sterling engine-powered fan.
Still need to model some machine screws and hex nuts and cut a few threads. Every component is a solid like usual.
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@DaveR …Would you be kind enough to explain what you mean by “every component is a solid…” all faces and edges closed? Each piece complete and distinct from others? No loose geometry laying around? I’m asking this because I gather that is an example of good modeling behavior but I haven’t run into that before.
Thanks as always for your help!