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Reply to "Continuing Saga …"

Thanks Mark! The last one printed as good as the other two.

Then I decided to try pushing the envelope. I'm aggressively working to finish detailing out the diesel. Little by little I'm adding details to the front and started working on the massive blower end just for a change of view. I'm trying to decide just how to print it. I wanted to try to see just how small I could practically print. 

I separated out the throttle mechanism including the Woodward Governor to print as a subassembly that I'd glue on separately.

Screen Shot 2019-07-28 at 7.49.14 PM

I copied this mechanism to a separate file so I could work on it more easily. I added some diagonal bracing that I would remove after printing. 

Screen Shot 2019-07-28 at 7.51.27 PM

I almost doubled the thickness of the linking rods. Even with that, although the print was effectively perfect, those little extensions that connect to the heads (and ultimately the fuel rack) broke off when I attempted to snip off the supports. They're just too fragile.  Not having anything in the image for scale, I measured the rods and their .021". That's okay if you're using brass or piano wire, but not resin. I imagine they might work if I added about 50% to the rods and cranks. The governor printed nicely and could work as is. Even contemplating using real wire, the cranks are so minuscule that you couldn't drill them to accept the metal. If all metal, I could solder it.

567 Failed Throttle Linkage

There are two choices. I could enlarge the very fragile parts so they'd function, or make the fragile parts as a relief on a flat background that would hold it all together. With 3D printing the rods could be free of the surface and the cranks attached perfecting the illusion. 

This was printed at 30 microns per layer and 7 second exposure. The detail was awesome and the print did work perfectly. It's all in the design now.

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Images (3)
  • Screen Shot 2019-07-28 at 7.49.14 PM
  • Screen Shot 2019-07-28 at 7.51.27 PM
  • 567 Failed Throttle Linkage

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