141–150 of 223 posts
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Plastics under load have a lower Tg.
Tg changes? Or do you mean they deflect sooner under more load?
Polycarbonate shows little change vs pressure [1]:
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Figured it was experimental; no A&P who cared about his future would install a 3D printed part on a certified aircraft.
Loads of commercial aircraft and jet engine parts are manufactured using additive manufacturing, or ”3D printing”
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In what way is this like vibe-coding -- or do you just mean both are bad? According to the report: > The aircraft owner who installed the modified fuel system stated that the 3D-printed induction elbow was purchased in the USA at an airshow, and he understood from the vendor that it was printed from CF-ABS (carbon fibre – acrylonitrile butadiene styrene) filament material, with a glass transition temperature3 of 105°…
In the report they tested samples of the part and found that they actually had glass transition temperatures of 52.8°C, and 54.0°C... so sounds like the owner fell victim to false advertising.
It's important to note the plane is a Cozy Mk IV, which is an experimental light aircraft that is built at home out of foam and fiberglass by following instructions you get online. The design is very good, and hundreds have been flown over the last ~35 years, but Cozy pilots are the aviation equivalent of people who run Arch Linux as their daily driver; many of them are tweaking their aircraft with some frequency. Th…
Figured it was experimental; no A&P who cared about his future would install a 3D printed part on a certified aircraft.
(Although note that these are not using plastic parts, to be clear.)
I hope 3-D printing becomes obsolete when robots can achieve the same efficiency with using the standard construction materials. That should take away all benefits of 3-D printing over regular builds.
I'm curious, what are "standard construction materials" and "regular builds" to you? And what do you think those robots are made of?
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The difference is, injection molds are expensive. And the type of people who can afford them tend to cover their ass better - or do slightly less insanely dumb things. 3D printing (especially using filament) allows idiots to enter entirely new areas of endeavor.
> 3D printing (especially using filament) allows idiots to enter entirely new areas of endeavor. That's true for any tool.
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Figured it was experimental; no A&P who cared about his future would install a 3D printed part on a certified aircraft.
Actually, I think all of the jet engine manufacturers these days are using 3d printers for some of their parts? Although you usually find the press releases talking about this using the term "additive manufacturing" instead. See, e.g., this press release from 2018 about a notable jet engine manufacturer using 3d printing: https://www.geaerospace.com/news/articles/manufacturing/manu... (Although note that these are no…
They also handle all of the testing of parts to ensure they meet the design spec and they have the equipment to validate each printed part to ensure it doesn't have any major defects.
Taken at face value, this is engineering negligence. I've done industrial design with plastics and 3D printed parts. Regardless of the forming techniques, with plastics you still need to consider properties like minimum melting temperatures, tensile stress, and so forth. Then you must test that rigorously. This is all standard procedure. That information is in the data sheet for the material. I did a quick search and…
Also, strictly as a combo 3D-printing and engine enthusiast: Never with a GUN to my head would I install 3D printed parts in a CAR engine, let alone in an aircraft engine. This is spectacularly poor judgement on the part of the owner.
The fabrication technology doesn't matter. The qualification process, on the other hand ...
This is the primary reason why I never got a pilot's license. I suspect I would spend far too much time making sure the maintenance was up to standard and far too little actually enjoying flying.
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The spec is fiberglass, which has better thermal resistance.
But not that much better compared the better filaments out there. Fair chance it was printed out of PLA, ABS or PETG, by the shade of the part it looks like it was CF loaded filament. A better choice would have been PEEK. But even then, I would have done a lot of on-the-ground testing before trusting my life to a part from the printer.
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Figured it was experimental; no A&P who cared about his future would install a 3D printed part on a certified aircraft.
Actually, I think all of the jet engine manufacturers these days are using 3d printers for some of their parts? Although you usually find the press releases talking about this using the term "additive manufacturing" instead. See, e.g., this press release from 2018 about a notable jet engine manufacturer using 3d printing: https://www.geaerospace.com/news/articles/manufacturing/manu... (Although note that these are no…
The 3D printing isn't the actual problem, as you note.