How would this compare against producing a 3D mesh using traditional photogrammetry and comparing the CAD model and mesh for deviations? Or would this be unrealistic since the photogrammetrically produced mesh would lack the level of detail required?
Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
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Re: Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
#22How would this compare against producing a 3D mesh using traditional photogrammetry and comparing the CAD model and mesh for deviations? Or would this be unrealistic since the photogrammetrically produced mesh would lack the level of detail required?
That's a great idea - especially because photogrammetry with high quality cameras can have way higher detail than most of the common 3D sensors (realsenses, luxonis, etc). The big problems there are the computation cost and/or set up complexity of photogrammetry. You either need to do a lot of computation (a couple minutes on my RTX 4090 last time I did it for a medium sized object) to estimate keypoints and disparities or you need a really well calibrated ring of cameras, some way to feed parts through it at line rate, but could get away with less compute.
A laser scanner would probably make the mesh comparison approach easier, but it's still incredibly hard to get a really accurate and high resolution depth map in a short time span - especially if the parts are actively moving.
Re: Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
#23Mechanical engineer turned software engineer here; I love this kind of stuff and I frequently wonder how I might apply my software expertise to that domain again. Amongst other things I worked in automotive and the components I worked on were forged and heat treated high strength steels. The defects in forged components are often very small (tens of microns) but I'd be curious if this could work there. We used powerful microscopes - including electron microscopes - on the production lines so maybe that would work?
Re: Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
#24Earlier quoted context omitted.
> Do you see what I mean? Technology doesn't change the relative costs, which matter, even if it changes the absolute costs, which don't. I get what you're saying, and I somewhat agree. But I think it does leave out the desire some consumers have to purchase domestic. For example, I might be willing to buy a domestically made vehicle if the price is under $25K even if it's more than a similar vehicle made overseas. B…
The idea of the domestically manufactured vehicle is just that, an idea. There's the fiction of quota and part manifests. Then there's the reality that, well I assemble a thousand parts in China into one "part" then I import that one "part." There are a ton of people employed by the autos industry in the US but that's so broad. It basically means there are a ton of people employed by organizing our life around cars.…
That's a fair point. Personally, I don't want a car at all but it's highly impractical for me not to have one where I live. I didn't own a car until my 30s and before that I biked or took the bus everywhere. However, where I am now public transit is severely lacking and the weather is often not conducive to biking.
Re: Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
#25Mechanical engineer turned software engineer here; I love this kind of stuff and I frequently wonder how I might apply my software expertise to that domain again. Amongst other things I worked in automotive and the components I worked on were forged and heat treated high strength steels. The defects in forged components are often very small (tens of microns) but I'd be curious if this could work there. We used powerf…
That's another very, very interesting case we thought about tackling. That sounds like something that's ripe for transformer-based vision models to keep the overall size of the model down.
What kind of timescales do you get when measuring parts in an electron microscope case? Are these crankshafts whizzing by, or something like a ship propeller where people spend days making sure every inch is covered?
Re: Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
#26What is the difference between this and traditional FEA done on CAD models? Is this purely a cost benefit?
Re: Launch HN: Bucket Robotics (YC S24) – Defect detection for molded and cast parts
#27Mechanical engineer turned software engineer here; I love this kind of stuff and I frequently wonder how I might apply my software expertise to that domain again. Amongst other things I worked in automotive and the components I worked on were forged and heat treated high strength steels. The defects in forged components are often very small (tens of microns) but I'd be curious if this could work there. We used powerf…
for forged parts, magnetic particle deposit might enhance defect under UV light. Here [0] is a crankshaft inspection method that mixed UV light with SSD detection.
[0] https://doi.org/10.1007/s00170-020-06467-4