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When I was designing the downdraft for my plasma cutter I was concerned that it might eject too much metal dust out of my shop and into my driveway. It turns out that I was right and as I've been cutting more I've noticed a real uptick in accumulated metal on the ground. To address this problem I built a filtering system designed to remove the bigger particles from the exhaust. Since I'm not concerned with smoke and really extremely fine vapor I was able to make a "solid state" filter that takes advantage of the inability of a heavy particle to follow a tight corner. It was inspired by cyclonic seperators on larger shop vacuum systems. From the testing that I've done it seems to work quite well and I'm pretty happy with the results.
These videos usually take a ton of work and a lot of money in tools and materials. I've made a patreon if you're interested in supporting the creation of these projects: www.patreon.com/stuffmadehere
Here's some of the tools that I use in this video:
Hypertherm powermax 45xp with machine torch: amzn.to/2zfoyAv
Hypertherm fine cut consumables (great for sheet metal) amzn.to/34SjMom
100mm linear stage for plasma Z axis - easier than building: amzn.to/3cAeEb3
Anemometer - cheap but seems to work well: amzn.to/2ROtkeL
Downdraft fans - these things chooch!: amzn.to/2VKFbM5
The best marker ever. Always in my pocket: amzn.to/3ewHGtL
Cyclonic dust collector: amzn.to/3ezyghf
Views : 2,352,674
Genre: Science & Technology
Date of upload: Mar 8, 2020 ^^
Rating : 4.942 (880/59,505 LTDR)
RYD date created : 2022-04-09T06:05:31.889266Z
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YouTube Comments - 1,530 Comments
Top Comments of this video!! :3
Nice 'Prototype'! The most dangerous aspect of a prototype, when it works it becomes permanent. I have all kinds of examples of this phenomenon I've built! :-)
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"There's nothing more permanent than a temporary solution"
-AVE
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I love āFortunately we live in the 21st century, and they invented alchemyā
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He sounds like William Osman but makes stuff as well as Adam Savage, it's the best of both worlds.
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With that kind of airflow I'd be tempted to try putting a second layer in, made with smaller diameter tubing to try to catch the smaller particles.
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This is a great video. Iām actually doing a PhD in particle separation. The particle Stokes number is a measurement of how floaty the particles are.; large ones behave like cannonballs , small number indicates snowflakes. Your tiny dust will follow the streamlines of the air very faithfully unless thereās a significant, consistent acceleration. If itās consistent- like the centrifugal acceleration in I the cyclone separator, even the smaller particles (and there will still be lots of very fine particles that are dangerous) will depart the streamlines and go to the walls like you said. I recommend you build your own cyclone separator, you can change the dimensions of it to get ācut diameterā you want. I could send you a book about cyclone separators, except I donāt know how to message people on YouTube and your video is from 3 years ago so you have probably moved on.
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We had a moisture separator in our shop that worked on the same principle as your filter. It worked a lot better when it was rotated 90 degrees so that the particles had to go from down to up instead of side to side.
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Speaking hands like a This Old Tony
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If you ever do need to count the particles (because data <3), we used imageJ to count bacteria back in college.
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I like the apparent nod to This Old Tony with the first bit of this video
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This is an older video and I'm glad he started talking to the camera, and adding "wife-mode" to pretty much everything. He is a fun, nerdy guy, and I'd rather see him do stuff than watch his hands. Definite contender for smartest guy on Youtube. Love to see something between him and StyroPyro. One man's engineering and anothers' chemistry background might be fun.
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"I work with a lot of engineers. I know how to settle this score - data !" LOL
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As an engineer with a LOT of experience & having heard an enormous number of stupid engineer comments.... I would have told your imaginary engineer (you're cutting down the air flow) to pound sand.
BTW if you're aluminum tape stops working or you want to upgrade,
there is a stainless steel version of 'aluminum tape'. Another interesting project.
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Greetings, I know I am a little late to the video, but I am a filter engineer. I have two recommendations.
1) Vane anemometers are notoriously inaccurate, especially a pocket one like that, using a hot wire anemometer would work much better.
2) I would recommend an expanded aluminum, you can find these are ready replacements for a range hood filter, they come in a variety of sizes so you should be able to find one that meets your arrestance & pressure resistance needs. They are normally cleanable, but I am not sure in this case. (Bonus points if you use a pleated design rather than flat sheet form factor).
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Is it a tribute for This Old Tony ? I really appreciate that. True respect!
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When you said we invented alchemy I was expecting some TOT style edit of you turning the PVC pipe into steel
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As an (aerospace) engineer my intuition tells me that your "obstruction" would not have a very significant effect on airflow, at least for your purposes. Obviously something like a 10% reduction isn't enough to explain an 80% reduction in particle ejection except maybe if the particles just aren't moving as fast so they have more time to cool -- making them harder to see. I say intuition though because saying for sure requires math or at the very least a simulation that does it for you.
However, it is important where you hold your flowmeter against the fan. Depending on the geometry of the blades (and this is still usually true), the velocity of the air from the fan will be faster towards the outside rather than the inside. Basically, the velocity diagram across the diameter is more like a V than a flat line. Again, not really that important for your purposes (you were holding it at roughly the same spot), just something to consider.
Cool project.
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I love your content . You have some good mildly dry humor and a good way of explaining what's going on . Not even halfway through the video I subscribed. Great job man š
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I just found your videos and pretty much binge watched them all over two days. I'm an engineer who also likes to invent and make stuff. This video is the last one I viewed and based on what I saw in the others, I was mildly disappointed that you didn't write some code to measure the particle density for each of the tests to do more of a quantitative comparison. ;-)
Speaking of code, you frequently mention that it would be boring to spend any time explaining it and perhaps in in the minority but I'd actually enjoy that.
Oh, and keep including the failures that lead up to your success. That's the best part of you videos.
Lastly, I have to compliment your wife. Her power to put up with you is off the charts and I love the eye rolls that go along with that.
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@ryanm.191
4 years ago
āI know how to settle a score with engineers - dataā How dare you use our weapon against us
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