Thien Dust Separator - Tablesaw Test




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Did this video help you?

proculap montana: how high is that plastic tube? 14"?

freshpootube: That 90 degree bend for the inlet seems to work great. Lots of other versions, people go to great lengths to create a curved angled inlet on the outside of the cylinder. This shows it may not be necessary?

John Delaney: Nice video! That pretty much clears it up for me! LOL! Seriously, I think this is the way to go. 

johnisnot: Note that you aren't seeing *air* going down into the slot, just debris... The bulk flow of the air is all above the plate, with mixing at the slot due to turbulence.

johnisnot: Google "thien separator". The incomplete slot around the outside is part of the design. I haven't tested it myself, but the idea is that the plate decouples the airflow above and below, preventing the collected debris from being picked up again.

Gid joiner: Hi, finally found a container suitable to make one of these, experimenting a bit for now but cobbled together a quick version of yours this Sunday afternoon & i was very surprised at how good it worked, Thanks seeing your see-through version has inspired me to build one in the first place & now I'll take it further, :-) ps I've put a crappy vid on my channel to show :-)

johnisnot: I'm *very* sure you don't want the outlet below the plate. The idea is that the area down below has low air velocity, so that lighter particles stay put. This is just a simple cyclone separator, except instead of a long cone to separate the collection barrel from the moving air, it just has a flat plate. The physics are pretty well worked out, and the air basically spirals toward the central outlet like a whirlpool in a bathtub. You can visualize it when long (eg. handplane) shavings get in.

Nick Bowlby: Does it seem to work better than deeper, conical versions?

rcdc128: I was waiting for a finger to funnel itself through there XD

ghostses: Hello sir, I was managing some of my videos and this one popped up on the side panel. I too have made one of these and posted a series on building it. I've looked at your link to the build and see you made a comment on things you don't like- but all things taken into consideration, this is such a great and simple build I just had to post- which I rarely do. A side inlet may help the hassle- but as to what I see on your video- both designs work equally well. Great work and thanks for sharing, G.

Krešimir Cindrić: I knew how they work, but I've never seen a transparent one. Very interesting! :D Thanks for sharing!

johnisnot: I don't know. I haven't compared, and the answer depends on your criteria. For particles as big or larger than fairly fine sawdust, I don't think there's anything better because I've seen zero of that stuff get through. For very fine dust, some other cyclone design might be better, but I don't think any cyclone is good enough to capture the really tiny particles that are hazardous from a health perspective.

elsoclan: That is so illustrative with the clear plexi! I've been reading a bit of dust extraction principles, but this lets you really see it in action. Will be building one of these, maybe for and update into my current vacuumcleaner powered cyclone- metal bucket-drag-around-version!

johnisnot: I did try installing another baffle, held up on the all-thread, mounted just below the inlet elbow. I was interested in seeing what was happening above and below the plate, and thought maybe it would provide even better isolation between the upper airflow and the collection can. Bottom line is it worked better without that plate, and I think a little distance is a good thing - it just makes the unit a little taller.

paralogos: Ok, thanks for explanation.

Gid joiner: Hi do you think this would work ok with thicker material from a thicknesser,like small shavings, would the slot to the collection area be big enough? all the demonstrations concentrate on finer dusty particles. Prob gonna try building one anyway but as you already have a clear one it'd nice to know Thanks.

johnisnot: Well, a mixture of air molecules and tiny wood bits comes out the end of that bent pipe on the left at about 2.5 meters / sec. Those particles want to keep going straight (Newton's 1st) but we get a separation effect because the mixture hits the curved plastic surface and the air is deflected more easily than the wood particles.

Gid joiner: Thanks

johnisnot: It's just a flat piece of 1/16" thick polycarbonate, about 9 inches x 40 inches, rolled into a short tube. It's very flexible.

Dave Smith: Thanks for the vid. You've just given me the confidence to build one myself. I couldnt work out how I was going to do the cone part and now I find that it's not necessary at all :-)

DistrictWoodworking: Great job, How did you get the plastic from a sheet to be a circle?

jsteifel: Whats the name of the second 2 motor extractor?

johnisnot: It works great with my "lunchbox" style thickness planer. I even vacuum up handplane shavings with it when I clean the shop. Sometimes a long wispy shaving will get tangled around one of the threaded rods that holds it together, but it has no problem separating larger material from the airflow. Using the planer, I actually filled up the collection barrel, and half filled the top separator, and still nothing went through.

John F. Bramfeld: I suspect you are right, but it still nags at me that yours and other visualizations show at least some air doing down into the collector box. That air has to come a back up. As typically constructed, there is nowhere to come back up but through the slit in the outside of the plate, which in turn may disrupt the air going down to some extent. Being pretty sure and being sure based on actual observation are two different things. Think about being the first to demonstrate the return path.

John F. Bramfeld: Great job. I am preparing to make a rudimentary add-on to my shopvac and I am having trouble conceptualizing the part you can't see in this type of demonstration; the path the air takes back to the outlet. It's not clear to me, for instance, that the return pipe shouldn't draw from below the Thien sparator rather than from above. I wonder if you ran smoke through the system instead of dust you could actually see the route the air takes after the wood particles have dropped?

Five Minutes On The Water - And other stufff!!!: I was wondering if you had done any experiments with the spacing between the collector cover and the baffle. I've notice Thein and several others have the cover and baffle much closer together than your design. If you have was there any difference in fine particulate efficiency?

Sirus: Thanks for the upload. seems to catch just as good as the cyclone shape ones. Nobody is going to win on the fine fine dust, so lets all give up and have a fine filter for that. I was thinking, seeing these are based on velocity and vacuum and gravity. Gravity seems to work on this fine. what would happen if you had the vacuum end a bit higher and just behind the input pointing opposite to the debris end with a slight tilt to aid gravity. Faster spin perhaps but less center vacuum.

paralogos: I can`t understand the physics.
Rating:
Thien Dust Separator - tablesaw test 4.7 out of 5

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proculap montana: how high is that plastic tube? 14"?
Repp Kornegay: comment AHA,MUITO BOM HA LOL AL testing 7
mrcubcadet: Cool, that is rare to have a rear pto, sometime you should take a video of the pto running but if you do that why don't you get better lighting, lol, any way nice old cub
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Thien Dust Separator - tablesaw test