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Forum topic by MiniMe | posted 01-18-2020 08:08 PM | 1249 views | 0 times favorited | 10 replies | ![]() |
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01-18-2020 08:08 PM |
The logic tells me that the outgoing hose should suck air from the middle of the vortex AND it should do it as high as possible since the dust and chips in the vortex have a descending trajectory These systems seem to contradict my theory. Why? Th Lee Valley system sucks from the central point of the lid (vertical axis of the barrel) Then there is the side option: and then there is the very engineered Thien baffle thart also takes the air from the middle |
10 replies so far
#1 posted 01-18-2020 08:24 PM |
On my Veritas the inlet is the centre, works fine, I do have a partial baffle below the outlet. -- Lifting one end of the plank. |
#2 posted 01-18-2020 09:59 PM |
The dust goes in the side, and starts spinning. Centrifugal force causes the dust to be pushed to the side where it falls to the bottom. The air continues its trip (without dust) out the middle. |
#3 posted 01-18-2020 10:35 PM |
Already drilled my holes in the lid |
#4 posted 01-18-2020 11:09 PM |
FORUMS: From the legend’s very own website. You’ve got several days worth of reading ahead of you. -- ~Walker |
#5 posted 01-19-2020 12:20 AM |
I said PASS to that…I can live with some dust in the dust bag of my DC I did find the website a while ago |
#6 posted 01-19-2020 12:39 AM |
I only said pass because I got a super deputy. I did have a Thien before I got a DC. A separator makes life so much better. Less dumping and at least seems like less dust in the air. I also added a can filter off the outlet. From what I’ve read, those lid separators are only ok. A Thien or cyclone drops more dust and chips before your outlet. I’ve used both, but not the lid, so only speaking from what I’ve read. |
#7 posted 01-19-2020 01:42 AM |
The Thien baffle really isn’t that expensive, difficult, or time consuming to build. Regardless, you asked about the science involved. The folks on the Thien forum have broken down every aspect of the build including placement/size of the intake and outtake ports, thickness of the baffle, width of the drop slot, depth of the chamber, you name it. They’ve tested, analyzed, posted results, adjusted and re-tested. If it’s a science question you have, the answer is there. I know it’s a lot to look through over there, here is one thread that has a lot of good data: -- ~Walker |
#8 posted 01-19-2020 04:28 AM |
One more way to do it |
#9 posted 01-19-2020 03:09 PM |
Ok, some simple rules of thumb here. 1. You want the airflow to induce a cyclone in the container. The spinning airflow carries the particulates (chips, dust, etc) to the wall of the container where they start to drop out due to friction with the wall (on both the particulates and the airflow). Most of the separators above are some version of the cyclone which use elbows, air ramps, etc to get the incoming airflow moving toward the wall of the container to help induce the cyclonic motion. Best exhaust point is from the center as that is naturally the slowest (less particulate laden) air to pull from. Everything else (and I mean that pretty literally) is a design choice impacting how efficient the separation. Round cyclones, conical, exhaust above or below the intake, etc all just contribute to exactly how much of the smaller particles get recirculated. -- No honey, that's not new, I've had that forever...... |
#10 posted 01-19-2020 04:47 PM |
If I use an 90D elbow, can I count on the fact that after one complete rotation the particles will be on a lower spiral already and they won’t hit the back of the elbow creating disturbances in the air flow and reaching the exhaust instead of heading down toward the bottom of the barrel? If I use a 45D elbow I am afraid that the air could be directed toward the bottom of the barrel and stir up the alrea |
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