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27th July 2020, 09:51 PM #16Senior Member
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125 mm. Some DCs use 150 mm for that connection. In that case I would expect the 2" loss you see at 600 CFM to become about 0.8". With a collector ring modified to directly accept the rectangular fan out let the whole 2" should go away plus maybe a little bit for the ring itself.
If you like to think in terms of equivalent pipe length then 1" at 600 CFM is about the same loss you get with 15 m of 150 mm PVC.Dave
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27th July 2020, 10:34 PM #17Woodworking mechanic
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Thanks. Is the 2” loss at 600 you are talking about between pics 1 and 3?
My impellor outlet is modified to 150mm as is the entrance pipe to the collector ring. The original 125mm inlet to the collector is now utilised as an outlet and goes to a Thien unit in a 200litre drum. I had to do that because the single pleated filter outlet was insufficient for the 150mm modified system.
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27th July 2020, 11:08 PM #18Senior Member
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28th July 2020, 12:12 AM #19Senior Member
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28th July 2020, 12:19 AM #20Senior Member
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28th July 2020, 12:46 AM #21Senior Member
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It's not hard to get rid of it. With the cyclone in the system it only functions as a bag holder. If you're venting outside there's no need for the bag so no need for a holder. Venting inside preferably uses a pleated filter and you can then just feed the filter canister directly, no need to spin the air again just to send it out.
Dave
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28th July 2020, 12:58 AM #22Senior Member
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28th July 2020, 02:11 AM #23Senior Member
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28th July 2020, 04:12 PM #24GOLD MEMBER
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so out of pure curiosity which is the more efficient system (or the lesser of two evils)
1.
modified 2 or 3 hp dusty
inline cyclone
no plastic/filter bags or separators
vented straight outside with an adapter from DC outlet through a wall
2.
modified 2 or 3 HP dusty
no cyclone
plastic collector bags, and pleated filters
enclosed and vented outside
basically does having a cyclone but nothing on the tail end of the DC provide better CFM then the separators and filters?
can only assume going off a lot of Bobs advice that #2 will actually provide the best benefit in terms of air movement.
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28th July 2020, 04:21 PM #25
Either COULD be the more efficient. It would depend a lot on any number of design factors and equipment options. Not all dc's and cyclones are equal.
The real question is which is better for you. In either of those options you are exhausting all your heated or cooled air from your shed anyway. If you are going to use pleated filters you might as well make them good ones vent back into the shed to save heating/cooling energy.
I hate plastic bags and filters and use my dust producing machines in the un-airconditioned compartment of the shed so i go with option 1. I empty a bin when needed and don't need to clean filters.
If you love cleaning filters and dealing with dust bags go with option 2.I got sick of sitting around doing nothing - so I took up meditation.
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28th July 2020, 05:07 PM #26Woodworking mechanic
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Just decided to measure my system. It’s described in Post #17.
The system measured is basically 6 metres of 150mm PVC pipe and 3 metres of Flexi going to a table saw.
All hooked up - 620.4 cfm
Thein filter hose disconnected - 649.8 cfm so it’s pipe is pumping straight to the air.
Outlet pipe from the impellor disconnected from separator ring and pleated filter so pumping straight to air. - 720.9 cfmLast edited by Lappa; 28th July 2020 at 05:15 PM. Reason: Better described thin filter connection
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28th July 2020, 05:17 PM #27Senior Member
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As I'm currently redoing my own extractor system, I'd like to know whether my attempts are achieving anything. To that end, can I ask how people are measuring their airflow?
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28th July 2020, 05:21 PM #28Woodworking mechanic
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I have a hot wire anemometer . I also have a calibrated pitot tube used with an electronic “manometer”.
I prefer the anemometer as it talks to my iPad so I can capture and store readings.
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28th July 2020, 05:33 PM #29Senior Member
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28th July 2020, 05:42 PM #30Woodworking mechanic
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Where abouts in NSW are you?
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