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Offline Ralph Mignano

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  • Posts: 36
Dust extraction help
« on: June 02, 2017, 05:03 PM »
Hi all

I getting a bit confused as I'm setting up the dust extraction in my work shop but having terrible suction. I think I know the problem so looking for some advice to resolve the issue. I have a 3kw twin bag extraction unit which is reduced from 100 to 50mm pipes. Then to festool extraction hose to my tools. But the suction is poor so would presume this is due the reducing of the pipes. Does anyone have a solution without ripping out the 50mm pipes.

All help and advice is gratefully received
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Offline antss

  • Posts: 1453
Re: Dust extraction help
« Reply #1 on: June 02, 2017, 07:25 PM »
You can try opening up more outlets , but your real problem is that type of dust collector isn't suited for 50mm hose/pipe.

You're starving/choking it.
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Offline kevinculle

  • Posts: 480
Re: Dust extraction help
« Reply #2 on: June 02, 2017, 09:07 PM »
A dust collector of this capacity would typically be used in a multi-machine setup with 6" (150mm) main runs and 4" 100mm branches...your plumbing is likely starving the turbine.
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Offline andygiddings

  • Posts: 22
Re: Dust extraction help
« Reply #3 on: June 03, 2017, 12:02 AM »
+1 on Kevin's comments - have a look at Bill Pentz' website and run some numbers through his spreadsheet to find the optimal duct design that you can afford and/or have the space for. Even a long run of 4 inch hose or duct is going to reduce the flow significantly. Typically for a dust collector of this size try and keep a solid and smooth duct of 6-7 inches diameter from the collector to the machine (or as near as possible) before reducing or switching to hose. Also, if you are plumbing in multiple machines, might be a good idea to put some blast gates in.
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Offline online421

  • Posts: 150
Re: Dust extraction help
« Reply #4 on: June 05, 2017, 03:59 PM »
the ducting diameter is too small. 50mm is too small to extract anything efficiently.

For the type of extractor you have, keep it as close to the machine as possible and use the largest ducting you can find.
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Offline Svar

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Re: Dust extraction help
« Reply #5 on: June 05, 2017, 06:43 PM »
Stationary dust extractors are high volume (CPM) and low static pressure. Shop (and house) vacuums are the opposite, i.e. low volume and high static pressure. Only shop vacuums will work well with narrow hoses. Your 50mm pipes are too small, but your festool extraction hose is what kills suction the most.
« Last Edit: June 05, 2017, 06:50 PM by Svar »
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