Litres of dust

Picked up the cyclone separator from Hare & Forbes as Phil suggested (thanks again for letting me know about it!)

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It is quite reasonable quality – I’m happy with it. Has a window to sight when the bag is full, and it can take a plastic bag as well.  You would normally expect the bag would be sucked up into the cyclone, but there is a secondary hose to the base of the collection bin, so some of the suction pulls a vacuum under the bag and holds it in place, until the weight of dust can take over.  This doesn’t cause any loss in power – once the bag is sucked down no further air will leak past so this doesn’t sacrifice any performance.

So working from the dust extractor out.

The extractor inlet is 8″.  This is pretty phenomenal, and at full power can really suck your hand against the grate.

I have sourced an 8″ to 2x 6″ Y piece, but not from your normal expected suppliers.  I couldn’t find anything 8″ from the normal woodworking suppliers, but found a hydroponics supplier in NSW that had exactly what I wanted, and at a really good price.  For $30 (+$12 delivery), I got a galv metal Y piece.

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The equivalent from one of the woodworking suppliers has a 200mm (8″) to 2x 5″, for $110.

Y

 

The outlet for the cyclone is 180mm, so close enough to 8″.  It comes with a reducer to 6″.  I haven’t been able to find any 8″ hose, so am contemplating running dual 6″ from the cyclone to the extractor.  Either that, or I have a spare 6″ inlet for the extractor going to waste.

Until I get the 6″ pipe, I am currently running dual 4″ from the cyclone to the extractor, via a Y piece at either end.

The inlet to the cyclone is 6″, and it comes with a 6″ to 2x 4″ Y piece.  I have currently connected it to my 4″ pipe run, so performance is down at every transition.  (Effectively I have reduced the 8″ inlet for the extractor all the way down to 1x 4″, so not ideal!)

Fired it up, and fine dust does manage to get through to the filter bags, but I don’t have a problem with that – the cyclone is there for bulk material separation in this case.  The smaller cyclones I use separate everything, and even fine dust doesn’t get through, but this is not a cyclone for that purpose.

In saying that, I sucked up about 100L of sawdust, primarily MDF, and about 500ml managed to find its way into the collection bags of the dust extractor.  It is much easier to empty the bin of the cyclone than remove the bags from the extractor, so this will make a lot of difference.

I am still contemplating where the extractor and cyclone will sit – it might need another small (and tall) external enclosure – will give that more thought.

Compare the cost of this setup though, to a dedicated cyclone extractor.  That has 2200cfm through 3x 4″ inlets, and costs $3300.  I don’t know what flowrate I am getting through the cyclone, how much it is reduced from the 2900cfm of the extractor, but total cost: $1285.

I still want to boost the overall performance, and either 8″ to the cyclone or 2x 6″ will help, but no matter what, you can only suck so much through a 4″ pipe that connects to the machine.

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