Dust Extraction

Well, after seeing the EOFY sales brochures, I thought it about time I upgraded my workzone portable wet/dry shop vac to something of more note. Bobl you'll be please to note that I have since invested in the Scheppach HD12 - Dust collector - LPHV - 680CFM - 75ltr, and considering I only have 1 tool to hook it up to at this stage, I think it will be perfect. The workzone just wasn't cutting it, despite the number of pvc reducers I used in reverse to get a bigger diameter suction hole.

I purchased said item from Machinery House for $198 ($44 off), and when you consider my wife's V6 Dyson stick vac cost double that and I have to empty it after 5-10min (if the battery lasts that long), its a steal. I also bought a hose kit at $89.00 which consists of 2x3m lengths of 100mm hose,10 hose clips + various gates and connectors etc.

Here's the link if anyone is interested, sale ends Sunday. (no affiliation, other than being a Machinery house Mate (club member)) and the lover of bargains.

https://www.machineryhouse.com.au/Se...ractors&page=1

Now all I have to do is buy a house so i can convert the double garage into a workshop. then I can build a shelter to house the extractor, run the PVC piping all around the shop and i'll be set.

Richard

Sorry to say but that dust extractor is not suitable to be connected to any kind of a ducted system. :no: To have any hope of achieving anything you will need to keep it as close to the machine it's connected to with the shortest run of pipework possible. Even then you can forget about achieving a flow rate anywhere near 680cfm. You may well be better off putting a small cyclone ahead of your shop vac. :C

Oh well, we'll see.

I agree with Aldav, these 1HP DCs should not be called dust collectors but "wood chip collectors" as that is mostly what they collect .

The 680 CFM manufacturers claim is performed using a flawed testing it's for just the impeller alone. By the time filters, hoses, and machines are added, the best that can be expected is around half this flow rate. None of the 1HP DCs I have measure in real operations using 4" flex have produce more than 320 CFM.

If all you want to collect are the chips then 320 CFM will be fine but it otherwise it simply won't collect enough fine dust to keep operators safe.

If you are an intermittent operator and your budget doesn't stretch any further then, depending Ion the size of your shed in addition I would recommend using a couple of bathrooms fans to provide ventilation of the fine dust from your shed and a mask for when making lots of fine dust. This is still not a real solution compared to a real 1000 CFM DC but it will be better than nothing.

Bob, it's not even 1hp, 3/4, 560 watts. :C If I were you Fumbler I'd be tempted to try and move this on and look out for a second hand generic 2hp, or save up for a new one, you might even be able to get a used one for around what you paid for the DC12.

Gents, thanks for the bad news but as I said I only have one machine for it at the moment so I will give it a go. If it doesn't do as I expect or as it says, then I will have grounds for return. I will then put that towards a bigger CFM machine. I don't do a lot, and my work space is open enough to begin with, ie it's almost an enclosed carport. Walls 2 sides, roof, garage door with diagonal boarding with 1" gaps between boards and open the opposite end with a cafe blind to prevent rain. This was primarily for chip collection, yet no extractor I have worked with even in workshops manages to capture the bulk of the waste, if it draws the bulk of the sanding dust away then I'll be ok, if it doesn't then I'll just have to cough up, pardon the pun, on a bigger unit.

i appreciate the voices of concern however.

I finally hooked it all up, and although they said it would work, I'm happy to say that it does and sufficiently for what I had hoped for.

i made a frame thats bolted to the back of the lathe and a billy cart axle as the slide rod. Hopefully you can make it all out from the pics. I didn't expect it to collect all chaff coming off through the roughing stage I haven't know an extraction system that can. Anyway, whether it be wood or Acrylic, it draws enough away that I am happy. With all the points made from the others I was nervous, but to my suprise, it works better than expected. I understand the downside for getting such s small system so my hose kit will go into storage til I get a you beaut 3hp system. I turned the Acrylic blank in the picture and as it got rounder and the streams started flowing off it was actually quite spectacular to watch the strand peeling off the blank straight down the guts of the extractor in one long stream, helping not wind up around the job. I will get the wife to take a photo of it as it peels off.

again thank you to all the advice given above.

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Originally Posted by Fumbler

I finally hooked it all up, and although they said it would work, I'm happy to say that it does and sufficiently for what I had hoped for.

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Good to hear you are happy with it but turning Acrylic or most plastics is not really a good test for an extractor because the material will comes off as strings even if a less than sharp chisel is used.

I don't believe anyone said your setup would not collect the visible chips/strings which is the size of dust that doesn't cause health effects. What can't be seen is the <1% of the dust which is invisible/super fine dust that is most likely to cause long term health problems. You will get an indication of this after a few months use when a thin fine layer of dust starts to accumulate around the rest of the shed.

BTW, for fine dust collection a more efficient hood than the one you are using is a Bell Mouth Hood.
These things are sold as "speaker cabinet ports" or "Bass reflex ports"
eg PORT11010 Bass Reflex Port 100Mm, Audio Speakers | Wagner Online Electronic Stores
They are available for half the price shown on that link if you shop around.
Visibly there will be little or even no difference to your existing hood but it will collect a bit more fine dust. After that the 4" flex and 4" port on the DC are the bottle necks to fine dust collection and until 6" ducting and DC mod are exploited there won't be much of a gain in fine dust collection.