What is the best extractor for 63mm piping, as thats what i have in my workshop,but my floor standing extractor cant handle the chips as its leaves the out let , so block it. many thanks
I would recommend a book "Workshop dust control" by Sandor Nagyszalanczy. Its an american book but explains the two different types of dust extraction. It`s well worth a read even showing how to build some commercially available products.
As for a shop vac i have a Delta & a Camvac both are very good, the latter gives better filtration, but cost twice the price.
If as i assume you want a high pressure low volume system then an extractor with a 100mm outlet reduced down to 63mm would increase the pressure further, & should give good service.
But before you upgrade your rexon i would recommend researching more.
I don't want to be picky, and particularly as this is your area of expertise.....but surely if you decrease the diameter of the tube you actually increase the flow-rate......not the pressure? In fact, from memory of physics lessons way-back-when......the pressure will actually drop, methinks.
The point about the thicknesser is you need low pressure high volume extraction from that. Not high pressure low volume that you get from a shop vac, it`s all in the book.
I`m not an expert (by any means) & there is so much information on the subject, you can end up wasting money & still not have the system you need.
As i have said already do your research, if not the book i said, then other sources of info, research cost little extractors a lot.
No, I'm sure I am right. Pressure is inversely proportional to speed, and reducing the volume increases the speed of the airflow thus decreasing the pressure. It is counter-intuitive, but it is also the principle behind aerofoils and keeping Jumbo jets in the air.
The aerofoil makes the journey of the air over the wing longer than the journey under the wing, so the air above the wing increases in speed.......and thus decreases in pressure...... "sucking" the wing upwards.
Science was actually my worst subject at school, so I'm in no position to offer any advice here, sorry Mike. What I do know though, is that if a HVLP extractor has a 100mm hose, it is reccomended that you do not restrict it to less than 75mm, I believe? I think that's what Axminster say, although I've seen other sites quote 50mm...
If this Rexon-model is a twin-bag type (quiet-running, with the filter above the collection bag) then that is a High Volume Low Pressure extractor; which is just what you want for chippings and shavings.
Fine dust from saws - in particular, MDF dust - generally requires a HPLV extractor, which is generally a lot noiser and sounds/looks more like a vacuum. Saying that though, you can get way with using a twin-bag-type on a table saw or bandsaw, when you're cutting soft or hardwoods. But for MDF, you really want something with a filter rated at 0.5microns.
James, if you look at my workshop pics you'll see it is piped with the 63mm system. I use the Axminster WV100 extractor hung on the other side of the back wall of the shed. It is noisy and dusty so putting it in a seperate outhouse works for me. I also use that space as a timber store. I use the 63mm piped system for anything that makes dust but I use a 4" hose directly to the planer/thicknesser. The chippings from that would block the system a bit. I just pull 1 type of hose out (where the extractor enters the shed) and push the other in. Underneath this point is a remote controlled socket switch from Maplin which means I can turn the extractor on from anywhere in the workshop. £14 well spent. My system is ok but still only pays lip service to dust extraction. After using a router, the mitre saw or table saw a few times even with extraction, the dust starts building up. If I had the money I would have an American cyclone like the Oneida Dust Gorilla, moving a large amount of air (and therefore dust) piped through 6" metal pipe reducing to 4" only at the machine entry point. Only this sort of committment seems to really give a completely clean environment.
ok lads ive got it all on board, i think for pipework u would need a high vol air flow , pipework will reduce the air flow alot , the rexon is ok, but the machine i need need's to double that flow about 2000 !, axminster have one at about £200, but ill contact them and find out if it will cover the pipework.
the rexon hooked up to the 63mm pipework is like,,,hmmm say a hoover with a blocked filter, not alot of puff, take away the pipework, and it will work well, its the pipe work lads, the longer the pipework the more power u loose, but will let you all no when i hear back from axmin !
Could you post a photo of what you have at the minute, showing the pipework. I have rigid pipes running 5m & don`t have a much loss of suction, if i was to do the same in flexible i imagine i would run into the same problem as you are.
As i said in a previous post about Mike`s extractor flexible pipe should be kept to a minimum. If you watch flexible hose when you switch on your extractor it concertina's up & doesn`t relax until you switch it off, that is all the suction being lost just pulling the pipe together.
It doesn`t matter what extractor you get poor duct work will give poor performance.
You could also install a blast gate at each machine point, if you intend to do it that way. You can buy them, or I think some people have made their own from scraps of ply, etc. They basically allow you to close off the airflow to all other machines so that it is all focused on the one you want to use, which is left open.
I have to stop you before you go too far with this text-speak! Some of these posts are difficult enough to understand already without them being written in an alternative language......so could we give English a try?
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What I do know though, is that if a HVLP extractor has a 100mm hose, it is reccomended that you do not restrict it to less than 75mm, I believe? I think that's what Axminster say, although I've seen other sites quote 50mm...
baz how do i get my pic's on this ?, im new here,
