Dust extractor advice required

[Madeye]

As a newbie to the forum I hope I'm posting this in the correct place.

I'm looking for advice as to the most appropriate dust extractor to purchase. It will be used to extract from a startrite table saw & bandsaw along with a hp/t. Two particular models that I'm considering are the rojek R2002 and the MetaboClean20, does anybody have experience of either of these.

I would also appreciate advice on ducting. The above use either 150mm or 180mm ducting, I know the likes of Axminster can supply 100mm ducting, but are there many sources of the larger diameters available.

The extractor will be housed in garage which is seperated from the workshop by a stud partion wall and therefore fine extraction is not critical.

Hopefully I've not repeated two many previously answered questions.

Regards,
Geoff.

 

[bob321]

make your own cyclonic dust extractor and 2 old garden leaf blowers

 

[OLD]

This was CCL http://www.lindab.co.uk/frameset/ru...s/a_masterweb_standard.asp&T=43&ExpandID=2762
They have all the duct sizes blast gates etc.
My workshop with extractor on the other side of the wall works quite well with a 1hp SIP extractor with ordinary bags ( max suck ) and 100mm duct .So you may be able to save money.

 

[Madeye]

OLD,

Thanks for the link, they certainly seem useful

What's the longest run on your ducting ? I'm looking at having about 8m horizontally and about 5-6m vertically to reach the p/t so I a little concerned I'll loose some of the suction. I'd be interested to know if there's any data available concerning the effect of distance, no. of joints, etc on performance.

Regards

Geoff.

 

[JonnyD]

I have about a 15m run of 150mm steel spiralbound ducting going to my extractor a Felder AF22 and have no problems with suction when used with blast gates and a clean filter. I got my ducting from a local metalwork shop who ordered it in for me in 3m lengths for about £18 and bends for about £8 Tee pieces and branches were more expensive.

There is loads of useful info here on setting up a ducted system

http://billpentz.com/woodworking/cyclone/index.cfm

and you can get the ducting quite cheap here

http://www.ductstore.co.uk/index.html

Jon

 

[OLD]

To compleat the picture i have 4.3m of rising/horizontal steel duct with a total of 3.2m flexible duct on each end total lift is 2.0m over all.
Keeping the lift as low as possible should save on HP also the elimination of leaks.

 

[Madeye]

Thanks for the responses. Just a quick read of the cyclone doc is causing a rethink of how I route the ducting. I guess I'll be spending the weekend in the workshop figuring out where to put things (temperature permitting, as it's currently unheated :shock: )

 

[BMac]

Could someone point me in the right direction to see or get plans for the dust collector using a cyclone and leaf blowers please?

I have seen this suggestion on other forums but I simply cannot find any information about it - all the links I try are dead and Google searches don't throw up anything about it.

I would be extremely grateful for any help.

Thanks.

 

[neilyweely]

Yeah, me too. I have a garden vac thingy I could use. Where do I find out how?

TIA

Neil

 

[ProShop]

I'm not sure the Rojeck is powerful enough ie, moving enough air for what you describe. One of the problems with these types of extractor is that as the sacks fill, the suction drops, and as the cloth filters clog up over time this coupled with the above can have a dramatic effect on the suction. So you really nee something with a better rate to start with.

I notice the filtration of the machine is not that good either, there will be more dust outside the machine than inside after a while :roll: .

The machines you have should have the extraction rate required somewhere in the manuals, you can then use this info to get the right machine that will deliver the suction you require.

Another thing to look out for is the static pressure requirement (measured in Pa now) at the extraction hood of the woodworking machine (should be in the manual as well).

Also try to avoid T junctions in the ducting and sharp short 90% bends as these also slow down the extraction rate quite a bit.

Keep the 150mm or so ducting from the extractor running all the way to the woodworking machine as far as you can, ie to the blast gate which connect to the flexi hose onto the woodworking machine.


Hope this helps

 

[CNC Paul]

To compleat the picture i have 4.3m of rising/horizontal steel duct with a total of 3.2m flexible duct on each end total lift is 2.0m over all.
Keeping the lift as low as possible should save on HP also the elimination of leaks.

Try to reduce the amount of flexible duct as it reduces efficiency and air flow.


Paul

 

[bob321]

this is the layout 2 blowers one main and one extra for more suction

MCU means motor control unit
all parts are available quite easily


bob321 8)

 

[BMac]

Thank you Bob,

That is refreshingly straightforward because I have read so much stuff about dust extraction I have made the issue far more complicated than it need be.

Brendan

 

[bob321]

the main motor will be the bigger one and the second one just slightly smaller or the same size

:!::!:if the exaust is going to be re-circulated in the room i would put a filter on it or just cut a hole in the wall and vent it outside:!::!:

put the MCU in a handy place or you could modify it to have a remote switch with a relay

bob321 8)

 

[BMac]

Bob,

I'm going to exhaust through car air filters rather than dump warm air outside. However, I intend to exhaust through the wall to outside in summer and I'm going to use a filter there too because I don't want the Green Police getting me. I was told it was perfectly fine to leave your workshop doors open to allow dust out but if you pump dust laden air outside you are deemed to be adding pollutants to the atmosphere.

I've got children, I don't need any more hassle.

Brendan

 

[bob321]

this is my cyclonic extractor i the next few weeks i am going to make it a mor permanent job

this was made 4 under a fiver coz i had all the parts except the black bucket

this is what i use with the above

this is what i had in about half a year and it will handle all this at once

this is the MCU being made from scraps of chipboard, MDF and hardboard there was no real measurements all what the size of the wood would give

bob321 8)

 

[BMac]

Thanks again Bob.

Brendan