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Thread: Dust extraction
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12th September 2013, 06:15 PM #1
Dust extraction
AT the moment I am using a H&F HD12 Dust Extractor. I have linked up a metal lathe and a wood lathe to it through a Y join with drops gates to change between machines. It is extracted to another shed outside to prevent dust re-entering. It seems to me this machine is not powerful enough for both machines (although they only operate one at a time). It works ok for a while when I swap over the filters but has reduced its operation a lot lately. The ducting pipes are not clogged up as I have checked them.
I have also this week installed a Microclene filter in the main shed which can turn over the cubic meters inside the shed at about double the advertised rate due to the size of the shed. I think it does 64cm x 10 times an hour. My shed is only 34cm so it is overpowered for the shed, but nothing wrong with that.
Obviously I need a more powerful DE. Can anyone suggest an upgraded model. Please bear in mind that to get it into the DE shed, it cannot be too much bigger in dimensions to the HD12 in terms of height.
Your advice appreciated.
Greg
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12th September 2013, 06:31 PM #2.
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HD12 with 4" ducting will draw about 350 cfm with a clean filter and a tail breeze.
The figure of merit is a true 1000 cfm at source, you won't get this with anything less than a 3HP motor and a 13" impeller and shortish lengths of 6" diam ducting.
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12th September 2013, 06:36 PM #3
Thanks Bob
But what sort of machine am I looking at and importantly how noisy will it be as I have to consider the neighbours at the back. I have already lined the DE shed with sound proofing.
Would a H&F DC-7 - Dust Collector (240V) 2300 CFM - LPHV System - 3hp do the job or not
Greg
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12th September 2013, 07:59 PM #4.
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12th September 2013, 08:10 PM #5
I would strongly suggest you DO NOT connect your metal lathe to the DC system, unless you intend to turn ONLY wood on it.
Neil____________________________________________Every day presents an opportunity to learn something new
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12th September 2013, 10:05 PM #6.
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The main reasons I would not not connect a DC to a MW lathe are, in decreasing order
- the cooling and lube oil mists associated with metal turning will clog the filters very quickly
- the swarf will cut holes in the filters and let the wood dust out
- the swarf will embed itself in the filters and make it a PITA to clean
- the likelihood of a hot piece of swarf starting a fire in the filters or bags.
The latter three can be eliminated by using a dedicated swarf/metal chip catcher - any large metal container will work just fine.
This is all that is used in the H&F MW dust collector but I would not use the same chip collector for WW.
I ran an upside down Makita belt sander attached to the same DC I used for WW for many years. The belt sander was connected via a 2" diam 3m long transparent hose to 4" PVC ducting and I used the sander often with ferrous material.
The sometimes shower of sparks that would come off the belt would not get past the belt sander before being extinguished - at night I could check visually if any sparks got any further but I never saw one get past the sander.
Over time the hose would fill with metal dust and had to be emptied because it killed the flow.
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