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15th September 2020, 03:42 PM #1SENIOR MEMBER
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Dust (and noise mitigation) for mixed use shed
Hi all,
I have a CNC router which is a major dust generator. My shed is a double car garage (no car parking allowed, the shed is too valuable to waste on car storage). Small suburban block.
My shed use is more towards CNC machines including a metal lathe and milling machine rather than a full blown wood shop.
I do have a SCMS but use it sparingly and am more than happy to wheel it outside for use.
I don't have a thicknesser or jointer.
So I have one fixed wood dust generator - the CNC router. Footprint for the router is ~150cm wide x ~1m deep.
I have been using a Fein Dustex vac with HEPA filter with a cyclone, but obviously this is wholly inadequate and the shed gets covered in dust whenever I use the CNC router.
I have a ?32amp ?35amp supply to the shed sub-board (different value circuit breakers on each end of the shed supply...)
16amp circuit breaker with 10amp GPOs for the circuit in the shed. Thus I think a 2hp is more realistic than a 3hp DC. I'm also reluctant to give up the greater floor area a 3hp twin bag DC requires.
I am looking at the best options. Ideally I would also like to reduce the noise levels to allow me to use machines a bit later without pissing off the neighbours.
Hours used are relatively low. Anywhere from zero hours in a month to 8 hours over of a couple of days.
I am intending on getting a 2hp generic dust collector and performing the mods as per the sticky.
There is no room for putting DC outside. I would love to, but it's ~70cm to the fence on 2 sides of the shed, ~100cm on the 3rd side (but there is a corridor, bathroom and laundry in the way and thus would be a long duct run around the outside. Also that side has the pickier neighbour with a room right on that boundary) and the 4th side has the shed doors and faces the back deck and does not meet household planning approval...
So DC looks like it will have to be inside.
Options:
1. DC in airtight box next to the CNC router.
Pros
- Simplest solution
- Relatively easy to reduce DC noise
Cons
- Dust that escapes collection at the source will distribute throughout the rest of the shed
- does nothing for the CNC router noise
1a - option 1 + add dust containment curtains / tent around the router
- might cut dust distribution around the rest of the shed?
2. Room within a room - build a small room around CNC router and DC
- really still need DC in an airtight externally vented box within the sub-room
Pros
- Best option for avoiding dust affecting the rest of the shed / metalwork gear
- Some noise mitigation but obviously I need to actually let air into the sub-room for it to be extracted
Cons
- Makes shed less versatile / reconfigurable
Should I forget about trying to combine dust and overall noise mitigation and do some separate noise mitigation for the whole shed?
DC will be ducted to the router cutting bit with minimum of flex duct possible.
Questions:
What option would you recommend?
I'm happy enough to put a hole in the wall and vent the DC box outside. How big a hole do I need?
Are swivel joints readily available and any good?
Do telescopic dust ducts exist or has anyone made one?
(The router travels in an area of 130cmx70cm in XY plane and ~20cm in Z (vertical), so the duct has to accomodate this movements. Flex is obviously the easiest way but often results in excessive lengths of flex duct.)
I would appreciate thoughts and experiences of others.
Attached is a photo of the CNC router / part of the shed. I can easily move the cupboards and put the DC to the left of the router (behind where the computer is sitting).
Shed Dust1.jpg
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15th September 2020, 03:59 PM #2SENIOR MEMBER
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Forgot to mention:
Shed has two roller doors on one wall. No other venting, so there is no cross flow at all in current state.
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15th September 2020, 04:01 PM #3GOLD MEMBER
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The Fein/DD combination should be more than adequate to capture all of the dust generated with a few changes.
The pickup hose should be as short as possible and increased in size to 50 mm with a skirt around the cutter and a 50 mm pickup connection.
The vac should not be that noisy. If it is then there may be some rubbish in the impeller so it may be worth pulling apart to check.
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22nd September 2020, 11:51 AM #4SENIOR MEMBER
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Thanks for the reply. I don't think the nominal 150cfm of the Fein is enough for fine dust.
I have previous used it with a dust boot with 50mm PVC and then a short length of ~50mm vac hose. It did an average job of chip collection but I'm sure not adequate for true dust collection.
Tossing up buying the Sherwood 'industrial' DC that are already set up mostly like the 2hp DC mods outlined in the sticky. Anyone got one? How are they really?
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