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Thread: Dust collection shop vac
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7th January 2021, 05:44 PM #1Novice
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Dust collection shop vac
I got a Karcher WD 6P wet dry vacuum. Recently I connect a dust collection drum to it for better efficiency.
I see from videos in USA most shop vacs have larger diameter hoses - 2.5inch, whereas my Karcher is only 35mm.
Would it make a difference in dust collection if i connect my existing 35mm to the dust drum, then a bigger outlet that can connect to eg. Router table? Would a bigger outlet collect more?
Of course for high dust generation stuff like thicknessers I know I need a dedicated dust collection rather than shop vac, so no need to mentiom that.
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7th January 2021, 08:48 PM #2Woodworking mechanic
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Some of the workshop vacs have a 50mm inlet and outlet. They come with a 32/35mm hose with a 50 to 32/35 mm adapter in the inlet.
My SuperVac was like that so I removed the 50 to 35mm adaptor and have a 50mm hose running directly from it.
If your inlet has that adaptor or can be opened up to 50mm, go for it. Connecting 50mm hose to a 32/35mm inlet wouldn’t be worth the effort IMHO.
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7th January 2021, 10:34 PM #3Novice
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Which shop vacs have 50mm hose diameter?
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7th January 2021, 10:53 PM #4Taking a break
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8th January 2021, 07:31 AM #5Woodworking mechanic
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This the one I have
Buy Shopvac Super 20L Wet & Dry Commercial Vacuum | Godfreys
However, even thought it has a 50mm inlet, it comes with a 35mm hose and a 35 to 50mm adaptor.
See the pictures below.
0275E895-2E31-4F3C-9A29-A3D50A287E20.jpg5640F4DE-5784-4317-B57A-1073AE4EC148.jpg
ShopVac’s home website seems to indicate that they are in receivership, unfortunately, so I have no idea whether Godfrey’s have them in stock.
i simply connected a 50mm hose, using some PCV pipe, to the 50mm inlet.
61161ACD-197F-4E13-84C6-DF0A5069C625.jpegLast edited by Lappa; 8th January 2021 at 07:58 AM. Reason: Additional info
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8th January 2021, 12:11 PM #6Novice
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Yes I can see that my shopvac is 55mm opening but somewhat the hose becomes 35mm
Pasteboard - Uploaded Image
Pasteboard - Uploaded Image
I could fit in a PVC pipe and wrap a hose around it. Would this be better?
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8th January 2021, 12:12 PM #7Taking a break
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Yep
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8th January 2021, 01:27 PM #8Novice
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But bigger diameter means less suction pressure, right
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8th January 2021, 01:48 PM #9
It will only reduce the air velocity, not the pressure. A bigger hose will block less often when drawing large shavings and chunks of wood through it.
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8th January 2021, 08:53 PM #10Woodworking mechanic
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That’s all I did. Removed the 35mm hose and adaptor, plugged in a PCV fitting from Bunnies and fitted 50mm hose throughout the workshop. I use it on my sawtable fence, router table fence and SCMS. Works great.
Another important point - make sure the outlet port/exhast is also 50mm. No good having a 50mm inlet and a 35mm outlet
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19th January 2021, 01:27 PM #11Novice
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Thank you so much Lappa. I have another question. How do you reduce it further from 50mm to 38mm or even smaller for use with tools (e.g orbital sander).
I find it a hassle here and I don't understand. The shop vac in USA all come with 2.5" fittings, and they have reducer 2.5" to 1,5", followed by special adapters which can fit into the sanders.
Dust Right® Universal Small Port Hose Kit | Rockler Woodworking and Hardware
Many thanks.
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19th January 2021, 07:14 PM #12Woodworking mechanic
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If The answer is - I don’t. The 50mm pipe is too heavy and lacks the flexibility to attach to small hand tools.
However, it can be done using a $10 adaptor from Bunnies.
Here are some pictures
50m hose connected to ROS
2DB720BB-E9B6-4529-8A76-12556B45AD6C.jpeg
It can be done by connecting the 50mm hose to 35mm hose with the adaptor which is a lot better re handling.
1FC43E5E-2463-4984-96FF-EEE6A7567D4A.jpeg
The adaptor on a PVC pipe connected to the 50mm hose
CCC7F32C-D650-4179-BFB6-2B00C9098CF1.jpeg
I run a 50mm line and a 35 mm line through the workshop, each on its own Shop Vac. Stops me having to disconnect the 50mm line from fences, SCMS, router table etc. when I want to use a jig saw or ROS etc.
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19th January 2021, 10:19 PM #13Novice
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Yea that was what most people would say too. And it makes sense. My idea was - from that 50mm hose I reduce with to a 38mm hose (another one) so it becomes better for handling.
I would want to buy 2 shopvacs for this. If I had to expanding further, I would get a dedicated dust collection system using 100mm for my table saw, and keep my shopvac for hand tools
Thanks for the idea on how to reduce from 50mm to 38mm from Bunnings.
I'm still annoyed why our shopvacs don't have the bigger ports like the ones they use in USA (Rigid brand)
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19th January 2021, 10:34 PM #14Woodworking mechanic
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Most of the rigid shop vac units have a 1 7/8” inlet which is just under 50mm. You can buy shop vacs in OZ with 50mm inlets. The one I have has a 50mm inlet. I bought it from a Godfreys.
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19th January 2021, 11:24 PM #15Senior Member
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I have that Karcher WD6 and use it for general shop vac duties and handheld tools, it's ok. I was on the market for another one to have it dedicated on the router table, and then I realised there's really no point since I found on Timbecon a mini 50L DC for $200. Another shopvac wouldn't really be cheaper, or smaller, or suckier
Only 1100W but should be plenty for what I do, and I finally have the option to connect my bandsaw to something. Bags are cheaper-than-karcher too.
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