Dust Collection on a Miter Saw Station - Router Forums
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post #1 of 20 (permalink) Old 12-10-2018, 08:06 AM Thread Starter
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Default Dust Collection on a Miter Saw Station

So I was looking at some downdraft sanding box plans and then caught an idea floating in the old noggin, which as it turns outs is in my spell checker and is indeed a real word, go figure. Anyway I've been trying to figure out how to do dust collection on this and thought that I could build this sanding box and install one on top of my build. But then with gravity working as it usually does and this one being on earth and not the moon I thought maybe it should be on the bottom instead. Turns out I haven't committed the space above or below either way so it's open at this point. What I have at this point is a 6" PVC feed coming down to a https://www.amazon.com/Dust-Collecti.../dp/B01DJMUIJ8 box. My original intention was to install a long 3" wide channel in the hood like a linear diffuser and feed it with the two 4" hoses but after seeing the downdraft sanding box it seemed less gooder. Yeah I know but I like that word and it's clean. Then this sanding box comes along and I think maybe make a custom size and drop it on top of the hood I built but that gravity thingy kept interfering with the physics of the whole idea and thought maybe I need to make one and put it in the base (bottom). I don't think I'm going to get 100% dust collection but would be happy at say 80-85%. I did cut some heavy plastic strips to hang down to restrict the opening needed for the saw to swing for full angles cuts but expect most cuts to be at 90 degrees anyway.

So thoughts, ideas, smart alec remarks? No really, I could use some additional brain power on this if you can spare it. The miter saw station is here. Actually after looking it's not so I have one attached. Okay maybe two. After a foot of snow I tend to get some cabin fever although my neighbor, did I mention having great neighbors is fantastic, just cleared the road and my driveway. Not going out anyway until my preop Dr's appointment tomorrow. Let Mother Nature and the expected 40 degree weather do it's thing. Refreeze is likely but the appointment in town is 2:15pm so I should be golden. But I digress........

I should mention that the DC is a CV1800 with a 6" PVC main line, 17" impeller, and 5 HP system.
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Last edited by sreilly; 12-10-2018 at 08:10 AM.
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post #2 of 20 (permalink) Old 12-11-2018, 07:29 AM
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Nice looking miter station Steve. I have the same CV dust system, what fittings do you use to connect the 4” hose
to the duel 4” shut offs?
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post #3 of 20 (permalink) Old 12-11-2018, 07:58 AM
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Steve I don't know what the bottom of your saw looks like. Would it work to add a duct under the saw or is there too many openings in the saw base? If you could collect from the blade slot, I think you would catch much of the dust.

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post #4 of 20 (permalink) Old 12-13-2018, 02:18 AM
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I have a Bosch 10 inch sliding compound miter. My DC is mainly a shower curtain that fits most of the way around the saw, then gathers into a connector at the bottom. It works fairly well. I at some point will use some sheet aluminum attached to the blade 2.5 inch dust collection duct built into the saw. This will be formed into a "scoop" follows behind the blade. Hopefully, this will catch a lot of the dust before it hits the shower curtain. I'll use a hose clamp to hold it in place. Can't recall what saw had something like this "scoop", but some brand has this built in and inspired my shop-made solution. Always a good topic, given this is the worst sawdust producer in many of our shops.

The more I do, the less I accomplish.
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post #5 of 20 (permalink) Old 12-13-2018, 07:18 AM Thread Starter
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Originally Posted by Knot working View Post
Nice looking miter station Steve. I have the same CV dust system, what fittings do you use to connect the 4 hose
to the duel 4 shut offs?
This ClearVue dual port is the same one I used on the router table except that one had separate blast gates for each branch. On the router table I used a 6" metal duct fitting to connect the 6" hose and the 4" hose connects directly to the ClearView ports. I also used Fernco connectors for the 6" main connection and at the table saw. That will be redone but at the rate the Postal service isn't delivering packages in my area it will likely be after I recover from my shoulder replacement surgery this coming Monday. Just can't have enough fun these days...I did order 6" to 4" Fernco reducers so hooking one of those directly up to the table saw should get me the closest direct connection rather than cutting into the saw base and installing a 6" connector.

I've almost talked myself into buying a good 3D printer just so I can make my own reducers. Everything I've seen commercially available have been like stack a 4" can on a 6" can. Where in my mind a good reducer should be cone shaped they have a 4" cutout in a 6" flat bottom. Doesn't make sense and it does create a ton of turbulence. I'm hoping the Fernco fittings will eliminate this but they are rubber and not sure if that will make a difference. Preference would be a smooth surface like PVC or metal. The PVC 6" to 4" reducers are shaped well but again the hose needs adapters to fit. The 6" hose fits snugly inside the PVC adapter but the 4" doesn't fit over or in. Thought just fired off, maybe I should paint the inside of the Fernco fittings before using them. That would give them a smoother surface, maybe?
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post #6 of 20 (permalink) Old 12-13-2018, 07:40 AM Thread Starter
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Steve I don't know what the bottom of your saw looks like. Would it work to add a duct under the saw or is there too many openings in the saw base? If you could collect from the blade slot, I think you would catch much of the dust.
The miter saw is the Dewalt DWS780

You would get some from the bottom but most goes out the back following the blade direction. What is hard to see from the pictures with the saw installed (bolted down) is that there is a hood around the backside of the saw and it tapers to reduce the inside dimension. The thought was that the smaller the area to collect the sawdust the easier it would be to accomplish. The top and bottom slant towards each other as do the sides so the back is a smaller rectangle than the front. Make sense? Sort of like this fitting except wood (MDF) and rectangular. The constructed hood had to be large enough to accommodate the depth and side to side movement of the saw for angled cuts. That determined the overall dimensions.
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post #7 of 20 (permalink) Old 12-14-2018, 09:11 AM
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I have a similar set up as you for my mitre saw. I only use it for 90 deg. cuts so I built a box around it with a removable door on the left side that extends to the saw blade ( I can still move the saw to the right for a mitre cut and remove the door to move it to the left if I need to). Then I cut an opening in the base that the saw is bolted to which is about 4" wide then built a 3 sided box around this opening. I connected the end of the box to the DC with a 4" pipe. I also attached a flex hose where the dust bag normally goes and connected this to the DC.

This is so effective that I only get a spoonful of sawdust outside the box. I also use it to collect dust off my 1" belt sander that has no way to attach dust collection to. I place the sander in front of the right side opening and there is so much air velocity that is sucks all the dust into the box around the mitre saw.
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post #8 of 20 (permalink) Old 12-14-2018, 11:08 AM Thread Starter
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Any chance you can post a picture? Sounds interesting but I'm a bit unclear as to it's shape.
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post #9 of 20 (permalink) Old 12-15-2018, 04:19 PM
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Here's some photos but it's difficult to show the opening under the saw. You can just barely see the opening in the photo taken inside the mitre saw box. There's some aluminum tape around the opening. This collector box is at the back of the large drawer under the saw. In fact I had to cut down the back of the drawer to allow for the collector box in order to be able to close this drawer. The 4" DC pipe attaches to the end of the collector box. Hope this helps explain what I did.
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post #10 of 20 (permalink) Old 03-16-2019, 06:47 PM
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You can't catch all the dust. Just put the pipe around the bottom somewhere and when finished sweep it to clean completely. ..

http://www.jackdurencabinets.com/homepage.htm
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