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I think if you try to put a vac on a miter saw hood you will be extremely disappointed with how much of the fine dust it catches. I tried several with a strong DC and a 4" hookup and couldn't even come close. I then tried the hood with the DC and a vac hooked to the blade guard port…it really didn't help much, if any.
 

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I first hooked up a ridged shop vac to my 12" miter saw, it worked ok but the filter clogged with the fine dust quickly. The suction of the vac drops as the filter begins to get clogged making the setup less effective.

Next up was the use of a dust deputy between the vac and saw. This works ok as well but the filter does not get filled.

I do not have a dust hood. The hose is connected to the saw on the port where the stock dust bag was. I do not think the dust collection on either of my miter saws will ever meet my expectations.
 

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Hi;

Miter saws are notorious for throwing dust around. Sliding compound miter saws are even worse, as they have an even larger area to try to contain the dust from.

That said, what I did I was to hook up a dedicated dust collector that is connected to a switch, which prevents the saw from working if the switch isn't on, which in turns ensures that the dust collector is used whenever the saw is used. (critical when you have employees in the shop). see here: http://lumberjocks.com/LeeJ/workshop# It also has 2 halogen spotlights shinning light on the cut area.

It has a 4" hose leading to a 4" 90 degree ell, which is aimed towards the area the dust is thrown to from the saw. When I'm using the saw, I have made a practice of leaving the switch on for a few minutes after using the saw, which helps in keeping the area and the air clean.

While this isn't 100% effective in collecting all the dust, it is an acceptable solution, and doesn't interfere with the saw's' functions. Just some minor housekeeping keeps the area acceptable to me. (and I'm only slightly anal!)

Lee
 

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some of the saws are better then others .look at a kapex or the milwaukee . both of these do ok .note they both have flanges on the sides to help channel the dust to the port . i have used duct tape and ridged plastic on my dewalt 12 inch non slider to extend the port and got as good of results as my kapex . i am talking about with a vacuum . like previous poster said a cyclone before the vac really really helps . though they have highend vacs like festool that do not have the plugging filter problem .
i use the bigger vacs for my mitersaw . the sliding saws being the dust port usually gets farther away from the fense are harder to design a catch system .
i also own the big milwaukee saw .this saw has large dust port that will accept a 4" hose for a DC . with a 1Hp DC this saw really has great dust collection .hope that gives you a bit of useful info .
 

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getting collection at the MS comes down to CFM, and the air movment around the saw, if you want to get dustcollection going for your shop I'd really suggest taking a look at getting a DC unit. I tried for years with the shop vac and once I found a good deal on an actual DC it has been night and day. Once you've got the DC you can "get around" to the hoses and runs etc, I just started out with two 10' flex hoses and switched it between tools as needed, and eventually ran a second run along the wall for the MS and sanding stations
 
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