Router cabinet dust collection size??? - Page 2 - Router Forums
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post #11 of 24 (permalink) Old 12-19-2018, 12:37 PM
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i'd think 4" if you got it. im closing in an old open wood frame table soon but only have a shopvac and am stuck with a smaller hose for both for now
Have you got 2 shop vacs?

nah just got one a 9 gal rigid. maybe the best thing to do is hook up to the fence and let the floor have the rest until I can get a HF collector and a big filter before I close the stand in.


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he's really gonna need to vent the motor...



I was gonna use a round vent from an old weber grill or make something like it but that snorkel stuff looks great
Tim as explained in another similar thread about a week ago, a vac works by floating the dust particles in an air stream. The dust you get under the table is mostly random particles. There is usually very little room between the bit and the table insert (by design as we change inserts to closely match bit diameter). Remember that all the dust (as in 100%) gets created above the table, it's just that a few collisions among the particles cause a few to head downward past the bit, through the narrow insert opening. So obviously the most effective location for a DC pickup is as close to the bit as you can get above the table. You can also put a pickup under the table to try and catch those random particles that head down too if you want. Also keep in mind that you need an opening leading to the DC hose that is at least equal to the cross sectional area of the hose or you won't have a sufficient air stream to float the particles in. So for a 2" hose you need 3.15 square inches of opening and for a 4" hose you'd need about 13 square inches of opening.
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post #12 of 24 (permalink) Old 12-19-2018, 07:41 PM
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I have a 5” hose to the cabinet (from my 2hp DE) that draws fresh air from a slot at the front of the cabinet,across the underneath of the cabinet top and the router head, to the 5” outlet at the back. I also have a 2” on the fence to a separate ShopVac.
No dust at all in the cabinet.

Last edited by Lappa; 12-19-2018 at 08:19 PM.
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post #13 of 24 (permalink) Old 12-19-2018, 07:48 PM
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I have a 5” hose to the cabinet (from my 2hp DE) that draws fresh air from the front across the underneath of the cabinet top and the router head. I also gave a 2” on the fence to a separate ShopVac.
No dust at all in the cabinet.
no cooling fresh to the motor either...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #14 of 24 (permalink) Old 12-19-2018, 08:33 PM
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no cooling fresh to the motor either...
Correct. The Venturi Effect of the air crossing from one opening to the other causes the box to be at negative pressure. The principle is what makes a carburetor work or that tee that is used to empty water beds by pumping water through a garden hose. The water flowing past the tee opening causes a vacuum just inside the tee opening which pulls the water out of the water bed.

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post #15 of 24 (permalink) Old 12-19-2018, 08:45 PM
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I put the latch on the door on the inside and that opened the door about 1/2". I have a 4" hose connected to my big DC and a 2.5" hose connected to my fence connected to my shop vac. I pulled my router Monday to clean it out but there was nothing to clean. If all my tools were as easy to control the dust as my RT I would be in hog heaven.




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post #16 of 24 (permalink) Old 12-21-2018, 02:57 AM
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no cooling fresh to the motor either...
The slot at the top of the door directs an airflow across the router base, where it connects to the underneath of the table, to carry the dust out but there is still sufficient air to, and around the router body to cool it. It’s all about directing the air to where it is required.
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post #17 of 24 (permalink) Old 12-21-2018, 03:12 AM
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This concept of almost closing off the cabinet is a mystery to me. Obviously there has to be replacement air into the cabinet (and a lot of it!) or the suction is drastically hampered.
I think folks are concerned about dust escaping into the room unless the cabinet is essentially sealed up(?)...
This is basically the same issue that affected condos and homes in the '80s. Homes were so tightly sealed up that kitchen and bath fans were almost useless. Same thing applies in reverse in a heating system; if you close the door to an area and there's no cold air return, the forced air furnace will heat wherever there is lower pressure and the sealed area will get little or none.
if you're worried about dust getting out, cut a big vent and install a furnace filter. Maybe low down on the back or side?
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post #18 of 24 (permalink) Old 12-21-2018, 04:19 AM
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The slot at the top of the door directs an airflow across the router base, where it connects to the underneath of the table, to carry the dust out but there is still sufficient air to, and around the router body to cool it. It’s all about directing the air to where it is required.
I'm talking about providing outside air to the motor for cooling interdependently of what the DC is doing......
see the PDF...

.
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File Type: pdf Venting a router table's motor with DC....pdf (87.0 KB, 12 views)

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #19 of 24 (permalink) Old 12-21-2018, 01:43 PM
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The slot at the top of the door directs an airflow across the router base, where it connects to the underneath of the table, to carry the dust out but there is still sufficient air to, and around the router body to cool it. It’s all about directing the air to where it is required.
That still puts the enclosure at a lower air pressure than the air outside the box. You may be sucking across the base past the bit but where does the makeup air that is going through the router's fan come from? Air is being sucked out of the box with no intake near the fan inlet at the other end of the router.

Also, the router's heat is exchanged to the air molecules passing through the motor. The lower pressure in the cabinet is caused by fewer air molecules on the inside than the outside. Fewer molecules mean reduced heat transfer.
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post #20 of 24 (permalink) Old 12-21-2018, 02:20 PM
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I'm talking about providing outside air to the motor for cooling interdependently of what the DC is doing......
see the PDF...

.
the main reason I want to close up the open stand is for bit storage and shelves for other routers ect. would this pass muster for a snorkel if I box it in? I want it to pivot out of the way when I open the door to get to speed controls on the 1617 now and the 7518 should i ever go mast r lift.
excuse the lousy image. I don't speak sketchup. that's just the router area with a baffle and that's supposed to be the door left of the box.
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Last edited by twmv86; 12-21-2018 at 03:54 PM.
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