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Router table with 2.5" Dust Control output(?)

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Forum topic by Marleywoodie posted 01-04-2020 09:48 PM 450 views 0 times favorited 7 replies Add to Favorites Watch
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Marleywoodie

45 posts in 1231 days


01-04-2020 09:48 PM

I bought several “purpose built” custom router tables in an asset purchase of a small woodshop. Everything in the shop is set up for 4” DC connections, except for one which has a 2.5” output. That table has a function that tends to put out a lot of sawdust, so I’m thinking it was built this way because the reduced diameter creates a stronger suction for this table? I’m replacing all my DC piping, and wondering if I can make this table 4” like all the others?

-- - Not all who wander are lost -


7 replies so far

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sansoo22

1001 posts in 456 days


#1 posted 01-04-2020 10:03 PM

I’m not a dust collection expert so hopefully others will chime in but I would take it to 4” if it were me. From all the reading i’ve done its all about the volume of air you can move. Someone who can math could calculate the volume of 2.5 vs 4.

I have an over arm pin router table with 2 routers attached. One above and one below the table. I’m putting a 2.5” fitting in the fence and a 4” in the back under the table.

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Marleywoodie

45 posts in 1231 days


#2 posted 01-04-2020 10:19 PM

The DC ducting that will run by the table is 4”, the question is to use a 2.5” gate as it is now, or to change to 4”.

-- - Not all who wander are lost -

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Andybb

2783 posts in 1405 days


#3 posted 01-04-2020 11:51 PM



The DC ducting that will run by the table is 4”, the question is to use a 2.5” gate as it is now, or to change to 4”.

- Marleywoodie


I’d stick with 2.5 for the router, both for the fence and under the table. You need “dust” suction vs “chip” suction for a router. Plus, a 4” hose seems kind of unwieldy attached to a router fence. Every fence I’ve ever seen has a 2.5 port on it even if it does connect to a 4” system.

-- Andy - Seattle USA

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Madmark2

1454 posts in 1390 days


#4 posted 01-05-2020 12:01 AM

2-1/2” dia ~ 4.9 sq in area
4” dia ~ 12.6 sq in area
12.6 / 4.9 ~ 2.5x area

M

-- The hump with the stump and the pump!

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Fred Hargis

6305 posts in 3295 days


#5 posted 01-05-2020 11:36 AM

I’d change it to 4”. iot takes air flow to catch dust…and you get quite a bit more with 4” (see Mark’s post above) assuming you have it connected to a DC instead of a vac. I’d bet it’s a 2.5” port because it was on a vac instead of a DC.

-- Our village hasn't lost it's idiot, he was elected to congress.

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Marleywoodie

45 posts in 1231 days


#6 posted 01-05-2020 12:58 PM



I d change it to 4”. iot takes air flow to catch dust…and you get quite a bit more with 4” (see Mark s post above) assuming you have it connected to a DC instead of a vac. I d bet it s a 2.5” port because it was on a vac instead of a DC.

- Fred Hargis

I understand your thought process about the vac, but I saw the machines “in situ” in the old shop, and it was not hooked to a vac, it was all hooked up to a 4” hose DC system with a “T” attachment stepping the one hose down @ that router. However, whilst writing this, I looked up pictures I have of the “original” shop they were installed in and it was all hooked up to a 4” hose DC system. So, I guess I will change it back!

-- - Not all who wander are lost -

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Andybb

2783 posts in 1405 days


#7 posted 01-06-2020 12:33 AM

I’ve just never seen a router fence with a 4” port on it. I may be wrong but I don’t think it matters how big the line to the DC is, the output from the fence is still 2.5”. On a side note and unrelated to this thread since the OP is using a DC…. a DC does move more CFM but a vac sucks harder (creates more vacuum) which means that a 4” hose restricted down to 2.5” from a DC won’t suck as hard as a 2.5” from a shop vac.

DC or vac doesn’t matter anyway as a router makes dust, not chips like a planer or jointer so I think you gain nothing trying to put a 4” hose on a router fence. So, in short, you can run the 4” to the router location but I’d still have the 2.5 coming off of the the fence and under the table then “T” ing into the 4”.

-- Andy - Seattle USA

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