Vac for the table saw , tubing question

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Forum topic by belgium posted 01-08-2014 06:46 PM 528 views 0 times favorited 4 replies Add to Favorites Watch
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22 posts in 1037 days

01-08-2014 06:46 PM

Topic tags/keywords: question

I want to place a dust collection on my table saw . The port at the bottom of the saw is 4” . The port from the saw hood is 2” . I purchased a vac whit 2,5HP and inlet 4”. I made a T piece to connect both ports.
The inlet sides are 4” en 2” , connection to the vac is 4”.
I made a test and there is almost no suction on the 2” side , witch is understandable the air takes the way whit the least resistance. Should I make both ports 2” ?

-- Greetings from Belgium

4 replies so far

View Dallas's profile


3599 posts in 1907 days

#1 posted 01-08-2014 07:06 PM

This is just my thinking but here goes:
The saw blade on your table saw only cuts on the down stroke which means the majority of the sawdust is being forced downward on the front of the saw.
The only reason(s) I can see for a hood on top are, 1.) If the back side of the cut is not co-planar to the front and the backside of the blade is making sawdust. 2.) If the bottom is closed off to moving air too much, which makes the vacuum less efficient. 3.) If you just don’t have enough power in your DC to move the needed amount of air. In which case I would use a shop vac hook up to the hood.

Your mileage may vary. Objects under tee shirt are larger than they appear. Do Not Try this at home. Children under the age of 45 years old should be supervised by a responsible adult female. Closed course with professional driver.

-- Improvise.... Adapt...... Overcome!

View belgium's profile


22 posts in 1037 days

#2 posted 01-08-2014 08:04 PM

The use of a separate vac for the hood is a consideration , I must calculate the amps for two vac’s and the saw…

-- Greetings from Belgium

View Fred Hargis's profile (online now)

Fred Hargis

3842 posts in 1913 days

#3 posted 01-08-2014 08:14 PM

You’re trying to make a shop vac do the work of a DC, and the results will be marginal no matter which direction you go. But a separate vac on the blade might do an acceptable job with the blade cover.

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

View belgium's profile


22 posts in 1037 days

#4 posted 01-23-2014 05:31 PM

I did not know what a DC means , now I now , the CFM is very high compared whit a shopvac .
I love American tools and a jet DC 1100A is arrived , a micro filter is also arrived .
It is the design and form from the impeller that makes the difference , I added a extra motor to my shop vac , now a have 3200 watt , 4 HP power . It sucks ….. The motors from the dyson vac are very cheap , 18$ shipment inclusive. Mounted on a dust bin and you are in business.

-- Greetings from Belgium

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