Some practical things when porting cast iron, part two

I have tinkered a bit with my downdraft box. While it seems to work reasonably well with the two big vacuum motors pulling air it did not strike me as very impressive as far  as movement of air goes . While the two motors combined can move quite a bit of air ( about 150 CFM) at very high depression , it does not seem to move enough air to suck up dust when it is a bit higher up. Of course you find what you should have known before a tad after you have constructed something 🙂

http://billpentz.com/woodworking/cyclone/index.cfm

All you never wanted to know about sucking up dust..I must say that he goes a bit overboard on some stuff but hey..

I  really want to be able to port a head indoor without ruining the building/house , but on the other hand I want to keep it reasonably budget conscientious and not too bulky as space is at a premium. As I don’t produce huge amounts of dust or chips I don’t need  huge containers ( woodworking stuff tend to come with large drums to gather chips and dust) but I do want really effective dust elimination I need to make a cunning plan..

For the time being I think a am going to do a variation of this setup I’m planning to use for Pitot testing. I have bought a identical beechwood top and I am going to ad some bolts and a hole to attach to a manifold and substitute this for the top with the holes in it .

The wooden board has a 44mm radiused hole and bolt attaching to the manifold. For pitot testing you blow through while you probe the areas of interest. Brezezinski neat it is not, but it works.

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