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Blade Dust Collection5/14
Has anyone had success collecting dust off of table saw blades ? Is there a theory about a circular shroud that draws the dust away from a blade as compared to just building a box under the whole saw to collect from ? My box is very big ( Tannewitz 16" T-saw) so I want to narrow the collection closer to the blade.
Take a look at the Sawstop guard system. I believe they state that their system will collect almost all the dust from the blade.
The system is comprised of below the table collection on a 4" port in the closed cabinet and a small dust hose that goes to the clear plastic blade guard/splitter.
We don't have a hose to the guard/splitter and just plugged that outlet hole. Even so we probably get 60% to 75% of the dust into the collector through the below table 4" suction port.
Please see attached sketches for optimum source capture. Make sure there is at least an inch and a half clearance from blade to all sides of the hood. Make prototypes out of cardboard.
Click the link below to download the file included with this post.
The sawstop guard does pick up a lot of the over the blade dust. I believe the reason is, that it has a curved forward section that takes the dust being accelerated forward off the top of the blade, and defects it up and backwards, into the dust hose/air stream.
The reason most "hood" style over the blade guards are so poor, is that the dust is traveling at too high a velocity to get "sucked" into the hose (usually up on top) and gets thrown forward towards the operator and out under the guard.
I formed a curved piece of Lexan, and installed it in my guard of our large Griggio 14" panel saw. The curved piece fits snugly in between the side plates of clear acrylic of the guard.
Now, the dust also gets "caught" by this curved piece, thrown upwards and back - towards the dust collection hose, and even cutting sheets of melamine or MDF, not much dust gets thrown out from under the guard. Its a very simple modification that took literally minutes to make, and works amazingly better than the stock guard.