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04-06-2008, 05:25 PM
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#31 | | Vice-President
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Name: Rob City: Hendersonville State: NC County: Henderson Join Date: Nov 2005 Age: 66 Avg Visit Freq/Week
= 7.00 over 30 days |
Why push it with compressed air when your could pull it with a shroud around the blade below the table to pull the dust from the gullets on its first pass after to cut -- I suspect the force of cut moves the chips/duct into the gullet with the cutting action and then centrifugal force pushes it back out as it comes back around. The key to locating the shroud (aside from essential obstructions) is to determine where in the rotation those two forces are neutral or positive to rejecting the chips and into a DC shroud. Just a guess, but might help design it.
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Rob  Truths: There is no such thing as a 25 hour day, so why do I keep trying to cram so much into every day so it seems that way!   |  
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04-06-2008, 06:13 PM
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#32 |
Name: Alan Schaffter City: Washington State: NC County: Beaufort Join Date: Dec 2005 Avg Visit Freq/Week
= 7.00 over 30 days |
The best way to do it with the existing shroud/deflector, without-compressed air, might be to always use a zero clearance insert and to tightly seal the cabinet, except for one or two air inlets. This might be a little hard to do around the height and tilt adjustment wheels. The inlet pipes would be smaller than the DC outlet so the velocity is high, and be located somewhere very close to the point where the dust and chips are most easily separated from the blade/gullets, wherever that occurs. Plumb the DC pickup for suction at both the bottom of the cabinet ramp AND at a point near and behind where the blade is being hit with the incoming air.
Another idea is to design a blade shroud that completely encapsulates the entire blade below the table. You would need a flexible (soft) attachment from the trunnion to the underside of the top so that the blade and motor could go up and down, and tilt. Again, you would make it so the take-up air blows directly on the blade. | |
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04-06-2008, 06:21 PM
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#33 |
Name: Reggie City: Albemarle State: NC County: Stanly Join Date: May 2007 Avg Visit Freq/Week
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I'm REALLY enjoying following all the "design" thought processes on this thread.  You guys are something! I'm looking forward to being the beneficiary of all this "armchair engineering" and brainstorming!  Thanks for ALL the input! Keep it coming! 
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04-06-2008, 06:51 PM
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#34 |
Name: Steve City: Carrollton State: VA County: Isle of Wight Join Date: Jan 2008 Avg Visit Freq/Week
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Remember, the air jet was just an experiment in order to verify that the dust actually is traveling all the way around the blade and out the top. Just wanted to make sure we understand the problem before we solve it. | |
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04-06-2008, 06:55 PM
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#35 |
Name: Steve City: Carrollton State: VA County: Isle of Wight Join Date: Jan 2008 Avg Visit Freq/Week
= 0.00 over 30 days |
Originally Posted by Alan in Little Washington  Another idea is to design a blade shroud that completely encapsulates the entire blade below the table. You would need a flexible (soft) attachment from the trunnion to the underside of the top so that the blade and motor could go up and down, and tilt. Again, you would make it so the take-up air blows directly on the blade. Good idea Alan,
What we might find is that flow across the blade is the best way to pipe a tablesaw for DC. Might just have to put a port in the side cover on my uni and see. | |
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