Replies

1. 
   DougF | Mar 22, 2005 04:21pm | #1

   Mark,

   The vacuum attachments on the saw are all but worthless.  For miter non-sliding saws, sliding, and sliders as well I suppose, the most effective system I've seen is to build a collection chamber under the saw since the teeth are actually throwing the chip/dust under the throat plate as well as to the rear.  A Box collector in the rear ( the primary purpose is to deflect the dust and have it fall to the bottom where the DC can draw it in) coupled with the box collector under the saw and both connected to your DC will work very well. 

   Regarding your contractor TS, you can enclose the back but allowing for the motor assembly and belt "track" when the blade is tilted.   Another approach is to fabricate a dust deflector mounted just behind the blade.  Another method would be to fabricate a fiberglass should to enclose the entire rear area.  A fourth alternative, provided your saw is used as a stationary machine, would be build an out-table that incorporates a dust collection chamber directly behind the saw.

   The shroud is the most effective of all of the alternatives since it permits the most total fit. 

   I suppose the fifth alternative is to buy a hybrid or a cabinet saw.

   Doug

1. 
   klink | Mar 22, 2005 11:09pm | #2

   Doug,

    

   I built a venturi box out of 1/4" masonite.  A slot at the bottom of the box where it meets the counter top and parallel to it,  provides high velocity suction at the POE and walla the dust is gone!  GL.

    

   -klink-

1. 
   MarkRD | Mar 23, 2005 04:18am | #4

   Not sure I'm getting the picture with your venturi.and it's not walla it's a french word Voila meaning "There"or were you just tryin to be cute? :-)Mark

   Measure it with a micrometer, mark it with chalk, cut it with an ax.

1. 
   klink | Mar 24, 2005 04:26am | #5

   Its the Walla Halla Pasta from the Outback that gets me everytime! LOL  - 

   Here is a pic of my venturi box.  Only If I were making it again I would make the slot at the bottom a little smaller for increased velocity.  I must also tell you I have a 2hp commercial cyclone so it vacuums like a beast when all other blast gate are closed!  hope this helps you!  Let me know if you decide to build one yourself and how it works.

1. 
   RandMCapozzi | Mar 25, 2005 05:48pm | #14

   That's an interesting setup, Klink. Very clean looking. How does it work when your cutting 8/4 stock 8" wide? I ask that because under those circumstances, it takes a bit before the blade can get below the insert.

   I know for my Delta MS, that setup definately wouldn't work. The contsruction of the arm is such that the dust coming off the blade gets deflected sideways so I need a large/wide hood. That translates into big CFM and velocity to pull the dust in from quite a distance from the hood. I imagine if I were to design a little deflector on the arm of the MS, it might help.

   --Rob

2. 
   klink | Mar 25, 2005 07:00pm | #15

   Because the the teeth on the blade lifts the dust at the back and top of the plank it tends to shoot it toward the factory dust chute at the rear of the saw. The dust chute deflector in back of the dewalt saw points down toward the table top causing the dust to hit the top and bounce up only to get sucked into the venturi box.  BTW The useless bag that came with the saw looks good but that about it. 

   Occasionally I must use compressed air to blow some of the dust, under and around the far sides of the saw, toward the venturi opening.  My main goal was to provide as much negative air pressure around the rear of the saw as possible.  This helps tremendously with the fine dust that is most hazardous to our health.  I have not calculated the CFM's at the opening but I will tell you that I using an 2hp Onieda Commercial Cyclone. With all other blast gates closed it  provides a powerful vacuum.  After I finish cutting I leave the vacuum on for a short while to continue filtering the air.  (this was recommend by the engineers at Onieda)

    

3. 
   RandMCapozzi | Mar 25, 2005 08:21pm | #16

   Thanks. The Dewalt's design is far better for DC. I was quite surprised how well my FIL's Dewalt collected from just a shop vac connect to the factory port. My older Delta is horrible. The port is pretty useless (even with a vac attached) since the arm deflects the dust everywhere except the port. I've got a temp hood built right now. It has a 4" inlet due to convenience of other setups. It does OK. It doesn't get all the chips but the dust is pretty well consumed. My permanent setup will be at least 6" if not 7" piping if I can get the CFM I need to maintain enough velocity.

   BTW - I am very familiar with the Oneida. Got one myself. Very nice indeed.

   Thanks again,

   --Rob 

   Edited 3/25/2005 1:24 pm ET by Rob

2. 
   MarkRD | Mar 23, 2005 04:16am | #3

   Yup. Trade it in for a sawstop with integrated dust collection... :-) My craftsman and $3000 will get me the SStop.Though I do like your idea of building the box into my outfeed table - a relatively easy solution and it won't interfere with the tilting motor assy.Best,
   Mark

   Measure it with a micrometer, mark it with chalk, cut it with an ax.

2. 
   klink | Mar 24, 2005 04:38am | #6

   Mark,

   here's a hook-up for my craftsman contractor TS. 

    

   Klink

1. 
   MarkRD | Mar 24, 2005 05:10am | #7

   Where are the pictures?
   Mark

   Measure it with a micrometer, mark it with chalk, cut it with an ax.

1. 
   klink | Mar 24, 2005 04:20pm | #8

   Mark,

    

   I'm using the attach files button at the bottom but can't seem to get it to work! Do you want to give me an e-mail address so I can send them directly to you?  Sorry, I'll keep trying.

    

   Klink

1. 
   MarkRD | Mar 24, 2005 04:31pm | #9

   try m dot durrenberger at comcast dot net

   Measure it with a micrometer, mark it with chalk, cut it with an ax.

1. 
   klink | Mar 24, 2005 05:50pm | #10

   Trying it again! 

    

   Klink

   
2. 
   MarkRD | Mar 24, 2005 06:25pm | #11

   Got it this time.
   So that slot - about 2 inches high, gets the bulk of the dust? How many feet from the DC are you? What is the cfm of the DC? Do you have blast gates on the other ports or are they all open?Thanks,
   MarkOh and you should really get a cover on that outlet :-)

   Measure it with a micrometer, mark it with chalk, cut it with an ax.

3. 
   DougF | Mar 24, 2005 10:05pm | #12

   If you extend the box so it opens to underneath as well as behind the blade as shown, you will collect all of the dust directed downward through the throat plate.  I find that can be close to 50% of the dust/chips.

   Doug

4. 
   klink | Mar 25, 2005 12:50am | #13

   Doug,

   Thanks,  I do occasionally have to use compressed air to clean the under side and blow it towards the intake!  Thanks for the tip!

    

   Klink