Dust collection advice - Router Forums
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post #1 of 22 (permalink) Old 09-11-2014, 08:09 PM Thread Starter
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Question Dust collection advice

I am ready to set up my dust collection. I have HF collector. The collector has a 5 inch outlet with a 4" y adapter. I want to use 6" ducting for the main run. Can I eliminate the "Y" adapter and use an adapter to go from 5" to 6'' at the outlet? Also I would like to eliminate the bags altogether and vent directly to the outside. Are there any issues in doing this??
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post #2 of 22 (permalink) Old 09-11-2014, 08:41 PM
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You would still have a 5" minimum size restricting air flow. I have the same 5" limitation on my Grizzly. I have thought about just cutting the hole out to 6", or just replacing the cover/port with one from a newer 6" model.

As for venting outside, it will work well enough. But, if your are conditioning the inside air, could raise your air conditioning cost considerable. Also need to think about where the dust is going to go... have open space enough that it won't bother you or your neighbors... should be ok.

I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.

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post #3 of 22 (permalink) Old 09-11-2014, 11:17 PM
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I'm assuming you bought the 2HP DC? What is the length of your run? The number of drops and what diameter are they?

I have that DC. only a 20 foot run with 2- 4" drops with gates, 2 2-1/2" drops with gates.... 4" and 2-1/2" pairs. One pair at 10', other at the end at 20'... I used 4" ABS for my run, and used 4" abs tees. Adapted the 4" ABS drops to DWS. from there to hoses.

I have a trash can cyclone separator before the DC, then a cartridge filer in place of the filter bag.

That DC would not keep up with my TSS saw. It has a 4" DC and the base, 3" on the overhead guard. I had to mod it with a 12" impeller to up the flow. Then have to use a cartridge because the mod and increased flow cause too much back pressure at their filter bag (not enough flow through it). The vacuum itself stock was less than 7 water ". Afetr mod... if I use a single 1-1/4 hose to a smaller tool, I have to partially open another gate to keep from callaing the drop lines or my HD metal trash can separator.

Let me explain what Duane was implying about changes of diameter ducting. DC's work through flow rate to keep the particle suspended until they get to a separator, where the particles then lose suspension. That is why separators work... the flow opens up in diameter, a cyclone swirl effect, where the particles move to the outside, where it loses speed and drops out of suspension. You get from a 4" inlet in the separator, at an angle to cause a swirls, into a large area... and there is varied speed of flow from the center to the outside diameter.

Say you start at 4" duct at your table saw. You get to the 5" duct... and you will lose some of that suspension. True, overall, the flow will be the same throughout, because you have nothing less than 4" but the flow rate will still vary between the two ends.

Now, with a small DC that was over-etstimated on it's flow... something like that will lose some of your effectiveness where it might effect your flow... or not. If a short run run, you might not even notice...

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post #4 of 22 (permalink) Old 09-12-2014, 07:02 AM
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That's what I'm working on now for my shop. I made a cyclone collector that catches all the large stuff and the back of my shop faces woods so the small particles will just blow off into nowhere. My shop is only 20 x 20 and I have adapted all my tools to accept the same size hose connecter. Bought an outside dryer vent that closes when the air is not flowing on the outside of the shop. Will update when I get it finished.
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post #5 of 22 (permalink) Old 09-12-2014, 07:33 AM
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Mine is the same DC. Can't comment on the hose sizes as everything mine connects to is 4". Well, one comment...why not use a 5" to 4" reducer at the machines?
Mine is vented outside. My shop is 24X36 and it's heated. Have not noticed an appreciable loss of heat by venting outside. Did notice an appreciable increase in the DC's efficiency and really like the added space by getting those bags out of the shop. Not to mention not having to empty and clean them.
I'm in N. AZ at 6500', so AC is not the concern it might be in PHX.

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post #6 of 22 (permalink) Old 09-12-2014, 07:46 AM
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Hi Mike, This explains what I did in our small shop. Although we are only using a 1HP HF unit, it does work very well. We have absolutely no problems with fine dust outside on the grass or sidewalk.

http://www.routerforums.com/general-...n-finally.html

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post #7 of 22 (permalink) Old 09-12-2014, 08:55 AM
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Dust collection is an entire subject unto itself. Remember there are several components to running HVAC (that's what it really is) The larger the line dia the lower the velocity and thus you may not be able to move objects and dust may accumulate on the walls as the velocity is lower due to laminer flow charasteristics. A 2" line will provide greater velocity but lower total CFM. The only generality that seems to work is buy the most CFM and vacum pressure (-"Hg) you can afford and let it suck like the dickens, other than that use your pen and paper before you purchase anything.

Good Luck Baker
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post #8 of 22 (permalink) Old 09-12-2014, 11:34 AM
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You could adapt the 5" to 6", don't know if you would gain enough to be worth it or not. I plan to vent my 2Hp HF outside when I get a chance, I already vent my 1Hp HF outside and like it. Both of my DC's pull through a Thien style separator and I really like that.

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post #9 of 22 (permalink) Old 09-13-2014, 11:42 PM Thread Starter
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Thanks for all the info. I am not quite sure what to do at this point. My shop is a barn design so I have plenty of room on the second level for the DC and to run the main ducting and then down through the ceiling for the secondary's . With this in mind I really need to get it right the first time. I have attached a diagram of the way I intend to lay out my shop. Any constructive criticism, suggestion's would be appreciated .
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post #10 of 22 (permalink) Old 09-14-2014, 10:25 AM
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Mine runs around the perimeter of my shop so I'm not sure how well your idea will work. It will require more energy to lift the particles to the loft than my method. That is a fact of physics. I just don't know how much more energy will be needed and whether some of the material will drop out of suspension or not get picked up. Since you say this is a one time shot it would be a good idea to do some testing first and try putting your DC in the loft and run a hose down the outside wall and see what it can pick up and whether a bunch of dust comes back down the pipe when you turn the DC off.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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