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starting my dust collection journey, first stop chop saw

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Forum topic by jpc posted 03-17-2012 06:37 AM 2326 views 0 times favorited 6 replies Add to Favorites Watch
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jpc

139 posts in 1904 days


03-17-2012 06:37 AM

Topic tags/keywords: miter saw dust collection pvc question

My wife bought me a porter cable 1 horse power dc from lowes almost a year maybe more ago, now that the house renovation is over and work is slowing down i started working on hooking it up, Ive learned its severely under power coming out of the box, and would have to have ideal set up for it to be somewhat effective,My plan , 2 tools, TS , chop saw,,,,I have a 4”x4” wye coming off collector. Blastgate from woodcraft in both directions,being that I got rid of sliding compound miter saw for a 10 dewalt chop saw, I have plenty of room towards rear of cabinet behind saw as you can see from the pics, and now for my first question,, I had a 4”x2” wye in the pile so decide to put it in line on way to dust hood, the 2”branch connected to 2” Flex hose then connected to port on the back of saw.Then right behind that wye a couple sweeping 45’s going up to back of saw where the hood would be, Any thoughts as to whether that will be effective or hurt the set up, or will it do anything at all.And if anyone has in tips or thoughts good or bad , im all ears since this is all new ground for me.Thank you in advance for any input,once i get this one wrapped up its on to the TS where im sure Ill have another stupid question, thanks


6 replies so far

View Tenfingers58's profile

Tenfingers58

80 posts in 1401 days


#1 posted 03-17-2012 09:51 AM

jpc,
I have a DeWalt DW705 which is similar to yours; I hooked up my dust collector (Jet DC650) like you plan to do and got almost no suction/collection from the small hose.
What ended up working for me was a garage sale shop vac connected to the connector on the saw and the dust collector connected to the dust hood behind it.
My Jet is definitely a one machine at a time dust collector. I have read many “upgrade” it with a Wynn filter for more flow and finer filtering. The Wynn filter idea doesn’t work for me because it would cost more than I paid (albeit used) for the Jet in the first place. To protect their filter and to not have to empty their collector as often I have seen (on the net) many use a Thien baffle. http://www.cgallery.com/smf/index.php It looks like a good idea; I just haven’t had the time to make one yet.

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jpc

139 posts in 1904 days


#2 posted 03-17-2012 11:02 AM

hey thanks for the responce, Ive got some peice work here and there with the thien baffle, scattered around but no where near comlete. As i was mapping out and hooking pvc togather , it just popped in my head, “Hey ,,,You havent seen anyone else’s set up that way because it dont work, not because your a genius”lol Thanks for noting that our tools are similar enough, in that your experience probibly just saved me some unneccasary work and headach. I think ill just keep going with the 4 inch like to hood,minus the 2 inch branch. thanks again

View hate2sand's profile

hate2sand

7 posts in 993 days


#3 posted 03-17-2012 01:19 PM

jpc

I don’t think you will get any suction out of the 2” branch. Generally on a branch for that type collection, radial arm saw, chop saw, etc, you have to reduce the line size to the hood by at least one pipe diameter to get any suction out of the small branch. In you case your wye fitting would have to be 4×3x2. Otherwise all of the air flows from the hood. Also, you won’t get much air flow through a 2” flex hose no matter what you do, there is just too much friction loss in that small a hose. You might go with a 4×3x3 wye and use 2-1/2 hose to the saw port and have some success since the chop saw creates its own air flow to the port.

I think what Tenfingers58 states above is where your going to end up. A shop vac generally has a larger suction lift that a dust collector and will suck through a smaller hose.

-- Larry in NC

View RussellAP's profile

RussellAP

2963 posts in 1010 days


#4 posted 03-17-2012 03:15 PM

I don’t think anything can suck up miter saw dust, at least not all of it. I just put a 4×8 sheet rock wall behind my saw and use the shop vac afterward. DC works great on TS and BS but miters just kick out too much to contain it all. Plus most Miter saws have no DC ports so you have to rig something up.

-- A positive attitude will take you much further than positive thinking ever will.

View BlankMan's profile

BlankMan

1487 posts in 2076 days


#5 posted 03-17-2012 08:01 PM

Yeah I had the same issue trying to suck up the sawdust from my miter saw, the trick is good suction and a good hood behind it. After a few tries I finally nailed the hood, take a look here, the last installment has a video that shows it’s effectiveness.

As for the ducting, every 90 degree elbow equates to something like 10’ feet of straight pipe, the longer the run the more the losses. So shorter is better and long radius elbows, although harder to find are better, and using the absolute minimum. Coming off the trunk with a wye then using a 45 degree elbow is better then using a tee that comes off at a 90.

There’s a lot of resources on the web that will tell the equivalent loss of a elbow or wye in straight pipe, there are books on dust collection that you can get at Rockler and Woodcraft if you have any near you. They’re not perfect but are very helpful. When I started out dust collecting I got the books and read everything I could find. Even got some industrial level mechanical books.

-- -Curt, Milwaukee, WI

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jpc

139 posts in 1904 days


#6 posted 03-18-2012 05:20 AM

thanks everyone for input,Blankman..I checked it out from start to finish,To say you nailed it is an understandment, Great work,. How about any experiences or thoughts about the particular collector I have, and hell if it turns out I cant get what I want with the miter saw, the shop vac is a solid option, and that would leave just one tool for the collector to take care , if still going by me original plan, so maybe thats a plus

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