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best solution for Mdf dust?

pedroghne

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Mar 10, 2013
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14
I just picked up the 2hp dust collector from harbor freight. Iwant to add a pre sseparator. I mostly cut mdf for car audio builds. what would be the best solution to catch the mdf dust before it gets to the filter. would a dust separator did be sufficient

thanks
 
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Tim The Tool Man

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I built a Thien type separator a few years back. Here is a link to the Bill Thien website where you can learn all about it...

The thing works great. I can cut, chop, and mill MDF all day long and not have any mess in my shop or any bags to fight with on my dust collector. In fact I have not had to clean my dust collector bags in over 3 years now but I have emptied the separator drum maybe 10 to 15 times. I just have to slap my dust collector bags with a stick every now and again to knock down and fine dust that might be stuck in the fabric. I could actually vent the collector directly outside and bypass the bags totally without messing up my yard.

I put the separator assembly on a simple hoist system and the drum has castors on it's base so emptying it is real simple.

I made mine out of a 55 Gallon drum, some plywood, 6" ducting, some odd assorted hardware, and a "Hoover" logo I stole off the internet.

dustcollector1.jpg


dustcollector2.jpg
 
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pedroghne

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Mar 10, 2013
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i seen the thien seperator . the only thing that it doesnt really say is how far the bottom piece should be from the elbow
 

Gary S

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I have a simple solution for MDF dust. I never buy, use, or cut MDF. It is an inferior product that I refuse to own or work with. Use something better and avoid this problem.
 

thunderchunky

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Mar 19, 2011
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Northern NJ
I have a simple solution for MDF dust. I never buy, use, or cut MDF. It is an inferior product that I refuse to own or work with. Use something better and avoid this problem.

MDF is great for speaker builds - what else would you recommend for a speaker build?
 

Gary S

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I don't recommend MDF for anything. If you can't find a better product, then reconsider what you are doing. Plywood made from real wood layers outperforms MDF in every way.
 

paranoid56

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Dec 18, 2008
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San Diego, Ca
I don't recommend MDF for anything. If you can't find a better product, then reconsider what you are doing. Plywood made from real wood layers outperforms MDF in every way.

you have no idea what you are talking about :lol:
- It is dense, flat, stiff, and has no knots.
- MDF has no grain (as it is made up of fine particles) so it can be cut, drilled, machined and filed without damaging the surface.
- It is an environmentally friendly product (as it’s a recycled material).
- It doesn’t split (because there is no grain).
- It's not expensive.
- its dimensionally stable
 

Daedalus

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Sep 28, 2009
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+1 for the Oneida Dust Deputy linked above. I'm almost to filling it up for the 3rd time, and there's hardly anything in my ShopFox dust collector. Bought mine from Amazon.
 

ddawg16

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I have a simple solution for MDF dust. I never buy, use, or cut MDF. It is an inferior product that I refuse to own or work with. Use something better and avoid this problem.

I don't recommend MDF for anything. If you can't find a better product, then reconsider what you are doing. Plywood made from real wood layers outperforms MDF in every way.

you have no idea what you are talking about :lol:
- It is dense, flat, stiff, and has no knots.
- MDF has no grain (as it is made up of fine particles) so it can be cut, drilled, machined and filed without damaging the surface.
- It is an environmentally friendly product (as it’s a recycled material).
- It doesn’t split (because there is no grain).
- It's not expensive.
- its dimensionally stable

As paranoid said......you really have no idea what your talking about.

I don't use it much....mainly because I'm a 'stained wood' kind of guy....

But.....

When it comes to things like crown molding....the stuff is fine...easy to put up....easy to cut....easy to match....

No, you don't want to use it in wet locations...much the same way you don't use untreated wood in the ground.....

So...instead of making an unqualified statement about MDF....why not make a qualified comment about the original question from the OP....how to control the dust.....this is not the free parking section.
 

Daniel Dudley

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Sep 4, 2009
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I have seen cyclonic separators on the market recently that go over 55 gallon drums.

I haven't tried one yet.
 
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Tim The Tool Man

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i seen the thien seperator . the only thing that it doesnt really say is how far the bottom piece should be from the elbow

I'll pull my separator apart later today and take a few pics of the interior for you.

...and MDF has many uses and is the product of choice for things like speaker housings and milled items that are going to be painted.
 

djjsr

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I don't mean to hijack this thread but it's relative.

Do any of you guys run a ground wire through your dust collection system? I currently do not have my system grounded but do not have any problem with static charge and I'm not sure why. I keep my shop at 60 degrees in the winter with electric heat and the humidity is around 25%.

The system is flexible hose from a tablesaw, router table, miter saw and belt sander, all connected to a 15' long 4" pvc manifold which is connected to the dust collector with another short section of flexible hose.

It seems like I should have a problem but for some unknown reason I don't. I'm thinking that I should run a bare copper wire through the 15' pvc and connect it to my grounded metal conduit.

Opinions?
 

Oxidd1979

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Montreal, QC
I don't mean to hijack this thread but it's relative.

Do any of you guys run a ground wire through your dust collection system? I currently do not have my system grounded but do not have any problem with static charge and I'm not sure why. I keep my shop at 60 degrees in the winter with electric heat and the humidity is around 25%.

The system is flexible hose from a tablesaw, router table, miter saw and belt sander, all connected to a 15' long 4" pvc manifold which is connected to the dust collector with another short section of flexible hose.

It seems like I should have a problem but for some unknown reason I don't. I'm thinking that I should run a bare copper wire through the 15' pvc and connect it to my grounded metal conduit.

Opinions?

Static will not always occur with PVC pipes. It all depends of your setup. Usually, for smaller home DC system (under 5hp), static rarely occurs, there,s just not enought wood dust/velocity/air going in the tubes.

BTW, you would have a better system if you switched to solid 4 inch pipes, but still restricting, 6 inch would be way better. 4 inch cannot provide enough CFM to properly clean a table saw. Check your DC. Mine had a 3x4inch intake. Once removed, i had one 8 inch intake that I reduced to 6inch. For now I'm stuck with a 6inch flexible, but switching everything to solid galv. pipes (6inch) this summer with the smallest amount of flexible as possible.
 

marypitts745

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Apr 13, 2013
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It seems like I should have a problem but for some unknown reason I don't. I'm thinking that I should run a bare copper wire through the 15' pvc and connect it to my grounded metal conduit.
2.gif
 

Kevin54

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Urbana, Ohio
Just a few words of advice about MDF and dust.

DO NOT BREATH IT :scared:

In '09, we were remodeling the house and I was cutting some MDF in the garage. Like a total *******, I had the doors open, but no air moving and I didn't have a particle mask on. When I was done cutting, I swept the floor, then took the leafblower and blowed out the rest of the garage. No problem.

A few days later, I developed a cough. Most of the time when I get a cold, I will develop a cough. This was one that absolutely would not go away. I called the doctor and they gave me something they called White Pearls. Some sort of antibiotic I guess. The cough was getting worse and had developed into a cough that once it got started, you would cough what seemed like 30 minutes non-stop. So I called the doc again, went to see her and she gave me a big shot in the *** of steroids and sent me to the hospital for X-Rays.

To shorten the story way down, the X-Ray showed something on my lung, which resulted in me going to a specialist, which resulted in a Broncoscopy, numerous CT Scans, and a couple P.E.T. test, which finally resulted with me laying on the operating table for a needle biopsy and possibly having surgery to remove a third of my lung.

Two doctors, and three specialist all had come to the conclusion that I had a massive tumor on my lung that was cancerous.

Thank God the doc that was getting ready to do the needle biopsy and to possibly split me from stem to stern decided to do ONE MORE CT Scan.

6 months of doctors, using all of my vacation up at work, numerous test and scans, and there was nothing. Absolutely nothing. I had developed pneumonia, or to put it a different way, I had developed a lung infection from breathing in the MDF dust. Not only was not wearing a dust mask a stupid move on my part (and some of you out there have done the same thing) it also cost me lost time at work, used all of my vacation, spent a few thousand dollars out of my pocket, cost the insurance a whole lot of thousands of dollars, and basically took away 6 months of my life thinking I had the Big "C". A $.25 mask would have prevented the whole thing.

So any of you guys out there messing with MDF, make sure you use at least some cheap precautions against breathing in the particles. :thumbup:
 

Daedalus

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^^Ouch! I have the dust collector and an overhead air filtration system. I'll wear a dust mask if I make more than a few cuts. If it's just a couple quick cuts, no.

I have had noticeable static issues a couple times. Dust clings to the outside of the dust deputy and to the flex hose. I did buy a wire to ground it, but haven't gotten around to installing it. The wire needs to be wrapped around the pipe to be in good contact with the plastic. Not coiled too tightly, the charge will find it's way. It is known that explosions can occur, similar to grain silos or flour dust explosions.
 

Tim The Tool Man

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Mar 1, 2012
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Lehigh Valley, PA
i seen the thien seperator . the only thing that it doesnt really say is how far the bottom piece should be from the elbow

I'm posting a few more pics to help explain the inner workings of my Thein prefilter... (yes that shiny thing is a light. I mounted a light under the lid so I could watch the collector when it is running to see how well it works.)

I don't mean to hijack this thread but it's relative.

Do any of you guys run a ground wire through your dust collection system? I currently do not have my system grounded but do not have any problem with static charge and I'm not sure why. I keep my shop at 60 degrees in the winter with electric heat and the humidity is around 25%.

The system is flexible hose from a tablesaw, router table, miter saw and belt sander, all connected to a 15' long 4" pvc manifold which is connected to the dust collector with another short section of flexible hose.

It seems like I should have a problem but for some unknown reason I don't. I'm thinking that I should run a bare copper wire through the 15' pvc and connect it to my grounded metal conduit.

Opinions?

I have done a lot of research on this topic and I can say with confidence that you will not have any static issues with a home workshop dust collection system plumbed with 4" PVC pipe. In an industrial setting where the volume and pipe diameters are far greater static is a real concern.
 

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Angelfire

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Mar 22, 2012
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New Mexico and Ireland
There are really two reasons you may want to ground a dc system. One, if you're concerned about the possibility of explosion. Personally I haven't bought into the theory and I haven't seen any documentation of someone's home shop being leveled due to the ducts exploding. There's a ton of research that says its just not gonna happen. Two, if you are getting static shocks and want to try to eliminate them. Personally, I don't plan to add one only for the worry that I'd worry about stuff hanging up inside the pipe on the wire.
 
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pedroghne

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Mar 10, 2013
Messages
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will the pre made separator lids for ok with mdf or should I just go ahead and build a thein separator. also it will be used with the hf dust collector
 
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