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Dust collection system

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Blog entry by RussellAP posted 03-05-2012 03:37 AM 3635 reads 0 times favorited 9 comments Add to Favorites Watch

After sanding today, I have dust everywhere. I wore a mask, but I still feel like I inhaled a lot of dust. From now on I’m taking the sanding outside, but I’m also going to build me a dust collection system. The main culprit is the miter saw and that’s not to hard to collect, next is the router, then the TS.

I plan on using a washer motor I have new in a box. I’m going to mount this to a pulley system and gear it up to run at 8000 rpm to a massive squirrel cage impeller enclosed in a box which will vent outdoors via a 10 inch pipe.

The collection system will require that my shop is up and running and everything has to stay put, so it may be a while before I get the feng shui to a desired point.

The collection pipe will be 6” diameter run from the ceiling to each tool station where it will curve to the back of the tool in an out of the way spot where three 4” flex tubes can be used for each tool. One on the dust collection port, one to suck the surface and another to grab the dust around the operator, between the operator and the source of the dust.

I don’t know the math but it should move a ton of air. I don’t worry about the amp draw on the motor because using the proper diameter of hose with curved pipe will minimize the restrictions to the flow.

I have two garage doors that will remain open while working too. The pipe will just go out the door on the floor and around the corner so wind won’t bring the dust back in. It will be colder in winter, but I’ll use radiant heat to solve that problem.

Any thoughts.

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



9 comments so far

View OverkillBill's profile

OverkillBill

4 posts in 1018 days


#1 posted 03-05-2012 04:32 AM

Sounds good. Can’t get enough good air.
I’m working on mine presently also. 4” sound good. what DC (or vac)you using?

-- Big in Japan

View RussellAP's profile

RussellAP

2966 posts in 1030 days


#2 posted 03-05-2012 04:37 AM

I’m not using a vac, I’m making one from a squirrel cage impeller encased in a wooden sealed housing. It will be a two foot box of heavy plywood. The impeller will be about 12 inch diameter and about 10 inches tall. The enclosure will be sealed with an input of a 6 inch PVC and an output of a 10 inch diameter metal pipe. There is no dust collection per se, rather it will move the dust outdoors. There will be a bucket just before the input of the 6” pipe to let the large chips settle and that enclosure will have some baffling to allow for the pieces to drop into the collector bucket. It should only be large chips though because the air will be moving very fast.

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

View a1Jim's profile

a1Jim

112805 posts in 2321 days


#3 posted 03-05-2012 04:47 AM

Depending where your putting the motor you have to be careful with dust around motors they can cause and explosion.
If you interested in a inexpensive dust collector Harbor freight usually has them on sale for $150 I’ve used them for years and there a super bargain. There are not to many things I recommend from HF but the 2hp Dc is one of them .
I have one of mine to vent out side it sure cuts back on the dust inside and the noise too.

-- http://artisticwoodstudio.com Custom furniture

View RussellAP's profile

RussellAP

2966 posts in 1030 days


#4 posted 03-05-2012 04:52 AM

Jim, I’ve read a lot of material on pre-made DC’s and most of them fail the test of super fine particles. They simply don’t move enough air. I just found a furnace motor with the impeller and housing, brand new for $200 on craigs list. I will move the motor out of the impeller and put it on a step up pulley system so the motor won’t be anywhere near the dust. I can seal it with rubber and use a good air sealant around the joints of my box. The PVC will be glued so no leaks and the whole thing will sit by the garage door close to the floor so the exit pipe is short. It should be nice and quiet and move lots of air.

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

View a1Jim's profile

a1Jim

112805 posts in 2321 days


#5 posted 03-05-2012 05:02 AM

I don’t know what tests show but I’ve used HF dust collectors for 12 years and they have done the job for me and it’s less money than your furnace motor.When you read post about DC on LJs many folks recomend the HF. If the blower motor is what you already have go for it.

-- http://artisticwoodstudio.com Custom furniture

View kizerpea's profile

kizerpea

746 posts in 1111 days


#6 posted 03-05-2012 01:12 PM

I think you are barking up the wrong tree….furnace blowers are for forced air applications. it will not work like u expect it to…if sanding dust is ur consern build a down draft table..forced air blowers push air, radial drive blowers suck air. do a little homework…...if you still want to build it that way..have at it…an good luck

-- IF YOUR NOT MAKING DUST...YOU ARE COLLECTING IT! SOUTH CAROLINA.

View mondak's profile

mondak

62 posts in 1144 days


#7 posted 03-05-2012 01:58 PM

I am no a fan of HF products, but if their 2hp DC is good like A1jim says, i would get one….....or another brand. I would also do as kizerpea suggests….....build a downdraft table around your blower, with plenty of filter area.
I built a down draft table as a part of my outfeed for my table saw. Mine has 2….20×24 (or 40”x24”) furnace filters, and they are each stacked 3 deep. I think the 2 top filters are 8 merv and the bottom filter is 12 merv.
When the sun is shinning just right in my shop window, and the dust bunnies are visably floating….....10 minutes with the downdarft running will clear the air. So….if I keep it running…....floating dust don’t stand a chance.

View ShaneA's profile

ShaneA

5444 posts in 1342 days


#8 posted 03-05-2012 04:19 PM

Russ, +1 on Jim, add a filter to it, and you are good.

View RussellAP's profile

RussellAP

2966 posts in 1030 days


#9 posted 03-05-2012 05:39 PM

I think I’ll just do the sanding outside, that way I can get a store bought DC and not worry about it. I’ll wear a respirator if I can find one that doesn’t suffocate me.

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

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