LumberJocks

Dust collector -why is bag so tall

  • Advertise with us

« back to Designing Woodworking Projects forum

Forum topic by Fuzzybearz posted 03-19-2018 12:44 PM 1126 views 0 times favorited 26 replies Add to Favorites Watch
View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


03-19-2018 12:44 PM

Hello

I have a powermatic 3hp dust collector much like the one shown here.

Im having trouble finding a resin shed like one from rubbermaid to fit these dimensions in the area I need. I eas wondering if I could block one port to not use 1 of 2 bags and if I could make the upper dust collection bag shorter?

Why is the upper bag so tall anyways?


26 replies so far

View RobHannon's profile

RobHannon

270 posts in 945 days


#1 posted 03-19-2018 01:03 PM

It will impact the efficiency. You need that open surface area on the exhaust side to allow for the suction at the tool. You could switch to something with more surface area in a smaller package like a pleated filter. Wynn Environmental sells some or you could look at air filters for tractor trailers from Donaldson/Torit. The rig air filters come in lots of different sizes and have very similar specs to those for dust collectors.

View eflanders's profile

eflanders

326 posts in 2265 days


#2 posted 03-19-2018 01:19 PM

As Rob said going to a pleated air filter will help with the height issue but also improve the air dust filtration. If you get a Donaldson filter it is even shorter and far less expensive than the Wynn. It is a very worthwhile investment!

View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


#3 posted 03-19-2018 01:35 PM

Interesting. Ill look into the filter, im not worried about microns as itll be set outside in a shed but I noticed on Bill pentz calculator that 30 micron bags create more sp loss.

Anyways, what if I were to cap off one of the bags at the wye? Id save alot of space and need a smaller shade. Would anything improve or decrease as a result?

View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


#4 posted 03-19-2018 01:37 PM

The donaldson….im seeing industrial sizes. Is there anything smaller? Or a link you were thinking?

View RobHannon's profile

RobHannon

270 posts in 945 days


#5 posted 03-19-2018 01:40 PM

I think you would want to block it off inside the impeller house so there is a smooth airflow path. Hard to say for sure without seeing a good picture of how that housing is shaped and how is splits off to the 2 bags. If you do alter it I would make sure it is reversible in case it doesn’t work well or you end up with more space down the road.

View RobHannon's profile

RobHannon

270 posts in 945 days


#6 posted 03-19-2018 01:50 PM



The donaldson….im seeing industrial sizes. Is there anything smaller? Or a link you were thinking?

- Fuzzybearz

They make airfilters for lots of different markets. The truck air filters are probably the most economical and size appropriate. I got mine form FindItParts.com, part #P181038. P181099 is also sometimes used on the 2hp HF dust collector.

https://www.finditparts.com/search?cid=131&mid%5B%5D=218

View WhyMe's profile

WhyMe

1159 posts in 1976 days


#7 posted 03-19-2018 01:55 PM

To have such a nice dust collector and shut off one of the outputs is a sin. You will be killing the suction. I’ll take your Powermatic and give you my Harbor Freight if you need to save space.

View Kelly's profile

Kelly

2335 posts in 3359 days


#8 posted 03-19-2018 03:51 PM

I have two like yours and I agree with others who indicate it would be a mistake to close one of the bags off. If you did, you might as well have gone to a smaller collector.

As to the type of bags you use, you’ve a few choices:

1) One of my two has the pleated filter and the other has the bags. You gain a little head space with the cans, but, probably, not enough to fit it into your shed.

2) You can have custom bags made that touch each other. As it is, you have a lot of space between the two. If you install wider ones (e.g., 20” for the part which attaches to the collector, but, say, 30” for the exhaust area), you can shorten both bags a lot.

3) You can build a 2’ wall to set your hut on, which could actually improve its looks.

View Loren's profile

Loren

10477 posts in 4063 days


#9 posted 03-19-2018 03:59 PM

Makers have started shipping them with
taller upper bags in recent years. I’m
sure they’re superior but a shorter bag
would probably work okay, especially if
you’re not using plastic bags on the bottom.

You can get custom bags with more surface
area and less height by ballooning out wider.

View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


#10 posted 03-19-2018 07:27 PM

So DC with only one bag at same machine specs have less suction than one with two?


To have such a nice dust collector and shut off one of the outputs is a sin. You will be killing the suction. I ll take your Powermatic and give you my Harbor Freight if you need to save space.

- WhyMe


View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


#11 posted 03-19-2018 07:30 PM

Any chance you can throw out some custom bag makers? Cant I also reduce the bottom bags and go wide so I can shorten that end too?

Also im not understanding your 2’ wall to set the hut on. Are you telling me to build flooring 2’ high and aet the DC on it?

I agree with everyone and probably shouldve gone with a single, but as it stands I have this two. Im debating on selling this one and switching to a cyclone thatll sit outdoors with no required shed. I would just need diametwr lightly larger than the 55gallon drum it would sit on


I have two like yours and I agree with others who indicate it would be a mistake to close one of the bags off. If you did, you might as well have gone to a smaller collector.

As to the type of bags you use, you ve a few choices:

1) One of my two has the pleated filter and the other has the bags. You gain a little head space with the cans, but, probably, not enough to fit it into your shed.

2) You can have custom bags made that touch each other. As it is, you have a lot of space between the two. If you install wider ones (e.g., 20” for the part which attaches to the collector, but, say, 30” for the exhaust area), you can shorten both bags a lot.

3) You can build a 2 wall to set your hut on, which could actually improve its looks.

- Kelly


View d38's profile

d38

126 posts in 677 days


#12 posted 03-19-2018 08:05 PM

https://americanfabricfilter.com/filter-bags/
Makes custom bags to any size. Measure the diameter of the attaching point, decide length and diameter, and give them a call. The nice ladies who answer the phone will help you out.
I had them make a bag for my Grizzley 2 hp model, and it goes to the ceiling which is 10’ tall.

Agree with others – your DC needs 2 bags/filters. With only 1, it can’t get rid of air, so will reduce its suction.

View Kelly's profile

Kelly

2335 posts in 3359 days


#13 posted 03-19-2018 11:07 PM

First of all, when you’re set up, you’ll be glad you went with the two. In the last ten years, I’ve had seven collectors. Currently, I have three in my shop. The small one, coupled with my Super Dust Deputy, doubles as my lawn vac (pine cones, etc.).

If they weren’t monsters and insistent on 220, I’d drag the big ones into the yard. Meanwhile, their performance superiority over the little two horse and one and a half horse units it obvious. None of the little ones would deal well with my sanding table or the two ports on my table saw, for example.

As to the shed, I could have been more clear – I was talking about raising it up (e.g., 2’) for head room.

I went back and tried to find the email of the companies that build bags, but must have put in a folder where I wouldn’t lose it. Just run a search for bags and you’ll get hits on companies that custom make them, like the d38 mentioned.

View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


#14 posted 03-21-2018 04:57 AM

Thanks for the help everyone. Ill be back with more questions later. Specifically if I did Bill Pentz calculations correctly!

View Fuzzybearz's profile

Fuzzybearz

104 posts in 484 days


#15 posted 04-05-2018 01:23 AM

Hey guys. I want to put a cyclone onto my powermatic. Would I simply turn the dust collector upside down into a cyclone like in the picture? If so what about the suction needed from the 2 side bags?

showing 1 through 15 of 26 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com