Reply
Apprentice Visitor
wood54cutter
Posts: 1
Registered: ‎02-16-2012
0

When to change top dust bag.

I have a craftsman dust collecting system (yes... I know... not the best) and I'm wondering how often do you change or replace the top dust bag. Also, is there a point where you can just put it into the wash to clean it up? Or does it destroy the function of the bag to much... Thanks.

Esteemed Advisor
fredhargis
Posts: 1,848
Registered: ‎10-23-2009
0

Re: When to change top dust bag.

I'm not sure what kind of bag that is. If it's a canvas 30 micron bag, the proper care may be different. But here's what I was told by AFF about their felt bags. They are "singed" on the inside (fuzz burnt off) so once the dust cake builds to a proper level for filtration, the rest simply falls into the bag after the system is turned off. Cleaning shouldn't be necassary, and washing was not recommended. That said, I still lcenaed mine once eayear or so but taking it outside and beating the snot out of it with a 4' long 3/4" dowel. Then I would run the shop vac over the interior surface. I did not ever wash it, however. That top bag lasted me for about 6 years with no problems, and was still on the DC (a Penn State 2 1/2HP model) when I sold it. The bottom bag did have to be replaced once due to physical damage.

"I long for the days when Coke was a cola, and a joint was a bad place to be" Merle Haggard
Honored Advisor
mathisonr1
Posts: 4,068
Registered: ‎11-07-2009
0

Re: When to change top dust bag.

Like Fred, I never wash mine, but I do shake it out, beat it out and vacuum it. As to when do you know that it needs replacement? When working properly, the bag should not puff up like a balloon. So if you can't get it clean enough, to not inflate, it's time to replace it. When that time comes for me, I will be replacing the bag with a cartridge type filter.

Rick Mathison
General Forums Host
"I believe that to have a friend, a man must be one."
Advisor
Rrandy
Posts: 1,626
Registered: ‎11-05-2009
0

Re: When to change top dust bag.

I have the Penn State 1 hp with the singed felt bags, 1 micron I think. Once the bag pops inflated it's time to clean for sure. I've just shook the bejabbers out of the top bag while still on the machine and then take both bags off, empty the bottom and then run the shop vac on the inside of both. They are not to be washed according to the manual and they are 10 years old but the cleanings are coming sooner than when new.

Never do anything you don't want to explain to the EMT.

Esteemed Advisor
john880
Posts: 3,938
Registered: ‎01-01-2010
0

Re: When to change top dust bag.

Dido on Randys post, I turn both of my two bag Penn 1 1/2 hp. system inside out, outside mind you,,,,," I've just shook the bejabbers out of,,,,.  (Well stated Randy)












TODAY IS THE OLDEST YOU'VE EVER BEEN,
YET AT THE SAME TIME, THE YOUNGEST YOU'LL EVER BE,,, SO MAKE THE BEST OF IT WHILE YOU CAN, AND ENJOY THIS DAY WHILE IT LASTS.

Senior Contributor
Ron P.
Posts: 295
Registered: ‎10-23-2009
0

Re: When to change top dust bag.

I have a Delta 50-760 dust collector I purchased August '05.  If I remember correctly, the top bag fills completely since day one.  I have taken it off and whaled the tar out of it twice.  I can't tell if the pressure on the bag changes.  It still stands proud.  Is this wrong?  Sure does collect a lot of dust and I don't see any dust leaks anywhere.  I seem to recall something about leaving the inner coating of the bag intact to inhance dust retention.

Honored Advisor
mathisonr1
Posts: 4,068
Registered: ‎11-07-2009
0

Re: When to change top dust bag.


Ron P. wrote:

I have a Delta 50-760 dust collector I purchased August '05.  If I remember correctly, the top bag fills completely since day one.  I have taken it off and whaled the tar out of it twice.  I can't tell if the pressure on the bag changes.  It still stands proud.  Is this wrong?  Sure does collect a lot of dust and I don't see any dust leaks anywhere.  I seem to recall something about leaving the inner coating of the bag intact to inhance dust retention.



If the top bag inflates completely it is restricting your air flow. Nothing may be coming through it, but it is also not allowing enough air through it. That Dust collector received very good grades in Wood Mags dust collector review, but if the factory bag puffs up like a balloon, I could only imagine how good it would be with a properly sized filter bag.

Rick Mathison
General Forums Host
"I believe that to have a friend, a man must be one."
Esteemed Advisor
fredhargis
Posts: 1,848
Registered: ‎10-23-2009
0

Re: When to change top dust bag.

[ Edited ]

mathisonr1 wrote:


If the top bag inflates completely it is restricting your air flow.


I don't think I'd agree with this..at least not totally. I know with my mine (a PSI DC250)even with the oversized AFF upper bag and the Wood cyclone it would fully inflate shortly after I cleaned it. The AFF fabric is made to allow the proper dust cake build for cpaturing particles, the the rest falls off. That "proper" cake allows the combination of best air flow with filtration. I'm guessing that if the bag isn't fully inflated it's not capturing all the finiest dust paticles. I suppose I could call AFF and get their opinion......but I know if I tried to keep my upper bag from inflating, I would have been cleaning it every other day. It's true you move more air when the bag isn't restricted, but most bags are designed to use the dust cake to help filter. In fact some guys will "season" their bags with a cup of flour (when new) juts to build a little cake up on the inside.

"I long for the days when Coke was a cola, and a joint was a bad place to be" Merle Haggard
Honored Advisor
mathisonr1
Posts: 4,068
Registered: ‎11-07-2009
0

Re: When to change top dust bag.

 Larger filters will increase the performance, in some cases significantly. Filters are rated in terms of resistance at a given air velocity. Increasing the filter area reduces the filter face velocity, which lowers the initial resistance, or pressure drop. Final dirty pressure drop remains the same, but the filter will hold more dust before reaching that point - meaning fewer cleanings. Finally, the efficiency of the filter to clean dust goes up as face velocity goes down. So this is a win-win situation: Lower pressure drops, longer time between cleanings, better filtration efficiency.

 

The above statement was taken from a question and answer article here on the Wood site.

Rick Mathison
General Forums Host
"I believe that to have a friend, a man must be one."
Esteemed Advisor
fredhargis
Posts: 1,848
Registered: ‎10-23-2009
0

Re: When to change top dust bag.

[ Edited ]

I don't think I said anything that disagreed with that info, I'm just saying that a fluffed up bag occurs when the proper dust cake has built and it is indeed "inflated". In fact, I suppose you could argue one thing the dust cake does is slow the face velocity for mximum filtration.  But a good quality bag that hasn't reached that state is not capturing the finest particles. Aff can tell you how much CFM each square foot of their fabric will filter at a given pressure...that's what allows them to size it to  specific collector.

"I long for the days when Coke was a cola, and a joint was a bad place to be" Merle Haggard

 

© Copyright 2009, Meredith Corporation. All Rights Reserved | Privacy Policy | By using this site, you agree to our Terms of Service.