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Questions about Harbor Fright Dust Collection System

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Forum topic by MLK posted 04-10-2020 12:52 AM 408 views 0 times favorited 6 replies Add to Favorites Watch
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MLK

104 posts in 4542 days


04-10-2020 12:52 AM

I have a Harbor Freight Dust Collector that I bought about 6 months ago I have a few issues with it that maybe one of you of could shed some light on for me.

1: When I put the collection bag on the OD of the drum the bag is to big and I have to fold the bag so I can clamp it. When you turn the system on it blows sawdust out were the folds, I bought new bags from Amazon but had the same problem I put duct tap over the folds and it stop the leaking. but there must be a better way.

2: I ran clear flexible tubing to all the machines with blast gates at each machine the problem I have is the Gates at my table saw and thickens planer keep getting block with wood chips and wont close all the way so I’m constantly cleaning them would metal gates work better.:

3: I keep reading that dust collection system should be grounded is this true on a system with clear flexible tubing if so how would you go about it and what is the advantage of it?.

4: When saw dust pass through the flexible tubing some sawdust gets trapped in the spiral winding of the tubing is this normal?


6 replies so far

View jamsomito's profile

jamsomito

542 posts in 1157 days


#1 posted 04-10-2020 01:19 AM

I have the same DC and some of the same problems.

1. Even if the bag fit perfectly it’s still going to blow dust out from around that strap clamp, especially where the clamp mechanism is. I put some thin weather stripping around that fixed some of the issue. It’s not going to be great with the bag in general though. If you really care about leaks I think converting to some kind of cyclone or Thein Baffle is the way to go.

2. I move a single hose around, but I’ve heard the right blast gates make all the difference. When I do move to hard ducting and blast gates, I had the metal ones in mind.

3. It does build up some static, but not enough to cause a fire or explosion or anything. I just leave it ungrounded.

4. With this collector, yes. It doesn’t move a ton of air, relatively speaking. You could do the impeller mod, use a shorter run of hose, make sure there are as little bends or kinks as possible, make sure the filter bag is clean, etc. All of these will improve airflow.

With some TLC this collector can be good. Good luck.

View MLK's profile

MLK

104 posts in 4542 days


#2 posted 04-10-2020 02:01 AM

Jamsomito Thanks very much for your impute, the duct tape over the folds and clamp works well just wasn’t sure that I was doing it right. It sounds like the problems I’m having might be common to this dust collector.
Have a happy and safe Easter.

View AndyJ1s's profile

AndyJ1s

300 posts in 486 days


#3 posted 04-10-2020 02:24 AM

If you are seeing dust trapped in the flex hose (not at fittings, etc.) that is not good at all. It means your air velocity in the hose is below the carrying velocity. How long are your runs in which you see the sawdust trapped? What diameter is the ducting?

You didn’t mention the size or features of the collector. From your description, is the bag you are dealing with the collection bag, or the filter bag? If collection, what kind of filter does it have, a bag, or a cartridge? Is there any separator (cyclone, etc.)? Without a separator, the filter (bag or cartridge will clog relatively quickly, which then kills airflow, which then leads to the sawdust getting trapped in the hose. What HP is your blower motor?

If you filter is simply clogged, then cleaning the filter should alleviate the dust getting stuck in the ducting. If not, then you need a bigger dust collector, or much shorter duct runs to your equipment.

Your collector blower may not have enough throughput to handle the additional load of a separator (with your current ductwork), especially if it still leaves dust in the ductwork with a clean filter.

-- Andy - Arlington TX

View Fred Hargis's profile

Fred Hargis

6169 posts in 3224 days


#4 posted 04-10-2020 10:39 AM

I would get some closed cell weather stripping, some EPDM stuff would be good, and put it completely around the drum. Then fit the bag over it. The weather strip will increase the diameter of the drum as well as help to seal once the bag is clamped down. The stripping may not be as wide as you want, so it might take 2 wraps next to each pother to give you sufficient sealing.

-- Our village hasn't lost it's idiot, he was elected to congress.

View clagwell's profile

clagwell

204 posts in 523 days


#5 posted 04-10-2020 12:10 PM

1: When I put the collection bag on the OD of the drum the bag is to big and I have to fold the bag so I can clamp it. When you turn the system on it blows sawdust out were the folds, I bought new bags from Amazon but had the same problem I put duct tap over the folds and it stop the leaking. but there must be a better way.


As Fred said, the weatherstripping makes a big difference. Also, the Bags from Wynn Environmental are a tighter fit.

2: I ran clear flexible tubing to all the machines with blast gates at each machine the problem I have is the Gates at my table saw and thickens planer keep getting block with wood chips and wont close all the way so I’m constantly cleaning them would metal gates work better.:

You can buy or make self cleaning gates to elimnate that problem.

3: I keep reading that dust collection system should be grounded is this true on a system with clear flexible tubing if so how would you go about it and what is the advantage of it?.

If the spiral winding on your hose is metal then you can ground that. As a general rule it’s a good idea to ground any touchable bare metal surface that’s close to the hose to avoid potentially nasty shocks. If you’re not having any issues with static discharges now then there’s no need to mess with it.

4: When saw dust pass through the flexible tubing some sawdust gets trapped in the spiral winding of the tubing is this normal?

Yes, that’s normal. There’s stagnant air in those grooves and the dust simply drops out there. Think about the aftermath of a blizzard or dust storm. The lee sides of everything are filled with drifts. That’s just the way air flows over obstructions.

-- Dave, Tippecanoe County, IN --- Is there a corollary to Beranek.s Law that applies to dust collection?

View tvrgeek's profile

tvrgeek

941 posts in 2380 days


#6 posted 04-10-2020 12:44 PM

First of all, if using canvas bags, you don’t have a dust collector, you have a chip collector. All the fine dust that KILLS you is left in the air. So convert to a canister and plastic bag.

Stumpy Nubs shows an easy way to add grounds on plastic tubing, but also comments there are no actual documented cases of dust explosions in a small shop system. The density of the dust is just not high enough.

Mount your gates upside down so dust does not get trapped in the far end. My 4 inches are “through” gates so they do not clog. My 2 1//2 are a real pain as they do. I’m in the process of re-piping.

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