Cheap dust collector review
What prompted me to buy this dust collector is that it was on sale for $150 at Busy Bee tools, and that I had a need for a shop vac to clean a large garage floor. While this isn't a shop vac, I figured I could use it as one, and then use it as a dust collector later. (Of course, you can also use a shop vac as a dust collector, but they are awfully loud.)
The hose was not included. I had to pay another $25 for that.
The dust collector comes with a "1 micron" filter bag. This bag is fairly effective at filtering out fine dust, and I found, as I used it more, its filtering effectiveness improved. This is quite normal for filters, as the larger pores in the bag get plugged up. But resistance to air flow also goes up as the filter is "seasoned".
There is a grid in front of the blower inlet. I think it's to keep debris that is too large from damaging the impeller. But that screen is rather unfortunate, because for long shavings like those from a thickness planer, the grid would plug up in no time. I guess a solution would have been to make the impeller more robust. Certainly, this one spins up a lot more quickly than my large dust collector, so the impeller is probably much lighter.
The motor says it's a "1 hp" motor, but I'm a bit sceptical of that claim because it also only draws 7.6 amperes. That is more consistent with a 3/4 hp motors, and I don't think this motor is that much more efficient than other motors. Maybe they used a similar sort of bogus horsepower rating like they do for shop vacs.
At any rate, $150 is a really good price for a 3/4 hp sealed motor. So my thinking is, if I need to buy a new motor, buying a cheap dust collector just for the motor may be a good option.
The dust collector came with four casters. There are four sets of mounting holes under the sheet metal base for mounting them, but the holes aren't as close to the edge as they could be, and they aren't even consistently placed. I was pretty sure the whole thing would be far too tippy with the wheels mounted where the holes are, so I made some outriggers for the base to mount the wheels to. No complaints about the casters themselves, they work quite well.
I measured the suction on this one, and it sucks a 17 cm column of water. My main dust collector will suck about 21 cm of water. So I figured, just for fun, lets see what happens if I let the two suck against each other. With both running, the big one won, deflating the small one.
That said, the big one also has a 4" (100 mm) hose hookup, and it only has a 3/4 hp motor. I'm guessing the small one is using a lot less than 1 hp of motor power, and the big one might have a more efficient impeller too.
My intention was to eventually use this dust collector with my homemade table saw, so I added a dust port to it. The flange from the hose slides in from the top, and when I don't have a dust collector hooked up, I can just slide a piece of wood in there to close it off.
I made a really wide vacuum cleaner nozzle for it to vacuum dust off a large workshop floor. You can also see my homemade table saw, simple table and my light stands in this photo. This is a large workshop building that used to be rented, and that I decided to set some tools up in. Unfortunately, it's a 45 minute drive from my home, so I probably won't be using it that much. So I don't want to invest a lot of time and money setting stuff up there.
After vacuuming the floor, I noticed this - the bag is just slightly larger than the cylinder, and I had the excess bag folded right where the clasp is. This let some air escape, and as you can see, quite a lot of dust came out there as well. With the dust constantly swirling around inside, even when you stop vacuuming, there is still plenty of dust stirred up to get blown out. The swirling dust, combined with leakage, is a major problem with a dust collector like this. I made a wooden cross shaped thing to put in the bag to try to stop the air from swirling too much towards the bottom of the bag, but it wasn't enough to get the dust to settle.
My thinking is, that a much better approach for a dust collector is to have the filter come before the blower. That way, the whole dust bag or box is under vacuum, so no dust leaks out. Also, the blower wouldn't need to have debris going through it, which would allow for a more efficient impeller design (material handling impellers are generally less efficient). But that would require a sturdy box to contain the vacuum. That would be more expensive to make, which is why most dust collectors use positive pressure for the dust container. But for a homemade dust collector, a plywood box doesn't add that much work or cost. It all gives me ideas for how to design a better dust collector!
Though far from ideal, at $150, it's still a pretty good deal. Not that much more expensive than a good shop vac, and those have their share of problems too.
John Heisz has had a very similar unit, purchased from General International, with similar issues. He recently re-built it to work differently: Rebuilding a Dust Collector
Measuring dust with a
Dylos air quality monitor
Jens Larsen's dust
Ryszard's dust collector build
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