Dust Collection

Motors come in standard sizes & mounts. Get the NEMA # off it. Try grizzly.com or mcmaster.com for replacements.

M

-- Madmark - [email protected] Wiretreefarm.com

I know it is a brain melter, but look up Bill Pentz' dust collection research.

Generally speaking, the tiny diameter / small motor dust collectors aren’t going to do a tinkers hoot.

Your best low $$ option is to…

#1. Buy a used Harbor Freight 2HP Dust collector. Or a new one if you catch a sale / coupon. Don’t pay more than $100.00 for a used one. #2. Build an internal Thien Baffle for your Harbor Freight Dust Collector. #3. Select the Wynn 35A canister filter of your liking, form the least expensive (paper filter) to the most (nano filber). I went with the spun bond poly because it is washable.

The size of your ducting matters, a LOT. The HF DC will support 5” duct, if you can run 5” to the tool and neck down if you have to and get to a 4” port, do it. The idea is to have as much air flowing inside the system as possible. If you roll the DC from machine to machine, keep your hose SHORT.

-- Please like and subscribe to my YouTube Channel https://www.youtube.com/c/daves-workshop

Dc blowers are sized with as a motor impeller combo. I would do more research into the possible benefits before investing in a new motor.

The impeller in your unit is only going to move as much air as the exhaust will allow.

Fans have a huge range of capacity in terms of CFM as well as inches of pressure.
Generally speaking, the faster it spins, the more air it moves.
Also, as the volume and pressure goes up so does the horsepower required to spin it.
In fact, the power required changes by the square of the volume change and by the cube of the pressure change.

One other inconvenient fact. Manufacturers tend to run fans at the extreme limits of their ability to stay in one piece to get the most out of them as possible. So, increasing horsepower won’t do much without increasing the speed. Increasing the speed, if you don’t know what the limits of the equipment is, is a good way to see how good you are at dodging shrapnel when it flies apart.

Just saying.

Thanks for the comments. I will do more research before tearing the motor about.

-- Cy - Des Moines, IA

As an engineer who has worked with dust control systems for most of my professional career it really irks me to keep seeing folks recommend the Thien baffle as an upgrade for the HF dust collector. IT IS NOT. A simple drop out box, or expansion chamber, will work better, is easier to build, and will not use up as much of your available static pressure. A cyclone stage in front of that collector would not be an upgrade for the same reason. Will these devices capture dust before it gets to the filter? Yes, but at a high cost in terms of air flow from the source. And air flow at the source is the most important thing.

I’m not against Thien baffles. They are easier to build than cyclones and work almost as well unless you are trying to capture very very fine dust. But they are self contained systems, good for a system that is vented outside. Wouldn’t want to breathe the output.

Putting a higher HP motor on an impeller of a given size won’t achieve more airflow. Induction motors on dust collectors typically turn at 3400 rpm. If the impeller is bigger it will move more air but require more current (higher HP rating) to keep that RPM. A low HP motor will be paired with a small impeller since that’s what that motor can turn. If you put a higher HP motor on it it won’t turn any faster, it will just have more current carrying capacity than it needs to turn that small impeller. To get more airflow you need both a higher HP motor and a larger impeller.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

Putting a higher HP motor on an impeller of a given size won t achieve more airflow. Induction motors on dust collectors typically turn at 3400 rpm. If the impeller is bigger it will move more air but require more current (higher HP rating) to keep that RPM. A low HP motor will be paired with a small impeller since that s what that motor can turn. If you put a higher HP motor on it it won t turn any faster, it will just have more current carrying capacity than it needs to turn that small impeller. To get more airflow you need both a higher HP motor and a larger impeller.

- BobAnderton

What he said^^^^^. I see posts every once in a while about the larger motor, but it just ain’t gonna do anything except maybe let the motor work less hard.

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

Get the Harbor Freight 2HP dust collector and be done with it. It costs less than the motor installed in it and actually performs quite good.

Yeah, you’ll probably need a larger impeller as well.

-- http://bloodsweatsawdust.com

Just a comment about the HF 2 HP; there are some things to check if you’re thinking about that. The HF is not a 2 HP motor, it’s closer to 1.5HP. Most 1.5HP DCs have an 11” impeller, but the HF has one that’s closer to 10”, that may be what your Jet has. I’d also compare the filtration of your Jet (I’d guess it to be a 30 micron bag) to whatever the HF comes with. Point being, the HF may be an upgrade (or not) from where you’re at, but it might not be much. I did look for the Jet specs and found the online info to be, well, lacking in detail. I’m not beating up the HF, a lot of guys have it and are quite happy…just suggesting that from where you are, it may not be a real big difference.

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

Just a comment about the HF 2 HP; there are some things to check if you re thinking about that. The HF is not a 2 HP motor, it s closer to 1.5HP. Most 1.5HP DCs have an 11” impeller, but the HF has one that s closer to 10”
- Fred Hargis

My dust collector used to trigger 15A breakers one out of three starts until I upgraded to 20A. My 2HP Grizzly never ever triggered a 15A breaker even with a full dado set. I used the outlets interchangeably.

So unless HF motor has very bad efficiency factor I would argue that it is at lease as powerful as 2HP saw.

As for the impeller diameter it is not the only factor that dictates its performance. There is also width and the shape too.

As pointed out by others, motors vary in efficiency. My Unisaw runs a three horse, but idles along at about seven amps. The collector connected to it is also a three horse, but idles at fifteen amps. Some of that may be load, but some of it may be the motor quality too.

The foregoing aside, I just pulled a one horse Delta off my miter and replaced it with the HF “two horse.” We, normally, don’t run more than a horse and a half on a o120 circuit. That would be a lot of amps and reduced efficiency. That said, I note a HUGE difference in how much dust is collected, even with just a hose near the output of the miter. I can only imagine what it’d do with a five inch hose.

As an engineer who has worked with dust control systems for most of my professional career it really irks me to keep seeing folks recommend the Thien baffle as an upgrade for the HF dust collector. IT IS NOT. A simple drop out box, or expansion chamber, will work better, is easier to build, and will not use up as much of your available static pressure. A cyclone stage in front of that collector would not be an upgrade for the same reason. Will these devices capture dust before it gets to the filter? Yes, but at a high cost in terms of air flow from the source. And air flow at the source is the most important thing.

I m not against Thien baffles. They are easier to build than cyclones and work almost as well unless you are trying to capture very very fine dust. But they are self contained systems, good for a system that is vented outside. Wouldn t want to breathe the output.

- crank49

Do you have any plans or details on how to build this dropout box? I’m interested…....