Dust Collector Motor Replacement

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Forum topic by mainelysam posted 06-24-2012 01:54 PM 3723 views 0 times favorited 5 replies Add to Favorites Watch
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8 posts in 2284 days

06-24-2012 01:54 PM

About a year ago now I picked up an old dust collector from a crazy old fellow who had been storing it in a warehouse of odds and ends. He said it used to be in a shoe factory, and came with a wonderful reusable felt bag. The one thing I’m not a huge fan about thus far is that it’s a tad underpowered. It has a 1/3hp motor, but it’s turning at 3400rpm. I have a 1.5hp motor that I might be able to mount to the blower, but it turns at the same rpm. My question is, will I have more suction with a bigger motor turning at the same rpm?

5 replies so far

View Sawkerf's profile


1730 posts in 3064 days

#1 posted 06-24-2012 01:57 PM

Probably not. The air flow is created by the impeller (fan). Unless the impeller speed increases, you won’t see any air flow increase.

-- Adversity doesn't build reveals it.

View mainelysam's profile


8 posts in 2284 days

#2 posted 06-24-2012 02:33 PM

Yeah, that’s what I figured. Thanks anyway.

View Paul Stoops's profile

Paul Stoops

348 posts in 2556 days

#3 posted 06-27-2012 07:03 PM

As Sawkerf said, the airflow won’t increase by going to a larger motor. The problem is the diameter and design of the fan impeller. Most DC’s suitable for woodworking have fan impellers at least 12” in diameter with a minimum of 1 1/2 HP and 3450 RPM. I would guess that your 1/3 HP unit has a much smaller impeller.

-- Paul, Auburn, WA

View Mainiac Matt 's profile

Mainiac Matt

8034 posts in 2324 days

#4 posted 06-27-2012 07:31 PM

You can put more than one blower in a system….

For example, you can put use a seperate blower as a booster next to a machine that has an especially heavy load (i.e. a big planer). Or you can simply put two blowers in series feeding into cyclone and then a bank of bags or filters

So I’d recommend hanging on to that unit and coming up with a plan that incorporates it with a second blower some day.

-- It’s the knowledge in your head, skill in your hands and motivation to create in you heart that makes you a woodworker. - Mainiac Matt

View djg's profile


160 posts in 2157 days

#5 posted 06-27-2012 07:38 PM

What is the inlet diameter? The only reason I ask is: typical 1 HP dust collectors have an impeller that is around 9-10”. The 1/3 HP would be able to turn an impeller of this diameter if the system is air starved ie the inlet is less than 4”. If the impeller is around 10” you could add the 1.5HP motor and open the inlet size to 4”. It will at least get you started in ever continuing journey of dust collection! Keep in mind that the felt bags are real dust pumps and inherently allow particulate matter through in order to increase air flow. Most good bags are good down to 1 micron which means the nasty stuff gets through even after the bags are seasoned (which takes a long time.) But filtering down to 1 micron is better than nothing at all. Have fun on your journey…it’s a wild one.

-- DJG

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