Run DC motor upside down?

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Forum topic by Neville posted 09-20-2012 08:10 PM 1911 views 0 times favorited 19 replies Add to Favorites Watch
View Neville's profile


29 posts in 2473 days

09-20-2012 08:10 PM

Topic tags/keywords: dust collector

Hello folks,

I have a Canwood dust collector (similar to the one in the picture). To accommodate my pre-collector (a Thien separator in a garbage can) I would like to turn the motor and impeller upside down so the inlet points down rather than up as shown in the picture. That would allow me to place the pre-collector directly under the motor, saving a lot of space and making the pipe runs a lot shorter.

Any thoughts on whether this would cause any problems with the motor or impellor?

Thanks for any hints or thoughts!

-- Neville, Calgary AB

19 replies so far

View crank49's profile


4030 posts in 2970 days

#1 posted 09-20-2012 08:22 PM

It could, but it shouldn’t.
I would be more worried about a horizontal fan being rotated to vertical.
But, vertical is vertical as far as bearings are concerned.

View jmos's profile


827 posts in 2369 days

#2 posted 09-20-2012 08:30 PM

I agree with Crank, I think you should be fine.

-- John

View ChuckC's profile


828 posts in 2934 days

#3 posted 09-20-2012 08:40 PM

I rotated my HF DC 90 degrees, which I think would be worse, and it works fine.

View cstrang's profile


1832 posts in 3167 days

#4 posted 09-20-2012 08:44 PM

I think it should be fine, like Crank said “vertical is vertical as far as bearings are concerned.” I did the same with my Delta 50-760 not too long ago to have the inlet to towards the top so I could run my duct straight down into it and it works great.

-- A hammer dangling from a wall will bang and sound like work when the wind blows the right way.

View Neville's profile


29 posts in 2473 days

#5 posted 09-20-2012 09:27 PM

Thanks folks – I will give it a try and post here when done!

-- Neville, Calgary AB

View kizerpea's profile


774 posts in 2367 days

#6 posted 09-22-2012 12:38 PM

sure it will work!!!l look at the diy cyclone in wood magizne…a motor dont care where its at …its gona run…its got thrust bearings on both ends..


View rance's profile


4258 posts in 3160 days

#7 posted 09-22-2012 12:51 PM

It’ll be ok in the Northern hemisphere. If you take it below the equator though, it will run backwards due to the correllis effect. :(

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View CharlieM1958's profile


16274 posts in 4218 days

#8 posted 09-22-2012 01:17 PM

What Rance said. Plus, it will squeal to the tune of a cut from the Beatles White album.

-- Charlie M. "Woodworking - patience = firewood"

View Nicky's profile


695 posts in 4091 days

#9 posted 09-22-2012 02:17 PM

you may want to look at this…

-- Nicky

View WoodWorkWarrior's profile


46 posts in 2072 days

#10 posted 09-22-2012 02:38 PM

Sounds like a great idea. I might have to do this with mine.

One thought, if you flip the motor (which mechanically would work just fine), it looks as though you would also have to flip the exit separator that the bags attach to (unless you don’t hook it up quite the same as it came). Some of these separators have internal baffles to direct dust and material down into the lower bag. Flipping it would negate this action – but that might not really matter since you’re adding the chip separator before the blower.

-- Jason

View Howie's profile


2656 posts in 2922 days

#11 posted 09-23-2012 01:47 AM

Rance and Charlie…have you two been sniffing too much sawdust again?

-- Life is good.

View rance's profile


4258 posts in 3160 days

#12 posted 09-24-2012 01:56 PM

Yep, I sniff all the sawdust as I can. :)

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View Neville's profile


29 posts in 2473 days

#13 posted 10-16-2012 04:40 AM

You guys obviously know nothing about Coriolis forces in opposing hemispheres… when you go below the equator electricity (obviously) also changes direction so that the motor goes the other way and the Coriolis force… cough cough ahem…

Before I get too carried away, thanks for all the comments folks – my plans are being put in Sketchup and I will post back here when I have the new setup running. Nicky thanks for the link, that is pretty much what I want to do. Jason, you are right – I have to flip the exit separator as well – there is a small baffle in there but nothing functional in terms of directing dust, just slightly sloped downwards to help dust fall from the top (canister) to the bottom (bag). Not sure yet how I will handle this – will let you guys know how it works out!


-- Neville, Calgary AB

View exelectrician's profile


2327 posts in 2427 days

#14 posted 10-16-2012 05:16 AM

Neville – Go ahead and swap positions, post pictures and show the world the sky isin’t falling.

-- Love thy neighbour as thyself

View Tenfingers58's profile


96 posts in 2677 days

#15 posted 10-16-2012 05:34 AM


I have a dust collector similar to yours. The way I plan to hook it to the Thien Seperator when I get time to build it will be a section of flex hose bent in a 180 degree loop from the seperator to the inlet of the fan. That way when I empty the seperator I’m not lifting the seperator, fan and all.

showing 1 through 15 of 19 replies

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