HF DC update

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Forum topic by MrRon posted 05-25-2014 04:22 PM 1392 views 0 times favorited 11 replies Add to Favorites Watch
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5260 posts in 3478 days

05-25-2014 04:22 PM

I have my 2 hp HF DC up and running after much thought. I did away with everything except for the motor and fan. I made it into a 2 stage system and direct the fine dust out of the shop. No filters, no back pressure. I have it hooked up only to my saw right now and it is extracting 100% of the dust as far as I can tell. I made a manifold that I will be incorporating into the DC intake so I can extend my dust collection capability throughout my shop. This is surely the most economical and positive way to expel dust if discharging dust directly to the outdoors is permitted. The dust being expelled disburses quickly into the air. There are no buildups of dust anywhere. If this was an industrial setting, that would be a different story. My DC runs only when the saw is running which is no more than a few seconds; maybe a minute at the most.

11 replies so far

View exelectrician's profile


2328 posts in 2661 days

#1 posted 05-27-2014 06:16 AM

I agree filters do one thing only, the finer the filter, the finer the dust in the air you breathe!
Put it (the fine dust) outside and you breathe no dust, this is a no brainer to me.

-- Love thy neighbour as thyself

View Kurty's profile


10 posts in 1780 days

#2 posted 05-27-2014 06:34 AM

I have been nothing but frustrated with my HF DC. I bought a Wynn Canister filter (.5 microns) and it made a significant improvement. But, the everything on this DC has leaks. I was adding more silicone around the impeller housing 2 hrs ago. its been a huge disappointment.

View ducky911's profile


237 posts in 3023 days

#3 posted 05-27-2014 02:39 PM

I been wanting to do something like this, mine is in a small plastic shed just outside my shop. Did you get much of a increase in flow. I worry that the motor might need the back pressure , seems like someone on here had a warning about that. I do let mine run longer as I have it hooked up to many machines.


View b2rtch's profile


4868 posts in 3282 days

#4 posted 05-27-2014 02:52 PM

” its been a huge disappointment.”
this is the very first time that I hear anyone saying this about the HF DC.

To vent the air outside is the best solution when possible but most people cannot do that.
I have neighbors all around ,they would not put up with my dust.
You have to be careful to not vent where some of your family members could be and then breath the fine dust.

Also you are limited and time and by the power of your Dc.
I have a 5HP DC which would suck out the whole warmed or cooled air out of my shop in seconds, I could not afford that.
In addition I have a wood stove and the DC vented outside create such a depression in the shop that the shop is filled with smoke faster than I can say it.
So venting outside is not always possible or the best solution.

-- Bert

View ohtimberwolf's profile


881 posts in 2586 days

#5 posted 05-27-2014 09:52 PM

A lot of good point there Bert. Shows that all views are important. larry

-- Just a barn cat, now gone to cat heaven.

View ColonelTravis's profile


1951 posts in 2128 days

#6 posted 05-27-2014 10:24 PM

When you all direct the dust outside, how exactly is this done?

View MrRon's profile


5260 posts in 3478 days

#7 posted 05-28-2014 06:53 PM

ducky911, A DC running with or without a load won’t harm the motor at all. It’s when you block off all inlets when you can overheat the motor and cause damage to the system

Colonel, You run a duct from the outlet of the blower (fan) through a wall to the outdoors. The inlet can be directly from the machine or from a separator drum. You put an elbow on the end of the duct, to direct the dust and to keep rain out. A screen is also a good idea to keep birds from nesting inside the pipe.

b2rtch, I don’t have a heat loss problem down here in south Ms. and my closest neighbor is 500 feet away.

View CoachSchroeder's profile


97 posts in 1838 days

#8 posted 05-28-2014 07:03 PM

I live in one of those developments that was a farm field 15 years ago.
My garage window faces my neighbors garage window, maybe 20 feet away at most.
I picked up a HFDC last week.
I’m going to base my set up on Jay Bates’, vent outside and see what happens. I plan to use the garage window rather than cut a hole in the wall.

-- -Sam, in Wisconsin

View Gene Howe's profile (online now)

Gene Howe

11135 posts in 3663 days

#9 posted 05-28-2014 09:35 PM

For those who worry about close neighbors, I’d think one of the bags from the DC, attached to the vent pipe, would suffice.
One could go whole hog and build a little sloped roof hut to enclose the vent and bag. Heck, with the hut, you could just vent it into an open trash can.

With my separator, the dust through the vent is negligible, anyway.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2183 days

#10 posted 05-28-2014 11:48 PM

MrRon you are dead wrong. “It’s when you block off all inlets when you can overheat the motor and cause damage to the system”

A material handling impeller draws less amps with the inlet blocked. The incoming air can speed the up the impeller. By increasing the intake size you increase the amount of air it can draw, therefore increase the speed of the motor, and causing damage to the motor. My neighbor used to rebuild motors at work. He told me they had a piece of plywood with handles to cover the hole in the housing. When they start a large blower they cover it and as it is running they slowly slide it back so introduce more air flow. carefully watching the amp draw so not to over speed the motor.

When I built my cyclone I size my intake to maximize my airflow, without letting my motor draw more amps than it safely can. I had an 8” hole in the housing, and I had doughnuts to size it down reading the amp draw. I ended up at 6” and even that was too big, but when I added the resistance of the cyclone and pipe it put me right in the safe zone.

View CoachSchroeder's profile


97 posts in 1838 days

#11 posted 05-29-2014 04:23 AM

Gene- that’s what I’m thinking too. I’ll probably run a length of pvc down into the rock bed below the window. If it spills out of the rocks into the grass I’m sure I mow often enough to disperse it.
Last thing I’m worried about (someone mentioned it in a different but similar forum thread) is that it might be loud. I do most of my work at night.

I guess I’ll find out!

-- -Sam, in Wisconsin

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