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Discussion Starter · #1 ·
I googled the question and got cross eyed after reading the many posts. One guy had 1 DC before the separator and the other on the exhaust of the separator. He said he had good results however then the opposing points of view rolled in. Series-Parallel- increase trunk diameter remove 90 degree bends.... By the grace of God I will have 2 DC's a 1hp and a new 2hp arriving next week. It seemed ashamed to have the 1hp not doing anything. If I follow this guys system it would be a flexible 4" hose from the tool to the 1hp DC, a 4"flex outside to the separator and the 2hp DC sucking out the separator. Currently the 1hp DC is outside with the separator. Any experiences or thoughts?
 

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Belt and suspenders mentality. I suspect the first blower disturbs the sawdust in the chip seperator and pushes more sawdust into the second DC unit, likely clogging the filter bag much quicker. I'd never do that, even though I have a second DC blower around here somewhere. I have a Rockler fitted chip collector connectors on a 30 gallon fiber drum. But if I were doing it again, I'd have the large cyclone separator on top of a drum.

Here's a pix of my my DC gear, placed in a covered area between the shop shed and a small office shed. It forms a breezeway, is out of the rain and all the noise is outside. I'm thinking of putting the compressor out there too.
 

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I would think what Tom said applies. If you take the wand on a vacuum and point it at someone they won’t feel a thing. Hook it up to the exhaust side and it’s a whole different story. They’ll feel that 20 feet away.
 

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Equal pumps in series increases pressure...in parallel they increase volume. If they are CFM-rated the same...

There seems to be no advantage of pre-feeding the separator with the 1hp blower. All the fine filtering would be done at the output of the 2hp setup anyway.

Having both in the system in series would not increase the volume. You may potentially "starve" the 2hp by having the 1hp in the line...check the CFM for each to be sure...
 

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Verdict seems clear.

If you want to increase flow and you have a Harbor Freight unit, consider ordering a replacement impeller from Rikon. The part number is P60-200-22, but don't tell them it's for a Harbor Freight unit. I have read that there is a slight size difference and that you might have to enlarge the hole, and that it is a bit larger than the HF impeller, so you have to be careful putting it in place. It is metal vs the HF plastic. Someone here wrote about the increase in air flow. I think the cost was about $90.
 

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Discussion Starter · #10 ·
I imagine the CFM from the 2hp DC will be enough from basically one tool at a time with a short run of flex. I want to use the 1hp if it makes sense. Hate to see it not being used... even thought about making a monster overhead air filtration unit out of it. If I use it I'll probably follow Sticks suggestion of making 2 separate units.

The 2hp DC I originally bought and had to return a few years back as the wiring/Panel Box for the shop couldn't handle the 20 amps. That's how I ended up with the 1 hp DC. Recently had 3 20 amp circuit breakers added for the shop and a new Panel Box.
 

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Recently had 3 20 amp circuit breakers added for the shop and a new Panel Box.
I have the same electrical setup. My wife ordered a 60 amp sub panel installed to my shed. It actually feeds both my shop shed and my office shed, since I'm only in one at a time.

I have two Harbor Freight 2hp units, one in my garage, the other outside the shop as shown. I doubt seriously if they are actually 2hp. A 15 amp, 110v circuit can only produce 1.75 hp at best. I color coded my circuits so I can avoid overloading them. One for DC and LED lights, second for heater/AC, third for whatever tool is in operation. The HF units go on sale occasionally with an additional discount coupon. Both HF units cost me $162 each. The Wynn filter cost more than the DC unit, but hoses, connectors, fiber drum from ULine, cost that again. Both units have a 27 foot flex hose that goes only to one tool at a time. Works great.
 

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I imagine the CFM from the 2hp DC will be enough from basically one tool at a time with a short run of flex. I want to use the 1hp if it makes sense. Hate to see it not being used... even thought about making a monster overhead air filtration unit out of it. If I use it I'll probably follow Sticks suggestion of making 2 separate units.

The 2hp DC I originally bought and had to return a few years back as the wiring/Panel Box for the shop couldn't handle the 20 amps. That's how I ended up with the 1 hp DC. Recently had 3 20 amp circuit breakers added for the shop and a new Panel Box.
It could be used to clear up shop air if it’s final filtration is fine enough. Or it could be used as a portable unit to hook up to tools with no fixed location. At 1 hp it should be a 110 volt unit drawing only around 8 amps.
 
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