Seeing as how the vanes are reversed on those two impellers, which direction does the motor turn? are the HF and Rikon motors reversed from one another?
Contributor
Seeing as how the vanes are reversed on those two impellers, which direction does the motor turn? are the HF and Rikon motors reversed from one another?
[OP]
Member
I called and tried to order the part, but Rikon requires the dust collector serial number for liability purposes. I suppose they did not ask when you ordered yours?Originally Posted by Kevin W Johnson
Last edited by Chris Padilla; 04-15-2013 at 6:09 PM.
Contributor
The blower housing would have to be reversed as well. Most larger ones allow for that. Kevin was that the case with yours? You can run a forward curved fan but not usually done in dust collection and this fan isn't designed for that. Dave
Member
No, I didn't have that problem when I ordered mine.
Member
So your saying Rikon is using an impeller that isn't designed for dust collection? I bet that's news to them.
Member
Incidentally, no that are not. The housings, motor, etc., are all excatly the same.
Contributor
Kevin, the Rikon unit is designed with a blower that runs the fan in a clockwise direction. Your original fan was designed to run CCW. If you didn't change anything you are running the Rikon backwards from what it is designed for. Dave
Member
Really? Funny, seeing as the HF unit runs CW.
Both the Rikon and HF units are CW in their rotation (as well as Shop Fox W1685, W1666), as determined by the positioning of the motor on the housing. Units such as the Jet DC-1100, DC-1200, Delta 50-850A, Powermatic PM1300, are CCW units.
Last edited by Kevin W Johnson; 05-31-2012 at 1:05 PM.
Contributor
Kevin, if your HF blower is a clockwise configuration running a forward inclined blade you really improved it when in effect you changed to the more proper BI configuration. I have never seen a DC run a FI fan and would be surprised if the others you mentioned used FI blades. They will likely run fans made in the same direction as Rikon. FI fans are meant for low rpm, high volume but low pressure applications while BI fans are medium volume at higher pressures which is why the diameter is larger. The HR unit may pull great CFM unrestricted but the flow will drop dramatically when restistance from pipes is added. Turns out you did absolutely the correct thing in swapping the impeller. The original one is not correct for the application IMO. Dave
Contributor
which is what I was getting at. I figured the HF one was wrong.
Contributor
John, you were way ahead of me. Didn't look closely enough at the pictures and it didn't occur that HF would spec that fan. Given that the attachment bolts are on the same side of the curve as a BI fan it seems like it should be run that way. Bracing and bolts are generally on the back side so as not to cause more turbulence in the flow. Dave
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5" is easily doable in metal duct, but "impossible" in PVC...which tends to only be available in even number sizes. I use a lot of 5" for drops in my system as they closely match the 120mm ports on my MiniMax tools.
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The most expensive tool is the one you buy "cheaply" and often...
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Based on your amp readings and the pictures of the impellors, something weird is going on. Assume the fan wheels are identical (one appears to be designed for CCW and the other for CW rotation, but ignore that for a moment, they are both the same "style/type"). Based on the diameter increase, 12/9.75, you would get an increase in flow of 86% (varies with the cube of diamter change). Consequently, the amp draw would also increase at least this much (I think more, but I can't remember the relationship). Your amp draw only increased 14%. Maybe the HF was terribly inefficient, especially if it was turning backwards as discussed previously.
Mike
Last edited by Michael W. Clark; 06-01-2012 at 1:15 PM.
Contributor
Michael, don't you think the bag restriction is at play here. The new impeller can only push so much air through the bag. I'm assuming no flex is attached to the inlet so pipe restrictions are not an issue. Have you ever seen an impeller run as a forward curve in a DC? Dave
Member
Good point, the system resistance overall will increase with the increase in flow (SP increases with the square of the flow change). I have never seen an FI wheel on a DC. In larger systems, you would see a radial or radial tip in this application due to the fan being on the dirty side of the collector. Usually BIs are only used after fabric filters. Radials and radial tip wheels are still used after cyclones. This looks more like a radial tip. I think its a mistake on HF's part or a QC problem. We are talking about HF, you can't expect 100% QC compliance and Cadillac quality at those prices. I would suspect that the likelyhood of them putting the wrong wheel on the wrong fan is highly possible/probable, but who knows.
Mike
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