Hi, i made a dust collector per the many instruction on Utube. It works good but when the vacuum is on and the picup hose ia attached to the collector there is a very loud whistle start to vacuum and it stops unplug the pickup hose from the collector and it stops. Any idea how I can stop this whistle thanks
The whistle is almost certainly an air leak, you'll need to find it and plug it up. That's often hard to do (finding it), try sealing all the joints with silcone caulk. You might find the leak by using some smoke, or if you have a downy feather move it around all the joints. It will show you where the leak is.
I have a Leaf vacuum,that does the same thing when I put my "home made " hose on it. You found the harmonic resonance flow/frequency of that hose. If you were to shorten the hose the sound would be higher pitch until you wouldn't hear it anymore. Same thing with lengthening the hose, the pitch would get lower until you didn't hear it anymore. Yes a leak could cause it by changing that frequency, kind of like a a flute or recorder.
Cyclones MUST be sealed or they lose efficiency. I use foam, such as would be used on a house exterior door, pipe tubes or whatever fits my need of the moment.
I keep incense in the shop to test for suction between the lids and cans. I find one, I adjust the seal.
While it's whistling have you pushed down around on the edge of the lid to see if the whistle stops?
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