thien or cyclone

[siggy_7]

Yes it does explain that. I should say though that I looked into it after my post and stupidly realised that by the formulae in that document pressure drop is a function of the inlet and outlet diameter, affecting the Euler number by cyclone diameter alone doesn't come into it. To get a sensible pressure drop with your stated flow rate you would need 9" inlet and outlet diameters!

I would say that your estimated flow rates are very high, particularity for a 3hp extractor. Bill Pentz's target flow rate is about half that flow (albeit using a cyclone with a relatively high 6.5" water pressure drop). I would reckon on sticking with the 6" inlet and outlet and a diameter at least 3x and probably approaching 4x the outlet diameter. Also if you cash transition to a tall, thin rectangular inlet with a slightly downward angle I would imagine that would help greatly.

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[MikeK]

Outer Diameter 54cm
Inner diameter 34cm
Internal Height 16.5cm

I am new to the Thien baffle, but from everything I've read and seen so far, the inlet for the dust and chips has to be after the end of the slot instead of at the beginning of the slot. This gives the stuff enough time to ride around the perimeter and lose a bit of velocity so it can drop into the can. Based on what I see, it appears your inlet should be rotated about 120 degrees counterclockwise.

Have you noticed any material making its way into the filter?