J. Phil Thien's Projects

Never mind, I found where you had listed the part number, and a google search brought up multiple Grizzly models that impeller is used on.

One thing I noticed is that it is used on the G1028Z2.  Since that is listed as a 1-1/2 HP unit, it is interesting that your 2HP unit won't spin that impeller.

Just looking at the picture of the impellers.  Quite a difference in size there.  I am curious which Grizzly unit (model number) that impeller is for?

If I understand your question, I believe I have just completed a similar separator.

I built a "top hat" design with side entry.  The internal height is 6 inches, with an internal diameter of 17 inches.  The inlet and outlet are both four inch closet flanges (a four inch fitting designed to be placed in the floor of a bathroom for installing a toilet), and connected to this is a 4 inch by 2 inch fernco flexible coupling.  The 2 inch end fits a 2.5 inch shop-vac coupling.  The inlet area is designed so that the air is directed into a sort of slot area along the wall that is about 3 inches wide.  It currently sits on top of a 20 gallon trash can.

My plan for this unit was to use it now with the shop vac, but also be able to use it later with a real dust collector.  My hope was that 17 inches would be not too big for the vac, and not too small for the 4 inch dust collector I hope to get.

I just started using this unit yesterday.  So far there is about 3 gallon worth of sawdust in the bottom of the can.  When I took the lid off of the vac, I was able to find about a teaspoon worth of sawdust in the shop vac filter.

I just hope it will work this well if I upgrade to a real dust collector down the road.