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Topics - GregT

#1
I've read much of what's here, but OMG, there is so much!  I just have a few questions that I'm not sure about.  My intent is to keep my tiny shop neater.  The dust doesn't both me much (yet).

I want to build a Thien Baffle on a 55 gal poly barrel.  I will set it up for 4" for my old Craftsman 1 1/2 DC, but have adapters so I can connect my shop vac for sanding (ROS, Rigid Spindle). 

Will the same baffle set up work with 4" inlet/outlets if I just make adapters for 2 1/2" hose?  I keep seing 1 1/4" wide for the opening, but should it be bigger for 4"?  If so, I can always make an adapter plate to narrow it to use my shop vac.  I understand that the key is the baffle with 120 degrees of slot opening.

I have access to all sorts of 3 or 4" pvc sweeps.  Is it better for the chip inlet to be a 90 street ell, or will it perform better with a modified sweep? 

How far is the gap between the inlet and sidewall of the barrel for a 4" set up?