Yes, this is ANOTHER Thien Top Hat Pre-Seperator B(uild) log, or blog if you will!!!
I have the in/famous HF 2HP DC, which has been “Hot Rodded”, but that will be another blog entry. My build was inspired by Pitbull over on In The Workshop with Charles Neil. While that build inspired me, I took many liberties and ultimately came up with my own design. (FYI: I’m using a 30 gallon galvanized trash can as my collection bin.)
While researching the build, I stumpled upon the Top Hat Design Guidelines over on the Thien discussion site. The “Guidelines” were VERY helpful. I discovered that a “rectangular intake” was getting good results, so I tried that approach.
I will try & let the maaaaany pictures do the talking, as I can tend to babble! So if something is unclear, ask away!!!
Routing the “Rough around the edges” bottom baffle:
The top & bottom pieces of the Top Hat:
I’m utilizing 1/2” dowels to connect the top & bottom while eventually a sheet of aluminum is sandwiched into a groove as the walls of the seperator. However, as turbulance is a “bad” thing, I wanted the wall to continue further into the “Top Hat”, than on must builds I have seen, to smooth out the flow near the “rectangular intake”. As the aluminum was not long enough, I made an “internal ramp”.
Ply blocking & Sheet metal for the Internal Ramp:
Internal Ramp in place:
Dry fit of Rectangular Intake & 5” Exhaust:
(You can see the 1/8” groove, just inside the dowels, that will eventually sandwich the aluminum sheet wall)
Another view of the dry fit:
Most, Ok ALL, of my projects are of the “Design on the Fly” variety. I used 3/4” ply for the top & bottom of my Top Hat. During some additional fact/info gathering on the Thien Disscusion Forum, I discovered that a thinner baffle is more efficient. Armed with that new knowledge, I decided to put a beveled edge on one of the undersides of the drop shute.
Only one side of the baffle could be beveled:
(The groove, opposite the bevel, will recieve weather stripping, to provide the seal to the collection bin.)
The completed Thien Top Hat:
The burning question….
Q) Does it work???
A) A resounding YES!!!
With the Thien Top Hat completed, it’s time to “Hot Rod” my HF 2HP DC!!!
Well, that’s the plan at least!!!
-- Randy-- I may not be good...but I am slow!