With a economical source locally for spiral ducting and wye’s, I begin my journey into the realm of understanding dust collection and building a Thien baffle. I spent a good amount of time Saturday reading everything I could about constructing the top hat baffle. Not too many picture results come up via Google or lumberjocks, which I found a little surprising but mostly from Phil Thien website and forum discussions. But then, maybe everyone prefers cyclones. I choose a Thien baffle on a 55gallon drum BEFORE the dust collector to save on impeller longevity.
Here is what I have gathered so far:
1.) I have a dual bag 3HP grizzly dust collector. 7” inlet rated 2100 CFM.
2.) I will be using 7” 26 gauge metal duct from inlet of dust collector (which shall be mounted above) to outlet of Thein baffle with the use of a bell mouth I have to order from Penn State once it comes in stock.
3.) The Thein baffle unit will be 12” tall on top of a 55 gallon plastic barrel. This will allow a 6” round to rectangular inlet from the main run and lots of space (2-3 swirl rotations before separation). Similar to this youtube video
4.) The 270 degree cut out will be either 1” or 1 1/2”.
5.) No all-thread or bracing INSIDE the chamber itself.
6.) 6” spiral ducting and wye’s to all machinery (no 4” drops) with a couple clean-out hatches.
7.) The baffle plate itself will be 1/8” hardboard (or 26 gauge sheet metal…unsure yet)while being supported by 1-2” recessed 1/2” MDF underneath.
8.) the polycarbonate lexan (i’ll be talking to a local supplier of what is best for the application) will be 13” tall so that the bottom edge fits thru the bottom of the 270 degree arc.
9.) 1/4” minor ramp/bump in the chamber before the inlet so air particles do not collide harshly.
10.) no use of air straighteners as I do not know if they are needed with the dust collector inlet just being 12” above baffle unit.
after this upgrade, i’ll look into getting the pleated round filters for the grizzly but dang it… dual canister’s = 2x the money :) so the filters might take a bit of time to get around to. also, will have to look into search results of building my own blast gates.
anyone else care to comment with suggestions or pictures of their own interpretations?