A few months earlier when I decided to convert my single phase Harbor Freight dust collector into a two stage system I discovered there were three basic techniques:
1. Make a cover or purchase to go on top of a bucket for chip separation. The problem here is that the cyclone produced inside the bucket keeps the dust stirred up so a great deal of dust that goes into the bucket ends up being drawn back out.
2. Make a Thien baffle. This is comparable to the very first option, however includes a bottom layer that separates the cyclone impact from the collected dust, preventing it from getting trapped and then sucked back out.
3. Purchase or make an after market cyclone. This does not have the issues of simply a chip separator cover, but is a lot more complicated to develop than a Thien baffle, and relatively costly to buy aftermarket.
One of the things I learned during my research study is that all of these techniques reduce the air flow of your dust collector since they introduced a lot of extra air resistance. Your filter lasts a lot longer because most of the trips and a bulk of the dust are separated before they reach the filter. Blowing some fine dust out of my roof is alright, blowing every particle my dust collector chooses up would not be.
I received an Oneida Dust Deputy as a present and I recognized I had the chance to generate the information I could not find and share it; a side by side comparison of a Thien baffle and cyclone.
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Link to full article: http://www.ycmt2.com/thien-baffle-vs-cyclone-efficiency-comparison/
The issue here is that the cyclone created inside the bucket keeps the dust stirred up so a lot of dust that goes into the container ends up being drawn back out.
One of the things I discovered during my research is that all of these techniques decrease the airflow of your dust collector since they presented a lot of additional air resistance. Your filter lasts a lot longer since many of the trips and a majority of the dust are separated before they reach the filter. Blowing some great dust out of my roof is fine, blowing every particle my dust collector picks up would not be.
What I could not discover is a side by side contrast of each option to figure out which is the most effective. My intuition thought that a molded cyclone would be the most effective, however they consist of a lot more volume than a Thien baffle … and this is a new location of research for me so I did not trust my gut. The only info I could discover was that just a chip collection lid is certainly the worst of the 3, however still an improvement over a single phase.
Dust Deputy: http://amzn.to/2kXkQQN
Super Dust Deputy: http://amzn.to/2l4gt8N
Super Dust Deputy XL: http://amzn.to/2l4gt8N
For expense factors, I chose to make a Thien baffle because I could do that with material I had on hand. I got an Oneida Dust Deputy as a present and I realized I had the chance to create the info I could not find and share it; a side by side comparison of a Thien baffle and cyclone. I bought an anemometer and chose to find out for myself.