Thread: My ongoing adventures in Dust collection.

comment on your band saw if I may, 2nd photo, I would use a reducer (pic attached) for first hose then a 100/150 Y this I think would give smoother air flow but I stand to be corrected by those with more knowledge.
sending a PM as well.

Originally Posted by Jasethebeginner

Thicknesser

Thicknesser pick up.jpg
This is the markII version.

Jointer

No photo but I have bell mouth hood that gets locked into place using the thicknesser bed. I will be making a custom housing to try and improve the collection.

Currently I have 1200mm of 150mm PVC and the minimum flex I can get away with to hook the DC to the machines. The improvement in the collection is massive. I know I am not getting 1200CFM but I am a lot closer.

is the piece on the thicnkesser just a 150mm pipe, cut and bent?

how did you bend the pipe halfs? heat with a heat gun and bend.

The felt airflow is I would guess 3 times what I had with the original Thein setup. Next steps were to upgrade all the machines. I am not done yet, the table saw is proving to be more complicated than I thought.

I doubt it would be 3 times. Thein's typically reduce flow by between 20 and 40% so unless you had some other significant obstruction its not possible to get 300% more air through the impeller

Currently I have 1200mm of 150mm PVC and the minimum flex I can get away with to hook the DC to the machines. The improvement in the collection is massive. I know I am not getting 1200CFM but I am a lot closer.

Given the restriction caused by the tight flexy bend connecting the impeller to the filter, and the improvement that a pleated filter would provide, my guess is you would be getting about 850 CFM before adding ducting and machines.

JI’d have to agree with BobL re flow. I made all the mods you made and measured the airflow with a Hotwire anemometer. I have over 6 metres of 150mm pipe attached and the best I have achieve on the long run is about 780cfm from memory. My readings are in the the mod thread.

Thanks all

Tonyz - I have replied to your PM. I am wondering if it will produce an improvement, at the moment the two 100mm flexi's are deformed but the inlet area should be mostly unchanged. The reducer would produce smoother airflow but bringing it down to 100mm and then branching it out to two 100mm runs "might" not bring an increase in air flow. I don't have a means of producing an airflow figure so if the change is not large I really couldn't tell. At the moment it seems to work ok.

Havebeer69 - Yep that's exactly what it is. The bending was done with a heat gun, very cheap XU1 from bunnings, a couple of clamps and some scrap timber to hold it all flat. The end cap is some scrap ply held in with sealant and thin ally sheet. The hold downs are bungee straps.

BobL - All my "measurements" are feel and perception. I don't own or have access to actual test equipment. All my estimates based on how it feels to my un-calibrated hand. There was considerable choking after the Thein previously. It was reduced to 5 inch, I had 4m(ish) of ally flexi ducting into a home made Y junction to two 100mm PVC runs of about 6m. It was vented outside without filters. I posted some pics in another thread quite some time ago and your estimate of the airflow was under or about 300CFM from memory. So if I am now at 800ish CFM I have at least doubled my airflow. I do take your point about the tight bend from the blower to the drum. I wasn't happy with it but I need to keep it mobile and get it back into action. Sounds like a perfectly good reason to build a custom DC trolley in the near future.

Originally Posted by Jasethebeginner

. . . . .All my "measurements" are feel and perception. I don't own or have access to actual test equipment. All my estimates based on how it feels to my un-calibrated hand. There was considerable choking after the Thein previously. It was reduced to 5 inch, I had 4m(ish) of ally flexi ducting into a home made Y junction to two 100mm PVC runs of about 6m. It was vented outside without filters. I posted some pics in another thread quite some time ago and your estimate of the airflow was under or about 300CFM from memory. So if I am now at 800ish CFM I have at least doubled my airflow.

Yeah that sounds about right - wasn't sure what your initial starting setup up was.