Thread: Dust Extraction Experiment

Thanks for posting this.
I think something similar has been posted before but anyway is is very useful for newbies even is it's stuff that is already known

Just a couple of comments.
The fan performance figures (air flow and static pressure) he generates are only part of the picture. What we really need is the entire Fan pressure curve (air flow versus applied back pressure). The tells us how the fan will perform under a restrictive load such as that generated by ducting/junctions and machinery.

Don't ever try to make a full speed full size impeller out of wood like that. The rotational energies are such that the impeller could simply explode its way through the housing. In fact don't even consider making your own impeller unless it can be dynamically balanced.

Another factor to consider is noise generation. Straight vaned impellers usually make more noise

Don't you have a different design of vane depending on if the intake is on the side or the front? I thought the only easily reversible ones were straight vane because they are pretty average in either direction.

I'd imagine people would be able to plastic print some pretty nice designs these days.

Originally Posted by Ubernoob

Don't you have a different design of vane depending on if the intake is on the side or the front? I thought the only easily reversible ones were straight vane because they are pretty average in either direction.

Tha's correct but side inlet and side outlet is a very inefficient way to move air so is rarely used.

I'd imagine people would be able to plastic print some pretty nice designs these days.

It will indeed be interesting to see what folks come up with.
It might be some time before cheap printers are able to make an impeller that can withstand a chunk of wood or metal going through it.
But for general shed venting, a well designed plastic fan should be fine.

The beauty of (cheap) 3D printing is being able to make a new one if the old one gets broken.

Originally Posted by Colin62

The beauty of (cheap) 3D printing is being able to make a new one if the old one gets broken.

Good point but breaking a blade could do a lot more damaged and may even end up destroying the whole DC and other stuff nearby. When a blade or two breaks off the whole thing becomes a high speed unbalanced rotational object that jumps around like a giant frog in a sock.