On Fri, 14 Jun 2019 20:10:15 -0700, pyotr filipivich
wrote:

on Thu, 13 Jun 2019 21:27:53 -0400 typed in
rec.woodworking the following:
On Thu, 13 Jun 2019 16:50:42 -0700, pyotr filipivich
wrote:

on Wed, 12 Jun 2019 23:12:39 -0400 typed in
rec.woodworking the following:
On Wed, 12 Jun 2019 14:26:51 -0700, pyotr filipivich
wrote:

Meanie on Tue, 11 Jun 2019 20:34:38 -0400 typed in
rec.woodworking the following:
I'm tired of the sawdust induced filter in my shop vac and decided it's
time to get a better filter, which I assume there isn't anything to stop
sawdust clogging, or make a cyclone separator. Thus, anyone have any
suggestions for a filter or easy plans for a cyclone separator?

Easy plan is that somewhere upstream of the filter, put a "box"
which is much larger than the hose, where in the 'larger' chunks fall
out. With baffles you can cause eddies in the air flow which will
allow more dust to "fall out".

Baffles will increase the air resistance, thus drop the suction
appreciably.

Or buy a small cyclone unit to do the same thing.

Much better but TANSTAAFL.

The formula is that time vs money is a constant. What you save on
one, you make up in the other.
Sometimes, buying "this one" is less expensive than driving all
over town to find a less expensive one. Or buying rather than
building means you're done, and can get onto the next thing on your
list.

Not sure what your point is but baffles just don't work. The increase
in resistance just can't be offset.

Perhaps "baffles" was the wrong word. Something to direct the air
flow in a direction so that gravity can work "for you".

But for gravity to work, you have to slow the air flow. That will
increase resistance and lower suction. Remember, that unlike a
compressor, no matter how much HP you throw at a vacuum, you can only
get to 1ATM. Any loss is gone forever. Cyclone separators work
because the heavier particulates are thrown out of the air stream
without reducing the air velocity (as much).