I now have 2 Ridged vacs, and both have canisters. They're around 5 years old, not sure. My very old ShopVac has a bag though. The bag worked just as well as the canister, far as I can tell, but was easier to clean.
True but all you need is to get the air spinning in a circular pattern and let the heavier than air dust fall to the sides, with the clean, lighter air sucked up the middle. That's how cyclones work, no need to get too fancy.
Not exacly true. See jbstein.com.
snipped-for-privacy@notreal.com on Wed, 12 Jun 2019 23:12:39 -0400 typed in rec.woodworking the following:
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.
Primo!
If it works, it's not stupid.
Not sure what your point is but baffles just don't work. The increase in resistance just can't be offset.
snipped-for-privacy@notreal.com on Thu, 13 Jun 2019 21:27:53 -0400 typed in rec.woodworking the following:
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).
I had the same issues with an old (70's) Craftsman vac with a pleated filter. Easy enough to knock clean but constantly "doing its job".
This vac is now dedicated to my ROS and I use the small dust deputy designed for a 5-gallon bucket. The DD is expensive for what it is but after waiting for some good coupon/shipping deals I feel _ok_ about the price. Functionally it is excellent and I only bother to clean the filter when my bucket gets about half full and needs to be emptied. I used the Rockler hose/adapter kit for the connections from the DD to my ROS and router, also expensive but totally functional. Your project after getting these parts will be to construct a cart to combine the vac and DD into a unit that wont tip over and can still be portable/wheeled to where you need it.
This is one of those things where spending some money up front creates something that you wish you had done long ago. You can build your own cyclone and save some $$, just depends on your time/money ratio.
-BR
snipped-for-privacy@notreal.com on Sat, 15 Jun 2019 09:30:27 -0400 typed in rec.woodworking the following:
Ah. Note to self, that's how cyclones work.
Sometimes I'm cheap, other times I'm not, though much depends on the cost. Much has to do whether I want to spend the time building or simply buying. At around $50 for the DD, I may just buy.
Maybe, BUT any blockage that makes vortices will accelerate the chips (and the air), as does a centrifugal separator. The high-dust-content outer edge of the vortex is where wall collisions stop the woodybits. It's just a balance against how much suction you lose when the chips CLOG THE FINAL FILTER.
A real centrifugal separator can whirl so fast that even the smallest particles hit the sidewalls, while the (lower pressure center of the) vortex is flowing the near-clean air through the final filter stage. That sucks up lots of power, just like baffles would.
Me, I work outdoors over a deck with gaps, and my nostrils are higher than the dust sources. The dust is mainly on the shoes.
I work over gravel and grass.
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