The woes of vacuum - how I wrecked my shop built duct collector before I finished it

[tillius]

Well, I'm surprised at how much vacuum a 2.5HP, 6 gal. craftsman wet-dry vac produces...

I got a used salt drum from the local water softener man, rigged it together with my shop vac and extra hoses/couplers and it was working great during testing.. all the sawdust was going into the salt drum and falling to the bottom, none passing into the vac. I tested it by cutting about 5 feet of 3/4" dado on the TS, worked like a charm...

Then I got nutty, pulled the hose off TS, stuck an extension wand onto the end of it and started vacuuming pine needles off the drive way when a huge wad of needles suddenly cloged the hose and guess what happened?

the salt drum crumpled like a beer can...

Well, at least I know it works, but I've got to find a different precolletor container.

Tillman

[Larry Jaques]

On 16 May 2004 17:54:26 -0700, tillman [e-mail] (tillius) brought forth from the murky depths:

Yeah, Crapsman really sucks, doesn't it? (couldn't resist that straight line)

Har! Got JPGs? ;)

Or rig up a failsafe device. Cut a 3" square hole in the intake line before the first stage fiber can, then duct-tape a piece of trash can liner (or whatever) over it. When the hose gets plugged, it'll suck a hole in the "failsafe" and prevent collapse.

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[Juergen Hannappel]

[...]

Im not so sure, i've seen (mylar) *thin* foil of about that size stand on-sided vacuum without breaking, and i'm talking "real" vacuum (10^-3 mBar) here.

[Sandy]

On Mon, 17 May 2004 09:30:56 +0200, Juergen Hannappel posted:

Just keep in mind that the strongest vacuum EVER is only 14.7 psi below atmospheric pressure. Less than 15 psi! Weak as worms' water!

[Larry Jaques]

On Mon, 17 May 2004 09:30:56 +0200, Juergen Hannappel brought forth from the murky depths:

So don't use Mylar, Milo. Use a second-hand baggie, trash can liner, latex glove, whatever. Test it (without the collapsible can) to make sure it works. Man, do I have to -think- for you guys, too? ;)

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[DarylRos]

Try prying something apart in a vacuum bag.

[Sandy]

On 18 May 2004 15:29:27 GMT, [e-mail] (DarylRos) posted:

For 4 square inches, that'll be