And another Vaccum question

[ttwark]

I have read every post pretaining to vaccum set up and have incorporated many things that I have read into our system, but I have not seen anything related to the situation that I'm having. I have 4 Fein vaccums feeding into a main line then brancing in 6 zones that can be run as needed. I have a 3/4" mdf spoil board surfaced on both sides that hasn't been glued down yet,and it is not ultralite or Trupan just the cheap stuff that Home Depot sells. The situation is that when the system is on, the vaccum hoses are collapsing almost completely shut, and the canisters are noticeably collapsing also. This just doesn't seem right to me. The hold down is not that impressive,(not what I thought it would be). Any opinions on what I may be missing or is this normal?

[thewoodcrafter]

Tom,
I think you really need to use the light weight MDF.
It is more pores than the standard stuff.
You will also need to surface both sides.
The suck should be way better.

[wooden_innovations]

I had a similar problem with a 2 fein setup and ultralite mdf.

The Fein hoses begin to collapse when they get warm. My solution was to connect the feins directly to the pvc plumbing on my table.

I glued a modified piece of pvc directly to the fitting on the fein. I then connected the new intake on the fein to the pvc plumbing on my table - no glue here so that it can be removed easily.


Rodney

[Brady Watson]

"I think you really need to use the light weight MDF." & " My solution was to connect the feins directly to the pvc plumbing on my table." - Agreed.

Standard Depot-grade MDF has WAY too much resin in it to be used as a bleeder. Try to find Trupan or Ultralight. In the Brady's Tips & Tricks section on the SB website, I just posted the BradyVac II system, that can be used with any material. It is not a universal system...but it also runs circles around a universal system as far as hold-down is concerned.

-B

[harryball]

I've not collapsed a canister (though I've seen them deform) but I have seen the hoses deform and collapse about 1/2 way at 6" of vac. As soon as the vac decreases the hoses expand and airflow kicks in. I've not considered it a problem since there is such little airflow at 6" and my holddown works very well.

FYI, I tried a piece of depot MDF as a bleeder and from experience I can tell you it does not work well. Get the UL or Trupan UL board as suggested.

Robert

[scott_smith]

This worked great on my mini Fein vac.
I took the hose fitting off and shoved a 2” rubber coupling in the hole.
Scott

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