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Old 01-16-2020, 07:51 AM
Ron Hampe Ron Hampe is offline
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Default Vacuum Manifold Design

Setting up my manifold and thinking that this design will increase the amount of vacuum to each section as needed.

Opinions and/or suggestions welcome.

Thank you
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File Type: jpg Manifold Design 1.jpg (88.9 KB, 89 views)
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Old 01-16-2020, 10:29 AM
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james mcgrew james mcgrew is offline
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Interesting and probably a good idea. I have 5 zones 4 x 4 x 2 and 1 x 1 x 8

I need to isolate the first two zones for smaller work but increasing the spread would be a good idea
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Old 01-16-2020, 09:41 PM
rcrawford rcrawford is offline
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I don't think it really matters enough to use all that extra pipe.

The spoilboard should give enough resistance to airflow that there will not be much air flowing through your pipes. The less air flowing, the better (which is why MDF makes such a good spoilboard).

So really, the plenum should equalize to the same vacuum level no matter how your pipes are positioned (within reason).

Now if you are getting a lot of flow through your spoilboard, then it becomes more important how the manifold is set up. In that case, it also becomes really important how large your pipes are, because you want the least amount of resistance in your pipes.
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Old 01-16-2020, 11:30 PM
Ron Hampe Ron Hampe is offline
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The Hurricane will likely do a decent job of holding a half or full sheet down, but probably not as well when a lot of small pieces are being cut out.

It has 4 motors on 2 switches and with a 4 pipe system (regardless of what I am cutting) there would be at least two motors running and a 4' x 4' area of the table would be under vacuum.

With the 8 pipe system, I can direct the flow from both motors to a single 2' x 4' section or any part of the entire table and the cost for the extra gates and pvc is under $200.
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Last edited by Ron Hampe; 01-17-2020 at 03:07 AM.
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  #5  
Old 01-16-2020, 11:54 PM
Ron Hampe Ron Hampe is offline
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BlackBox recommends 3" for the manifold and 2" for the runs, but I saw a significant increase in performance when I replaced the 4" inlets on my dust collectors with 6".

Would the same be true if I ran all 3" for the Hurricane?

Also which would be better a Fernco or a pvc union to make it easier to remove the Black Box for repairs?

Thank you
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Last edited by Ron Hampe; 01-17-2020 at 12:04 AM.
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  #6  
Old 01-17-2020, 12:31 AM
Charlie_L Charlie_L is offline
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Ron,

I'm not an expert but have spent time with airflows and pressures over my years. The Dust collection is kind of the opposite of the Vacuum. Dust is high CFM (flow rates) and that flow is very dependent on pressure drop due to size and turns of the pipe, etc. Vacuum as Russell points out is low flow rate and also low pressure drop in the piping. The Vacuum system enemy in the piping is leakage. Uniform and controlled leakage through the MDF or bleeder board is used to manage the flow. With sheet goods on top of the MDF, there will be very low flows.

I might suggest checking on the leakage through your valve bodies. If there is significant leakage then adding the extra valves is just losing vacuum.

3 inch for the runs isn't helpful here because the flows will be low.
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Old 01-17-2020, 09:00 AM
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"Would the same be true if I ran all 3" for the Hurricane?"

No
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Old 01-19-2020, 09:52 AM
The real JP The real JP is offline
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If you had a lot of leaks and a big enough vacuum pump to overcome it, bigger pipe and parallel runs would help.

But with limited leakage I don't see how there would be any benefit.

As a curiosity. I wonder what the actual cfm numbers are of the hurricane if you tested with and without a spoilboard and then with a full sheet covering the spoilboard.

Most of us hurricane users would benefit by stepping up to a bigger vacuum pump I think. But even with perfect vacuum you are limited by the size of the part and the pressure that can be physically be applied to it.
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