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  1. #41
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    Default Re: Vacuum Table questions

    Yes I did and there is a lot of flow. Maybe to much. Thats why I am going to add the second layer and see if that helps. When I first fired up my vac with boards on I had 10 HG. Then I started going around and sealing up leaks. As I did I quickly started pulling 20 HG.



  2. #42
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    Default Re: Vacuum Table questions

    Something still seems off. The way I read that is that you have a pressure differential of 5 to 6 hg (loaded state with boards vs unloaded, spoil board only). That seems too small for your set up. Might work, it's better but seems low.

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    Default Re: Vacuum Table questions

    I went back out and played with my table more and I got 19 HG with table loaded and 10 when not loaded. The major problem I have is that my HDPE boards have rounded edged so when they are butted up next to each other air is allowed to escape. That is out of my hands. I now understand why some of these other companies are running 40 HP Dekker VMax pumps. Even with 19 HG I am still having to tab my pieces. I am sure with a 40 HP I would not.



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    Default Re: Vacuum Table questions

    I wouldn't be so sure.
    You're biggest issue is probably the parts sliding on the spoilboard?
    Dedicated pods or fixtures would probably be a better choice. Or something to prevent parts from sliding, like these? Needle Plate 16 hole, .5mm | Birkonium CNC Services

    Gerry

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    Default Re: Vacuum Table questions

    If I use those then they will leave little holes in my pieces and I cant have that on my final product. Thanks though



  6. #46
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    Default Re: Vacuum Table questions

    So you still haven't explicitly said this, but are you cutting the same thing all day everyday?

    Is the material textured? Pic?

    Like Gerry said, I don't think you have a vacuum issue at heart.

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    Default Re: Vacuum Table questions

    I am reading a lot about the pipe size under the table. One post says the plumbing diameter should be at least 1 size larger than the inlet on the pump. Another is saying just use 2" on everything. What is the general rule of thumb for diameter. The inlet on my 10 Hp Becker pump is 3". Should I be using between 3" - 4" pipe to each zone. I have 2" now and I am just wondering if I am still cutting off flow by stepping down from the inlet?

    Thanks



  8. #48
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    Default Re: Vacuum Table questions

    If it's pulling a lot of air through the system, then larger diameter will move the air quicker. If you are pulling high vacuum, but not moving a lot of air, then it probably doesn't matter as much.

    On our 5x12 table, with two 10HP Beckers, each inlet has a Y with two 3" hoses to the table.

    Gerry

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    Default Re: Vacuum Table questions

    I dont understand. The pump is rated at 169 CFM and 24 HG. You mentioned you have 3" hose running to the table. What about under the table. Is it 3" running to every zone outlet? Right now my table is pulling 15 HG with or without the spoil board being sealed. I thought is I need to allow more air flow so that my HG is at 5 or less with an open table and 10-15 HG with a closed table. Does this sound accurate?



  10. #50
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    Default Re: Vacuum Table questions

    Our table is one single zone. The 4 hoses are for better distribution.

    Sorry, I don't really know the math behind it.

    Gerry

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    Default Re: Vacuum Table questions

    So is it safe to say that you have 3" hose running to each inlet on the table? How large are the inlets on the plenum? Also, is it safe to say that the hose going from the pump to the table and all the plumbing under the table should not be less than the inlet on the pump which in this case mine is 3" so I should use 3" or larger piping for my complete system?



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    Default Re: Vacuum Table questions

    Quote Originally Posted by Nick12 View Post
    So is it safe to say that you have 3" hose running to each inlet on the table? How large are the inlets on the plenum? Also, is it safe to say that the hose going from the pump to the table and all the plumbing under the table should not be less than the inlet on the pump which in this case mine is 3" so I should use 3" or larger piping for my complete system?
    So if your inlet is 3" then your manifold should 3" or bigger. Your pipes to the zones should equal the cross section of the manifold or bigger. If you might usually only run 2 zones then yeah 3" all around is probably fine. I have 6 zones so I went 4" manifold, 2" to the zone and each hole (3 holes per zone for my set up) has a 1.5" pipe. The inlet is 3" I think.

    But of bigger note is that your spoil board absolutely should show a difference if sealed or not. I can tell by the 15hg you have a high vacuum Becker style system and not a regen blower. The Becker type of vacuum should absolutely vary if the spoil board is in sealed pretty much regardless of pipe size if at all close. I'd make sure the spoil board material is porous enough.



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