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  1. #37
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    Default Re: Vacuum Table questions

    Ok, I swapped out my piping from 1" to 2". I have my dedicated zone hooked straight to my vacuum (Not through the 6 zone manifold) I bought a Trupan Ultra light board (32 lb/ft3). I cut it it half so that I am only covering up my dedicated zone and if all leaks (and I mean all leaks) are sealed I am pulling 20-21HG with boards on and with boards off I am pulling around 15 HG. So I definitely see major improvement there. I am going to take the other half of Trupan and put it on top and see if that will help with having to secure every single leak. So far so good. My 10 HP Becker rotary vane vac is rated for 24 HG so I am happy getting 21 HG. Its also a 2003 model so some loss should be expected due to wear and tear. I will post back on here when I get new results.



  2. #38
    Community Moderator ger21's Avatar
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    Default Re: Vacuum Table questions

    If that pump has seen a lot of use, you should check the vanes, as they may need replacement. I'm getting ready to replace ours (2007). The vanes are about $1300 a set.

    Gerry

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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  3. #39
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    Default Re: Vacuum Table questions

    Thanks for the advice. I actually bought the vac last year and right before I did the seller put new vanes in it. Its rated at 24 HG but I am getting 23 HG right at the vac with nothing attached to it. So I am down 1 HG probably based on the age and use of it. Not a big deal. I will be looking to buy a newer vac in the future but for now this one will work. I am looking at 15-20 HP Busch Minks and Dekker VMax. These Vacs pull up to 29 HG and CFM of over 300. Brand New they are between $10,000 and $25,000 depending on which one I go with.



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    Default Re: Vacuum Table questions

    You skimmed the trupan on both sides right?

    Sent from my LG-D852 using Tapatalk

    In case anyone is wondering, I'm the twin of the other gfacer on cnczone...


  5. #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.



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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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  7. #43
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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.



  8. #44
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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

    UCCNC 2017 Screenset
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    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  9. #45
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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



  10. #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.

    Sent from my LG-D852 using Tapatalk

    In case anyone is wondering, I'm the twin of the other gfacer on cnczone...


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