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  1. #25
    Community Moderator ger21's Avatar
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    Default Re: Vacuum Table questions

    Although we have two, I'm running basically the same pump as you, and have always just used regular MDF.
    My guess is that with Trupan, you may end up with less vacuum, as you'll have more leakage through the Trupan?

    Gerry

    UCCNC 2017 Screenset
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    Default Re: Vacuum Table questions

    Gerry. I am using Regular MDF right now and I am not getting enough vacuum through it. My gauge is reading 17HG with and without boards covering it up. I believe the regular MDF is to dense to allow flow through. Based on the conversation I have had on here with gfacer2 I need to switch to a light or ultra light board. I am not a CNC wizard by any means but I have to believe that I should be experiencing some pressure change when the spoil board is open vs covered up. I think your right Trupan might be way to light. But I have spoke to distributors and not all of them can get Trupan but they told me that if I could find Trupan Ultra Light then that would be the best on the market for spoilboards.



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    Default Re: Vacuum Table questions

    gfacer2. I asked them if I could just get them from a buyer and they said probably not because the buyers buy it by the truckload and go through it very quickly for production of furniture



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    Default Re: Vacuum Table questions

    I do know some people prefer straight mdf as ultralight can compress a bit (I personally don't think it's as dimensional stable as mdf).

    but as the brand of mdf I tried was horrible (no flow) I went back to an ultralight to get up and running.

    So experimenting is needed but then you'll settle into one that works. You might call some cabinet shops and just ask them.

    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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    Default Re: Vacuum Table questions

    was the difference you seen from the regular MDF to the ultra light a HUGE difference or just a better? Also I am cutting 3/4" HDPE so I dont know if there are other requirements for hold down force on this stuff then regular wood



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    Default Re: Vacuum Table questions

    Quote Originally Posted by Nick12 View Post
    was the difference you seen from the regular MDF to the ultra light a HUGE difference or just a better? Also I am cutting 3/4" HDPE so I dont know if there are other requirements for hold down force on this stuff then regular wood
    Yes huge for me. Unusable even for a day. Basically as you described maybe 2hg drop with open 5x8 table vs all valves closed (just relief valve).

    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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    Default Re: Vacuum Table questions

    I was using Duct tape to seal my edges. What is absolutely the best way to seal the edges?



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    Default Re: Vacuum Table questions

    Quote Originally Posted by gfacer2 View Post
    Yes huge for me. Unusable even for a day. Basically as you described maybe 2hg drop with open 5x8 table vs all valves closed (just relief valve).

    Sent from my LG-D852 using Tapatalk
    Thanks for your help. I will be purchasing a light board tomorrow. I will get back on here and let you know how things go later. Thanks again



  9. #33
    Community Moderator ger21's Avatar
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    Default Re: Vacuum Table questions

    Make sure you are using a standard, "cheap" grade of MDF, rather than the premium, or "super-refined" grades.

    Gerry

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

    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)


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    Default Re: Vacuum Table questions

    The stuff I am using now is cheap grade stuff and I am not getting any flow through.



  11. #35
    Community Moderator ger21's Avatar
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    Default Re: Vacuum Table questions

    I can put the palm of my hand on our spoilboard and feel the vacuum pulling through.

    Gerry

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

    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)


  12. #36
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    Default Re: Vacuum Table questions

    Yes I also feel the vacuum pulling through my current MDF board when I put my palm on it. But its still not pulling through enough. I am getting 17 HG on my table with or without the spoilboard being covered up. I found some Trupan Ultralight (32 Density). I am going to pick it up now. and I am also going to change the size of my piping from 1" to 2" and see if that helps at all. I will keep everyone posted. Thanks for all your help.



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