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  1. #1
    Hi all..

    A few years ago, I went to the NEC to drool over some ready made CNC machines.. On one of them a vacuum bed was being shown with a MDF waste board mounted on the bed.. When I asked, I was told that the MDF was a 'special' type that was porous and allowed the vacuum to grip boards through it..

    My local supplier thinks I had a too many sherbets that day and that such a thing does not exist.. Anyone out there share my hallucination and know what this MDF is called?


  2. #2
    Not sure I understand where the 'porous MDF' is coming from as you would not be able to seal away from the object being clamped.
    Vacuum clamps usually have valves and seals to limit the area under vacuum.
    I think they may have been pulling you leg a bit!


  3. As far as i am aware all they do to the mdf is take the surfaces off the mdf making it less sealed.

  4. #4
    Definitely saw it demoed at the exhibition.. I was more wowed by that than the cnc..
    Thanks AdCNC, easy enough to test.. Will machine the surface off a bit tomorrow and try it.. If the workpiece flies off the table, back to the drawing board..!


  5. #5
    Ptjw7uk.. If I remember right, the mdf was placed on top of the vacuum table, but allowed the air to pass through it.. The cnc was machining kitchen units out of 8' x 4' boards.. I do remember being told that the mdf was available off the shelf but as I said, cant seem to find it now I am looking..


  6. #6
    I wish you well but I would caution you to be careful as you could leave to much open surface and loose most of the vacuum.
    Most vacuum systems are designed for specific jobs ie mass production etc and care has to be taken or it will fail.
    The other possibility is if you have a high throughput pump then it could withstand a fair amount of leakage etc.
    edit - just had another thought after rereading post, If the 8x4 was on a 8x4 mdf and the vac table was 8x4 then there would only be leakage when you cut through.

    Last edited by ptjw7uk; 22-11-2010 at 08:08 PM. Reason: extra info

  7. #7
    hi was it not the peg board type of stuff?,-hardboard,-mdf--hdf-10/
    mine has a vacbed the waste board according to the instruction book is made out of normal 6mm mdf, no metion of porus mdf,
    its cut to the right size then theres a program to cut the holes in the right places, this is then attached to the vacbed with a few bits of double sided tape to secure it,
    the work piece is put on the bed, and any surplus holes coverd with off cuts to get a better hold,

    Click image for larger version. 

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  8. #8
    Toddy's Avatar
    Lives in livingston, United Kingdom. Last Activity: 4 Weeks Ago Has been a member for 7-8 years. Has a total post count of 17.
    He was pulling your leg as mdf is non porous as such that it would let you vac through it to hold your job,(joiner to trade) lol

  9. Quote Originally Posted by Toddy View Post
    He was pulling your leg as mdf is non porous as such that it would let you vac through it to hold your job,(joiner to trade) lol

    MDF is quite the opposite to none porous, unless i must be buying "special" MDF lol

  10. #10
    Is there such thing as LDF (i.e low density..), that would surepy be more porous?

    Couldn't you mask off the open areas of the bed with bits of paper. Just have a stack of A4 paper and distribute it to cover the gaps.

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