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  1. #1
    Member
    Join Date
    Sep 2014
    Posts
    60

    vacuum boxes and hold downs

    Hi.
    I am expecting a 6090 machine soon ..I'm very new at cnc

    i have seen a number of u tube videos on making vacuum hpls downs.

    The donek tools guy uses a shop vac.

    I'm toying with the idea of building a table since double stick tape can let go when least timely and clamps and screws can be a pain.

    I expect to be doing guitar parts and similarly sized jobs in timber.

    I would appreciate advice re vacuum boxes eg is a shop vac gutsy enough? how big a chamber is necessaty etc etc

    and other advice re hold downs generally.

    I have done a few searches and didn't get much joy there.

    Thanks,
    Rob.

  2. #2
    Registered
    Join Date
    Aug 2009
    Posts
    644

    Re: vacuum boxes and hold downs

    Not sure how big guitar parts are bit sounds like you need a high vacuum gasket jig set up (if small).

    A few threads cover the theory but long and short is small pieces are hard as they have a small area for the vacuum (really the column of air above) to push on.

    And trust me they can fail at bad times too (is there ever a good time I ask rhetorically).

    Look at all Star adhesives for gasket bits. Never used but I do peruse.

    Sent from my LG-D852 using Tapatalk
    In case anyone is wondering, I'm the twin of the other gfacer on cnczone...

  3. #3
    Community Moderator ger21's Avatar
    Join Date
    Mar 2003
    Posts
    34568

    Re: vacuum boxes and hold downs

    I'm toying with the idea of building a table since double stick tape can let go when least timely
    So can vacuum, or any other methods.

    Look at the vacuum clamping at joewoodworker.com
    That's similar to what you want. High vacuum with fixtures, not an entire table. And no, a Shopvac won't work for this.
    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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