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Thread: Vacuum hold down fixture for cnc router.

  1. #11
    Content Editor DIYer's Avatar
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    Thanks machiningfool! We've added your Vacuum Hold Down Fixture to our Workholding category,
    as well as to your builder page: machiningfool's Homemade Tools. Your receipt:




  2. The Following User Says Thank You to DIYer For This Useful Post:

    ncollar (04-22-2018)

  3. #12
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    Bob
    I think you did a very nice job and holding anything soft and possible of deforming or smashing with pressure requires a better way and you nailed it. Nice job and thanks for sharing
    Nelson

  4. #13
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    machiningfool's Tools
    Thank you very much. It does work as designed and I am surprised at the holding force. Bob.

  5. #14
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    Ralphxyz's Tools
    Now I want to see it working or more so how you actually use it!!

    Ralph

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    machiningfool's Tools

    Vacuum hold down.

    Quote Originally Posted by Ralphxyz View Post
    Now I want to see it working or more so how you actually use it!!

    Ralph
    Ralph, if you have read all of the posts by me regarding the vacuum hold down, your questions will be answered. How I use it is, I cut a piece of plastic to fit the entire fixture and turn on the vacuum. It pulls 2 lbs. per square inch, so, 8" by 32" =256 sq. in. and 512 lbs. total pressure, enough to hold the plastic rigidly for cutting. I use a drag knife in my router and the cutter cuts almost through the plastic and I remove the parts by bending the plastic. The plastic is about .040 inches thick. Thanks for your interest. Bob.

  7. #16
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    Thanks Bob, " the cutter cuts almost through the plastic " was what I was wondering about and would like to see in action.

    I was picturing cutting all the way through and losing the vacuum as you moved along but almost through should retain the seal.

    Ralph

  8. #17
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    Answer

    Quote Originally Posted by Ralphxyz View Post
    Thanks Bob, " the cutter cuts almost through the plastic " was what I was wondering about and would like to see in action.

    I was picturing cutting all the way through and losing the vacuum as you moved along but almost through should retain the seal.

    Ralph
    Yes, that is where I thought you were going. No it doesn't cut through, for that reason. Bob. No vacuum this time.

    link to Youtube
    Last edited by machiningfool; 08-15-2018 at 04:27 PM.

  9. #18
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    Bob, Nice job on the vacuum table.

    Most commercial CNC routers use a vacuum table. Your's is a good example of how to build one for a home use environment. thanks for posting.


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