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Vacuum Chucks

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  • Vacuum Chucks

    Has anyone ever built a vacuum chuck? How
    is the amount of vacuum controlled?

  • #2
    Can't help you, at all, on this one! I would think one could use some kind of a "bleeder" valve to control the amount of vacuum, i.e. a controlled leak.
    Try to make a living, not a killing. -- Utah Phillips
    Don't believe everything you know. -- Bumper sticker
    Everybody is ignorant, only on different subjects. -- Will Rogers
    There are lots of people who mistake their imagination for their memory. - Josh Billings
    Law of Logical Argument - Anything is possible if you don't know what you are talking about.
    Don't own anything you have to feed or paint. - Hood River Blackie


    • #3
      Typically the amount of vacuum is constant on a chuck. The amount of holding force is directly proportional to the surface area of the work piece. You can buy a vacuum generator that works off of compressed air out of Mc Master Carr for less than $100. After that you need only build a two piece device that acts as your chuck. Since a picture is worth a 1000 words email me and I will send a photograph and detailed discription to you.

      C. Tate


      • #4
        built several. The thing to remember is holding force is controlled by the inches of Mercury (in/Hg)produced and more important maintained as well as the surface area. The tighter the seal the lower volume needed. I have used a compressed air vacuum generator. They work fine, but your air compressor is going to work also. I have bought small vacuum pumps. They are somewhat spendy, but you are not running your air compressor. I have scrounged them from print shops and dentist offices. The "whipmaster" from the dentist office would "suck a golf ball through a garden hose", kinda like a girl I used to know.
        I also used a three pin fence on most parts to get repeatability of location and to help control lateral movement.
        Remember you cannot drill/mill into holding chamber.


        • #5
          Hey, Step...I knew that same girl! Small world.


          • #6
            You better stop talking about that girl somebody may get offended and tell Neil that you are being crude and suggestive. I knew her too.



            • #7
              I don't think I should tell you about the 10HP 3Phase 4" inlet vacuum pump I sold awhile ago - it really, really sucked.

              Vacuum chucks work well on the mill and grinder, I have never seen a rotary one for lathes (the rotary vacuum interface would be expensive). Wood workers have used vacuum for laminating and work holding for 20 years.


              • #8
                I have built some vacuum patterns for router work that are 4 by 5 feet. When they are that big it really holds. Remember that force equals area time pressure difference.


                • #9
                  I've been pricing Tri-Vacs on ebay because I have one I'm deciding whether to sell or keep and I notice two just ended with no bids and very reasonable start prices...

                  Item #'s

                  This one is very reasonable and may be a steal:

                  There's a couple others on ebay...just thought you may be this point it looks like I'm keeping mine!!! Don't think I'd get enough to make it worth re-acquiring one when I need it.