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Thread: New Dual Pump Vacuum System

  1. #11
    Join Date
    Oct 2009
    Location
    KenCraft Co Inc, Toledo Ohio
    Posts
    78

    Default

    Brady.

    I've done a lot of onion skin cutting with maybe 80% satisfaction on results. You mentioned above "ut 90% through all of your parts first, then go back full depth with minimal cutter to material force to shave off that little bit" Can you explain minimal cutter force a bit more.

    Tracy Spitulski
    KenCraft Co Inc.
    PRSa 6096
    www.kencraftcompany.com
    Hardwood Lumber, Custom Millwork
    Dust Collector Fittings

  2. #12
    Join Date
    Jan 2004
    Location
    iBILD Solutions - Southern NJ
    Posts
    7,926

    Default

    Tracy,
    If you don't break through the onion skin, you won't lose suction. The idea is to let vacuum hold down your parts while cutting aggressively (tool pushing back against material with high force) - without breaking through the skin. Then when all of the parts are cut, say .7" deep in .75" thick material, come back and make the tool go .75" deep, cutting all the way through your parts - now breaking through the skin and inevitably letting the vacuum leak through the kerf. Since the tool is only cutting .05" off of the part on the last pass, there is very little force being exerted, and therefore, the parts shouldn't move even with low vac showing on the guage.

    There are other things that come into play depending on what you are cutting, how grabby the material is, how high your chipload is and the geometry of the tool being used to cut the parts. If your parts are still moving with good vacuum numbers and onion-skinning, you may want to look into a compression spiral, or even straight flute tool. In more extreme cases, a downcut can be used, at the expense of blowing out the bottom edge and packing the kerf with chips (straight will pack them also - sometimes to your advantage, such as with plastics.)

    Does this make sense?

    -B
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

  3. #13
    Join Date
    Feb 2015
    Location
    NC, USA
    Posts
    80

    Default

    Brady,
    Which pen are you using to make the control board?
    And where did you get it. I can find thick line but that looks pretty thin.

  4. #14
    Join Date
    Jan 2004
    Location
    iBILD Solutions - Southern NJ
    Posts
    7,926

    Default

    Wigitworks with Micro Sharpie. Now unobtanium. Not WW's fault. Sharpie stopped making them.

    I have another setup under development to fill the void for when these dry out. Something completely rebuildable and adjustable.

    -B
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

  5. #15
    Join Date
    Feb 2015
    Location
    NC, USA
    Posts
    80

    Default

    Got it thanks.

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