Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 23

Thread: Vacuum Fixtures

  1. #11
    Join Date
    Sep 2006
    Location
    Garland Tx
    Posts
    2,227

    Default

    http://www.talkshopbot.com/forum/sho...highlight=gast

    The Gast pumps have been well spoken of in the past

    sg

  2. #12
    Join Date
    Aug 2004
    Location
    Northern , new jersey
    Posts
    220

    Default vac pump

    What you do not want is a vac pump for service air cond . as they are rotary vane type with a oil res. ,, One like joewoodworker.com is a dry diaphragm type and cycles on and off as needed
    Attached Images Attached Images
    ArtCam Pro 9
    VCarve Pro 8

  3. #13
    Join Date
    May 2014
    Location
    Detroit MI
    Posts
    132

    Default

    Gast oil less rotary vane and Thomas diaphragm pumps are the most common. Most of the cheap pumps on Amazon are the oil spewing variety.

  4. #14
    Join Date
    Jun 2013
    Location
    Pasadena, CA
    Posts
    967

    Default

    Get one of the oil-less GAST or Thomson pumps that are being sold refurbished on e-bay for $150 or so (Google). They usually come with starter capacitor and power cable (check). No oil and they can run for days continuously. I guess they are more industrial than a Chinese consumer device.

    HDPE is fabulous for pods but since I have unintentionally destroyed a few I just use 3/4" Baltic or even solid wood. The porosity is insignificant compared to other leakages (work piece, seals etc.). Another advantage is better friction on the table. The HDPE pods tend to slide around on my aluminum table when not bolted down well. I use 3/8" foam o-ring cord from McMaster. The o-ring channel is undercut with a ball end bit so that the o-ring is captive and can not jump out.

    I use a standard size pod (5x5" or 5x9") for surface cuts that don't go through and where the material is rigid. For through-cuts and flexible material I make disposable "spoil adapters" that sit on top of the pod with a few through holes and adhesive 3/16" flat gasketing tape around the known un-cut areas. To avoid flexible material to be sucked/bowed in between the gaskets, I may create a gasket grid pattern that supports the entire surface evenly. I heard Allstar is good quality gasket but have not tried it yet. I usually take the rubber foam weather strip (Frost King R338H) from the hardware store that compresses under vacuum to less than 20/1000" but will recover. When replacement is needed it scrapes off with a chisel easily
    Box Joint, Dovetail, Guilloche and MazeMaker Software Here

  5. #15
    Join Date
    Sep 2012
    Location
    Blaine Mn
    Posts
    316

    Default

    The ones on ebay seem to be 1/3 HP- how much of a vac fixture
    will that support? Thinking 18x36" approx. Thanks Gene

  6. #16
    Join Date
    May 2014
    Location
    Detroit MI
    Posts
    132

    Default

    Depends on how much leakage you have, and/or how porous the material you're holding. My 1/4HP Gast is rated at 3CFM.

  7. #17
    Join Date
    Jun 2013
    Location
    Pasadena, CA
    Posts
    967

    Default

    Quote Originally Posted by GeneMpls View Post
    The ones on ebay seem to be 1/3 HP- how much of a vac fixture
    will that support? Thinking 18x36" approx. Thanks Gene
    I have one that is 3/4 hp and it can do four 5x5 pods holding solid wood or plywood.

    For 18x36 you will need more volume. For such a large surface you may be better off with a Fein or Lighthouse.
    Box Joint, Dovetail, Guilloche and MazeMaker Software Here

  8. #18
    Join Date
    Jan 2011
    Location
    gleason, wi 54435
    Posts
    429

    Default

    Yes gasketing should pull down to 0. Makes your Z much more predictable. I use 3/8 O.D. surgeons tubing (like you used to make sling shots out of). I have even used the round weather seal material from Home Depot in a pinch. Allstar gasketing sells excellent vacuum stuff although a little pricey it works great (try their cover gasket for dedicated fixturing with a central vac motor). Brady Watson and some others did extensive research and writing about vacuum on this forum if you can search the archives. Bob

  9. #19
    Join Date
    Nov 2013
    Location
    RI
    Posts
    59

    Default All Star Gasketing

    We are working on making up half rolls for the folks that are not in the high production end of the cnc world. Hope fully that will make the cost more affordable to the guys with the smaller machines.

  10. #20
    Join Date
    Jan 2004
    Location
    Cleveland TN
    Posts
    347

    Default

    Bob, is that the same as Latex Surgical tubing, Amazon sells 50' of 1/4"id - 3/8"od for $28 Prime
    2005 PRT Alpha 48x96
    2013 Colombo 3hp spindle
    Indexer (converted lathe)
    Aspire 9.0

Similar Threads

  1. Hold down fixtures (material to use)
    By BPM in forum ShopBotter Message Board
    Replies: 3
    Last Post: 11-26-2014, 07:01 PM
  2. Dedacated Fixtures/ Vacuum hold down
    By gbradley in forum Techniques for Cutting, Drilling, Machining
    Replies: 4
    Last Post: 11-03-2014, 06:50 PM
  3. Software for Fixtures used In-line with SolidWord/Autocam
    By BrandanS in forum ShopBotter Message Board
    Replies: 3
    Last Post: 03-31-2014, 02:43 PM
  4. A couple of table fixtures
    By mzettl in forum Archives2008
    Replies: 8
    Last Post: 06-29-2008, 05:21 PM
  5. Bt32/48 vacuum fixtures
    By dana_swift in forum Archives2008
    Replies: 10
    Last Post: 04-07-2008, 08:14 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •