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  1. #1
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    598

    Default Vaccuum Pump Check Valve

    Off today to the Mens Shed Router with a small vacuum table, 84x84 mm.

    Plan is to hold blank 3 mm MDF 90x90 mm stock and reduce it down to 86x86 with R12 corners.

    Problem is, the vacuum pumps I purchased off ebay (Chinese cheap) need a check valve to operate.

    So today's trial will have to rely on the dust vacuum cleaner.

    Anyone got a simple design or suggested source for a suitable check valve ?

    If the trial is a success, I will report with photo, details and a glowing description.

    John.

  2. #2
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    598

    Default

    The trial at the shed was a success.
    The dust vacuum cleaner supplied the vacuum, and we didn't run it long enough to overheat.

    The vacuum table is 9 mm polycarbonate screwed to 1.6 mm aluminium plate with 4 mm diameter ball nosed cutter grooves and a turned brass hose fitting glued in with epoxy.

    Cutter was 2 mm diameter single flute at 12,000 RPM, cut 0.4 mm with feed 200 mm/min cutting clockwise (climbing).

    No sign of blank moving on the table.

    Photo shows the table and a typical end result after the engraving steps.
    Coaster Vacuum Table 8Nov16 Compr.JPG
    John

  3. #3
    Join Date
    Jun 2016
    Location
    Sydney
    Posts
    202

    Default

    You get similar check valves in compressors. They are nothing more than a very flat smooth bit of steel sitting inside a shallow cavity over the top of a hole underneath.

    A check valve on my compressor died. No air. Disassembly showed that the flat bit of metal had cracked in half. Dear me. I removed one blade from an old feeler gauge, polished one side on 2400 W&D, cut it to shape, and reassembled. It runs very nicely.

    Truth be told, any solid bit of good shim might do.

    Cheers
    Roger

  4. #4
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    598

    Default

    Thanks Roger, my investigations has produced very similar for vacuum.
    Thin plastic/rubber material in a disc with a centre fixing to a metal disc with 4 holes.
    John

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