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9/16-18 O -ring tool

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  • 9/16-18 O -ring tool

    Has any body ever made the tool to ream the bore and put the 15 deg chamfer prior to tapping. If so I would like to see how you did it also if the tool is available at a reasonable cost commercially.

    Reason is I am trying to repair a 5 port manifold on my air compressor , it's old but a good 2 cylinder one sold years ago by Montgomery Wards and I do not know who made it.

    Thanks Graeme
    Last edited by GRH; 01-23-2009, 12:17 PM.

  • #2
    Assuming you mean an SAE O-ring port.

    I made a small one for 5/16-24 from an 11/32 screw machine drill.I had the benifit of a surafec grinder and spin index to grind the OD of the tap drill step first,then finished the angles by offhand grinding.

    There are port forming tools availible,IIRC MSC carries them,but they aren't cheap.

    If you just need to do a few I would freehand grind a tool for the 15* chamfer out of an old endmill.
    I just need one more tool,just one!


    • #3
      Yes the O-ring port tools are nice if you need to do a bunch. It's a form tool, so that once you have a pilot hole, it does the tap drill, the chamfer and a spot face at one go.
      "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill


      • #4
        Drill rod, machine diameters, mill cutting edges, harden and temper, hone cutting edges.

        You can rough size using various drills and use above as a "Reamer". Used to have to make many "Special" milling cutters from SilverSteel (Drill Rod)

        Regards Ian.
        You might not like what I say,but that doesn't mean I'm wrong.