Machining Question

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  • nocheepgas
    Senior Member
    • Dec 2008
    • 811

    Machining Question

    I know we have a few machinists on the forum.....

    I've bored a 2" diameter hole in some 3/8" aluminum at a 19 degree angle. I would like to machine an o-ring slot in the center. Obviously the hole isn't round, it's oblong since the hole was bored at an angle. Since this is not CNC, what's the best way to deal with this?
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    More stuff than I can keep track of..
  • thermopsummit
    Member
    • May 2010
    • 41

    #2
    location of o-ring slot

    Is it on outside surface of plate or in the bore? if its in the bore, a square column mill can tilt its head to your 17 degrees with the stock clamped squarley on table, i would use a boring bar and custom grind a bit for the o ring groove
    Last edited by thermopsummit; 04-29-2011, 07:53 PM.

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    • nocheepgas
      Senior Member
      • Dec 2008
      • 811

      #3
      Originally posted by thermopsummit View Post
      Is it on outside surface of plate or in the bore? if its in the bore, a square column mill can tilt its head to your 17 degrees with the stock clamped squarley on table, i would use a boring bar and custom grind a bit for the o ring groove
      I want to o-ring the inside of the bore, you can't cut the o-ring groove at the same angle as the bore, otherwise it would not be in the center of the plate but would wander from beyond the top to beyond the bottom of the plate. I can't do a simple cut on my rotary table since the bore is out of round.
      I'm a learning, hack, hobbyist machinist..........
      Last edited by nocheepgas; 04-29-2011, 08:32 PM.
      Miller Syncrowave 200
      Homemade Water Cooler
      130XP MIG
      Spectrum 375
      60 year old Logan Lathe
      Select Machine and Tool Mill
      More stuff than I can keep track of..

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      • piniongear
        Senior Member
        • Jul 2008
        • 308

        #4
        I agree with what Thermosummit told you.
        Bolt the plate down flat on the mill table.
        Then tilt the head of the mill 19°.
        Using a boring bar with a ground cutter to make the slot...... Have at it.
        This is going to leave you with a groove centered in the 19° bored hole.
        If your desire is to have the O ring centered in the 3/8 thick sheet then I am afraid you are out of luck.
        At that plane you at looking at an ellipse, not a circle.
        A CNC machine might be able to do the cut, but with a manual machine it will be impossible.
        pg
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        • Bob Miller
          Senior Member
          • May 2010
          • 820

          #5
          I'm thinking die grinder or router.
          Die grinder by hand.
          Router at 19*.
          Just a guess on my part.
          Good Luck,
          Bob

          EDIT: On second thought the router might not work at 19* . May be flat, but won't be even.
          Last edited by Bob Miller; 04-29-2011, 10:33 PM. Reason: see above
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          • cncmachinist
            Senior Member
            • Feb 2010
            • 159

            #6
            wow i guess im late to the party here

            based on what youve said it can be done on a mill-turn CNC or with a carbide insert boring bar ground with a step and to get even a decent grove a solid carbide ground cutting edge to cut the ring MIGHT work but y couldnt the oring groove be offset at the 19 degree angle


            maybe i get some stock and try to see it can be done
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            • nocheepgas
              Senior Member
              • Dec 2008
              • 811

              #7
              Originally posted by piniongear View Post
              If your desire is to have the O ring centered in the 3/8 thick sheet then I am afraid you are out of luck.
              At that plane you at looking at an ellipse, not a circle.

              pg
              Yup, that's what I'm after!
              Miller Syncrowave 200
              Homemade Water Cooler
              130XP MIG
              Spectrum 375
              60 year old Logan Lathe
              Select Machine and Tool Mill
              More stuff than I can keep track of..

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              • Blondie_486
                Senior Member
                • Feb 2007
                • 746

                #8
                I'm not sure this can be done without CNC. Perhaps a router bit with a guide bearing on it such as a laminate trimming bit and custom ground to an "O" ring profile but then when you get to the outer edges of the ellipse you're going to also be dealing with an angle which would affect the depth of the cut. I don't know what your exact application is but....Perhaps a flange and gasket would be an easier solution?
                Blondie (Owner C & S Automotive)

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