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Adventures in Engine Turning

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  • Adventures in Engine Turning

    Thought you gents might find this useful especially if you have never tried this before. I am rebuilding a Harig Surface Grinder and needed to rewire and reswitch the electrics. Thought it would be a good time to spiff it up some. Here's the process:

    Tools:

    Mill or Drill-press running at ~1000 RPM touch time about three seconds (light touch)
    Cotton Buffing Bob of desired diameter
    Clover Lapping Compound (shown is results on steel and aluminum using 280 grit (fine))
    Paint brush
    Lots of time and patience
    DRO is certainly useful if using a drill press graph paper is a good alternative

    Here are the results:








  • #2
    Spiffy!

    Adds that nice finishing touch.

    Finest regards,

    doug

    Comment


    • #3
      Looks good,should be able to adapt that to CNC even.
      I just need one more tool,just one!

      Comment


      • #4
        Very nice Hammerfest!!

        Good looking stuff!

        Comment


        • #5
          Very, very nice. Ive been working on a redesign of the electrics on my mill. Think I might have to do something similar.
          "I am, and ever will be, a white-socks, pocket-protector, nerdy engineer -- born under the second law of thermodynamics, steeped in the steam tables, in love with free-body diagrams, transformed by Laplace, and propelled by compressible flow."

          Comment


          • #6
            Mmmm, mm. I think I may have a couple projects that need some brass and an hour on the mill table now...

            Comment


            • #7
              The spirit of st louis.



              THINK I READ SOMEWHERE ..YOU HAVE IT RIGHT, WHEN YOU GET THE RAINBOW EFFECT LIKE A CD



              all the best..markj
              Last edited by aboard_epsilon; 07-01-2012, 07:22 AM.

              Comment


              • #8
                Not sure how you would get a rainbow effect, might be more related to the material.

                Comment


                • #9
                  Do you clear coat? Or sometimes, depending on usage...

                  Or do any future scratches/marks sort of get lost in the pattern?
                  Last edited by RussZHC; 07-01-2012, 09:59 PM.

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                  • #10
                    Extremely fine,even scratch pattern in the turnings might give that effect.

                    Comment


                    • #11
                      Originally posted by aboard_epsilon
                      THINK I READ SOMEWHERE ..YOU HAVE IT RIGHT, WHEN YOU GET THE RAINBOW EFFECT LIKE A CD



                      all the best..markj
                      That looks like the mylar used for stickers etc, very shiny and the pattern is far too square to be engine turned.


                      Yep:
                      http://www.identi-tape.com/deco-prismatic.html#
                      Last edited by kendall; 07-01-2012, 08:36 PM.

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                      • #12
                        The rainbow effect is the result of a light-wave interference patterns. You need parallel uniformly space scratches. The spacing of the scratches need to be of the same order as the light wave length, so something around 0.001 mm or less.

                        Phil

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