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Thread: Help identify familiar (tool?) markings

  1. #1
    Join Date
    Oct 2002
    Location
    Europe
    Posts
    1,435

    Default Help identify familiar (tool?) markings

    Gang, have a look at this picture.. I know I've seen this type
    of pattern before and I'm finding everywhere on the hexes (and
    nuts/bolts) of my colchester student:



    I assume these are some sort of marks left by an "auto feed" lathe / machine ..
    but would they have been using auto (stock) feed in '65?

    PS the pic is of a ~1/2" hex its the stud that keeps the belt guard on the
    machine but like i said I'm finding those series circles (of diff sizes) every
    where as I clean this machine up.

    -Tony

  2. #2
    Join Date
    Apr 2008
    Location
    winnipeg/manitoba
    Posts
    149

    Default

    Hmmmm. Clearly the first few attempts at crop circles.

  3. #3
    Join Date
    May 2006
    Location
    Grimsby... 51state of the USA
    Posts
    1,043

    Default

    They look like they were put there to index with the bottom of a tightening bolt.

    Rob

  4. #4
    Join Date
    Jan 2010
    Location
    Kansas City area
    Posts
    3,182

    Default Circles

    Those look like the marks left by a cup point set screw. They are not though, setscrew marks are random, not regular and exact as these are. They might be able to be used for indexing, though that would take a careful operator with a light touch. I have not come across this before.

  5. #5
    Join Date
    May 2007
    Location
    UK
    Posts
    201

    Default

    I seem to recall that the circles were rolled in to indicate that the fasteners were new-fangled Unified rather than BSF or BSW or metric.

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