Used Internal Grinding Machines for Sale — 337

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    Why Internal Grinding Machine?

    CNC Internal Grinder with the control panel

    Grinding is a surface finishing operation in which abrasive particles contained in a bonded grinding wheel shape and finish the components made of metal or other materials. Internal diameter or simply ID grinders finish the inside of a previously drilled, reamed, or bored hole, using small grinding wheels at high RPM. Several different internal contours can be produced within a work piece using internal grinding machines, including CNC internal grinding machine or internal cylindrical grinding machine.

    Types of Internal Grinding Machines

    The internal grinders can be broadly classified into three different types as follows:

    • Chucking type internal grinder – The work piece is usually mounted in a chuck. A magnetic face plate can also be used. A small grinding wheel performs the necessary grinding with its peripheral surface.
      Outer view of Chucking type Internal Grinding Machine
    • Planetary internal grinder – When the work piece is of irregular shape and cannot be rotated conveniently, the planetary internal grinder is opted for. In this machine the work piece does not rotate. Instead, the grinding wheel orbits the axis of the hole in the work piece.
    • Centreless internal grinder – An internal centerless grinding machine is used for grinding cylindrical and tapered holes in cylindrical parts like cylindrical liners, various bushings etc. The work piece is rotated between supporting roll, pressure roll and regulating wheel and is ground by the grinding wheel. 

    Motion in Internal Grinding Machine

    Grinding wheel arrangement in OVERBECK 400 IR Internal Grinder

    The principle elements of a used internal grinding machine are the workhead, which holds the work piece to be ground with its own drive; and the wheelhead, which is the internal grinding spindle. The most popular internal grinder is similar in operation to a boring operation in a lathe. The work piece is held by a work holding device, usually a chuck or collet, and revolved by a motorized headstock. A separate motor head in the same direction as the work piece revolves the grinding wheel. It can be fed in and out of the work and also adjusted for depth of cut. In addition to the rotary motions of work and wheel, an internal grinder has a traverse movement to bring the wheel to and from the work zone, and a reciprocating spindle movement for both the wheel's approach to the work surface and for the feed movement of the wheel during grinding.