IGM-15NC2 Precision Twin Spindle CNC Internal Grinding Machine

Okamoto's new IGM-15NC2 precision twin spindle CNC internal grinder affords today's progressive machinist optimum grinding versatility, productivity and precision through advanced machine design and construction. "The benefits of incorporating 2 spindles on the same grinder are numerous", states Ed Weinberg, manager of technical sales for Okamoto. He added, "The elimination of multiple chucking not only simplifies set-up and boosts productivity, but also optimizes workpieces dimensional accuracies. For example, a workpiece that requires an ID, OD and face grind normally necessitates the use of two separate grinders. Since no two machines are exactly identical, and the workpiece has to be re-chucked, the relative accuracy's of the ID, OD and face are lost. This is not the case with our IGM-15NC2 because the workpiece stays fixtured on one machine and the spindles needed for the multiple grinds ride on the grinder's high-precision wheelhead.

The IGM-15NC2 has an internal diameter to be ground capacity of 0.24" - 4". The maximum grinding stroke is 3.2" and maximum swing over table is 24". This I.D. grinder is compact and requires floor space of only 116" x 90" x 65 ". Machine weight is 5,300 lbs.

The IGM-15NC2 is equipped with a Fanuc l8i-TA 2-axis simultaneous control with conversational programming for easy data input. The simple "teach input" format reduces programming time making it ideal for operators that are new to CNC I.D. grinding. This enables easy set-up and programming for grinding internal diameters, outside diameters and faces in a single chucking for optimum productivity and accuracy. A convenient interrupt function enables the operator to interrupt the automatic grinding cycle at any time to re-dress the wheel if desired an then continue grinding. In addition, a feed-hold function permits for cycle stop and verification of location and dimensions.

The IGM-15NC2 features heavily ribbed Meehanite cast iron construction for exceptional rigidity. The table rides on high precision linear guideways and is driven by an AC Servo motor that enables minimum feed increments as fine as 0.00001". Maximum longitudinal travel is 20". Feed rate ranges from 0.001" to 400"/minute.

The IGM-15NC2's high performance wheelhead is equipped with two rigid, high frequency inverter controlled spindles with 10,000 and 20,000 rpm spindles speeds standard. Any combination of 10,000/15,000/20,000/30,000/40,000 and 60,000 are available as optional. A 2-point diamond dresser dresses grinding wheel ODs and faces. The X-Axis (crossfeed) is a closed loop feedback system with linear scale. This in combination with an AC servo motor drive and a high precision internally cooled crossfeed ball screw enables peak accuracies with minimum infeed increments as fine as 0.0000 1" (dia.). The maximum crossfeed (X-Axis) is 12".

The IGM-15NC2's workhead features cast iron construction and utilizes high precision double angular contact bearings. Workhead speed is infinitely variable from 100 - 850 rpm and is programmable through the CNC. Workhead swivel ranges from -5¡ to 15¡. The work spindle is powered by a 2 hp motor.

      For more information contact:

      Okamoto Corporation
      1500 Busch Parkway
      Buffalo Grove, IL 60089
      847-520-7700
      Fax 847-520-7980
      Booth #7021