MITSUBISHI MATERIALS CORPORATION
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GRINDING THE CUTTING EDGE OF MIRCO-MINI BORING BAR
  • MICRO-MINI boring bar can be applied to boring and grooving without any modifications. It can also be reground as shown below.
  • For shaping and regrinding, use diamond whetstone approximately #250-#400. Please grind according to application using the figure below as a reference.
  • WHEN USING THE MICRO-MINI TWIN BORING BAR
  1. To avoid chipping of the 2nd cutting edge take care when inserting the boring bar into the holder. Refer to fig. 1. If the 2nd edge contacts the internal face of the holder there is a possibility that it may chip.
  2. Fig. 2 shows a side lock holder. When using this type of holder there is a possibility that damage to the shank and the 2nd cutting edge can occur.
    Make sure that the clamping screws are tightened to the set torque value. Additionally make sure that there is no clamping screw near the 2nd cutting edge as this can break the boring bar.

  • When using Mitsubishi holders with a tool overhang of 5, ensure that the 3rd clamping screw is removed prior to machining.
    (For RBH1620N, RBH1920N‚ there are no 3rd clamping screws).
    The set torque value for clampimg screw is 2.0 N•m.