Saturday, August 23, 2014

Hitachi Commutator Manufacturing

Audit of TM Shop #23 Work Instructions was started. Following WIs were audited :-

Stacking of Hitachi Commutator ( W23.027):-
Points noticed:-

  • Triclorothylene solvent which is used to clean copper segments was checked for expiry date ( Mfd in 2008).

  • Jigs INJ-33 , INJ-34, INJ -106 were being sent for calibration.

  • Instruction no 3.8 was not being followed ( use of the triangular block and 0.5 mm guage).

Static Pressing of Hitachi Commutator After Stacking (W23.028)
Points noticed:-

  • Pressing Jig HITA/COM/6 was being sent for calibration.
  • No of heating –cooling cycles and its duration (6hrs) could not be maintained as per instruction no 3.1

  • Alkyd varnish WI-294 was checked for expiry date.

  • Production staff was made conversant with the steps to be followed in this WI.
  • Gauges used for checking inner dia were sent for calibration.

Inner Dia was checked in the recently made commutator C8446 was found to be 276 mm ( within limit).

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