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Useful Points

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Some Useful Points
  •  CENTRES:
    It is impossible to do precision work on cylindrical grinder unless the centres are true, __accurate, clean, lubricated. Otherwise the work will be out of round.
  •  WHEEL MOUNTING:
    A very common fault is to tighten the flangs more than necessary. Wrinkles or scurfed areas on blotters or gaskets cause uneven pressure and make wheel run out of round.
  •  EXTERNAL GRINDING:
    In external grinding it is better to use generous quantity of coolant while truing with a diamond dresser as there will be less chance of fracturing the diamond, as such heat is generated while diamond is in contact with the wheel . Do not use coolant while dressing an internal grinding wheel.
  •  PRECICION WORK:
    For precision work it is good practice to re-balance the wheel after truing because the hole in the wheel and wheel mount may cause the hole to run out at periphery.
  •  INTERNAL GRINDING:
    Generally speaking , the diameter of the internal grinding wheel should not exceed two third of the diameter of hole. It should be remembered that as the size of the wheel increases, the diameter of the hole being constant , the greater the area of contact becomes between wheel and work, thus increasing the heat and probably distortion of the work.
  •  USE OF WHEEL:
    Do not use the wheel which is too tight on the arbour of the internal grinding spindles or sleeves as it may break when started.
  •  GRINDING BELTS:
    Internal grinding belts, with their high speed and small diameter pulley, must be frequently checked for oiliness, wear and tightness, as slippage is a serious fault.
  •  INTERNAL GRINDING SPINDLE:
    High speed internal grinding spindle's bearing are very sensitive to slight irregularities. Because of their special construction and special races and balls, it is best that repairs be made only by the spindle manufacturers. Lubrication of spindle is of great importance.
  •  FAULTY DRESSING:
    Faulty dressing is one of most frequent causes of faulty grindings, short wheel life and poor finishes.Because of the small size of the wheels used in the internal grinding it is essential that the diamond should be of proper size and maintained with sharp point.
  •  ADJUST TAIL STOCK:
    Common faulty is to adjust tail stock to the work on all jobs and leave the head stock at the end of the way. This causes uneven wear and soon forces refinishes of the ways.
  •  AIR IN HYDRAULIC SYSTEM:
    When started the machine after it has stopped for number of hours it is necessary to traverse the table few time to expel the any air that may have entered the hydraulic system.