Method for supplying cutting oil

A method for supplying cutting oil which adopts the following steps in a machine tool for cutting plural kinds of work pieces:

• a:
• setting cutting times t1, . . . , ti, . . . , tn for work pieces 1, . . . , i, . . . , n and selection of cutting oil to be used wherein n is an integer of not less than two, and i denotes a kind of work associated with the ith work piece in advance of cutting the work pieces 1, . . . , i, . . . , n,
• b:
• setting quantities q1, . . . , qi, . . . , qn of the cutting oil supplied to the cutting area of work pieces 1, . . . , i, . . . , n per unit time according to a cutting area of the work pieces 1, . . . , i, . . . , n, where the cutting oil selected by step a is used in advance of cutting the work pieces 1, . . . , i, . . . , n,
• c:
• setting a quantity q of a fixed value supplied to the cutting-oil tank per unit time where the value of q is greater than any value of q1, . . . , qi, . . . , qn, and
• q≤(V+q1t1+ . . . +qiti+ . . . +qntn)/(t1+ . . . +ti+ . . . +tn)
• are each satisfied, wherein a volume of the cutting-oil tank is given as V, and a quantity of the cutting oil in the cutting oil tank before cutting is set to be zero, and
• supplying the cutting oil continuously to the cutting-oil tank by the quantity q over an entire period of time during which the work pieces 1, . . . , i, . . . , n are cut,
• d:
• supplying the cutting oil, from the cutting-oil tank, to the cutting area by setting quantities of the cutting oil to be q1t1, . . . , qiti, . . . , qntn on cutting the work pieces 1, . . . , i, . . . , n.