Tape Lapping of Manganese-Zinc Ferrite Crystals (1st Report)

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Abstract
Experiments were made to study the frictional properties and abrasiveness of lapping tapes and a magnetic tape on two types of rubbing : a running tape against a rotating cylinder of Mn-Zn ferrite crystal, and a running tape against a rotating magnetic head made of ferrite at a high speed of approximately 11 m/s in a two heads helical scan type VTR. Coefficients of friction of tapes are generally independent of the normal load and the sliding speed. The coefficient of friction depends on the material of the abrasive used in tape, while it is independent of the size of abrasive. The coefficient of friction takes the value of approximately 0. 40, O. 30 and O. 24 in the cases of the 1000 and 2000 mesh alumina lapping tapes, the 2000 and 4000 mesh silicon carbide lapping tapes, and the VTR magnetic tape, respectively. In the repeated traversal of tapes, the frictional coefficient of lapping tapes decreases gradually and becomes a nearly constant value after several traversals. That of magnetic tape is, however, independent of the number of traversals. Stock removal of ferrite is proportional to the tape-lapping distance and the normal load applied by tape. The size of abrasive plays an important role on the stock removal rate and a small increase of the size of abrasive increases very much the stock removal rate.

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