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The directional stability (drift) is caused by irregularities of the feed mechanism as an individual machine funktion, without using a sewing thread. The method is applicable to motor-operated household sewing machines, but it may also be possible to apply it to hand- or treadle-operated machines. Includes additionally to definitions, principle, preparation of the sewing machine, prodcedure, expression of results and test report an annex which specifies material and apparatus.
||Household sewing machines - Determination of directional stability (drift)