The method of counting allowances is created by prof. V. M. Kovan more than 40 years ago. Therefore today, when computers are used, it is possible to estimate more deeply the components of allowances and in that way it is possible to make the method of counting more accurate. The research object: it is a theoretical character job, which include dependent on such factors as: material solidity and of used up instrument. The purpose of the paper the allowance size depends on the production cost. The increase of allowance size, it will increase metal outlay, cost on cutting tool, electrical power, and so on. However on decrease of allowance size it will depend on worse detail waster percent and in some case the netting tool will work in malevolence conditions. So it’s very important to calculate allowance size. The elastic deformations of technological system which appear because the hardness of the material changes and because the machining tool wears mechanically. It is shown in this case intermediate dimensions of parts are counted.

Šiame tyriamajame darbe išnagrinėjome, kokią įtaką detalės užlaidoms ir tarpiniams matmenims, turės detalės geometrinės ir kitos paklaidos. Kaip keisis minimalaus matmens išraiška po apdirbimo, kai detalės paviršius bus išgaubtas arba įgaubtas. Nustatėme minimalias užlaidas, esant bazinių paviršių ir apdirbamų paviršių tarpusavio padėties paklaidoms, taip pat įvertinome pjovimo įrankio dilimo ir temperatūrinių deformacinų įtaką. / The subject of the work: The influence of geometric and other errors for overlaps and idle measurement. The object of the research: The calculation of overlaps constituent and minimal idle measurement. The aim of the research was to revael the influence of the geometric and other errors for overlap details and idle measurements. What is the change of the aspect of minimal measurement after manufacturing when the surface of the detail is convex on concave. The research has defermined the minimal overlaps, when there are errors of the base and manufactured surface inter – position, also the influence of the cutter decrease and resilience was determined.