English to Russian Tech/Engineering Engineering: Industrial thermal cutting

For laser cutting, the maintainable dimensional tolerances depend essentially on the geometry and the pretreatment condition of the work piece.
If necessary, the limit deviations shall be agreed upon separately.
The limit deviations for the cut surface quality (perpendicularity or angularity tolerance) are ***treated separately from the limit deviations for the dimensional deviations of the work piece*** in order to emphasize the different influences on the work piece.
The definitions for the limit deviations are based on the independence principle described in ISO 8015, according to which the dimensional, form and geometrical tolerances apply independent of one another. The limit deviations do not include the deviations from perpendicularity or angularity.

Что-то я подзапутался малость - слишком много deviations, поэтому не могут толком понять выделенный фрагмент - please advise!