The invention relates to a method in the process of manufacturing andor finishing a fibre web, in which method said continuous and moving web, andor a moving means related to the processing of the web, is monitored by at least one optical spectrum separating measurement device to determine at least one quality variable of said object for the purpose of controlling the quality or condition. Dynamic rendering is give priority over other event handlers. The stampings have outer transversely oriented channel parts which, when the raceways are fixed together, have the open channel parts aligned and abutted to define a generally closed tubular cross section which defines the rim of the wheel.