Examples of parallelism measurement include mutual parallelism between rolls and other surfaces in papermaking machines, printing presses, rolling mills, etc. Other examples include overhead tracks, rails, press machine tables.
The laser beam is directed along the machine, but perpendicular to the measurement object. The principle is based on the beam being deflected at 90° with the aid of a penta prism. In this way it is possible to measure a large number of objects on long machines by moving the penta prism along the machine in the direction of the laser beam. The detector (mounted on a magnetic base, for example) is moved to the front and rear end of the measurement object. Machines up to 80 metres in length and with 150 rolls/objects can be measured.
The results show the squareness in relation to the reference line graphically and digitally. A completed measurement shows the mutual parallelism of the measurement objects (e.g. rolls) in relation to the base line or one of the measurement objects.