Technical terms

Technical term	explanation
Offset	The center lines of the two axis are not concentrical but parallel.
Angular deviation	The center lines of the two axis are not parallel.
M-machine	Movable machine. The machine that is adjusted relative the stationary machine.
M-unit	The measuring unit that shall be mounted on the movable machine.
S-machine	Stationary machine. Shall not be moved..
S-unit	The measuring unit that shall be mounted on the stationary machine.
Softfoot	Offset Angular deviation Offset and angular deviation Softfoot A condition where the machine stands on three feet instead of four. This of course means that the machine is standing unstable on the foundation. Should be adjusted before alignment.
9-12-3 method	For shaft alignment when the built-in electronic inclinometers cannot be used,for example on ships in the water.Instead the readings are registered in fixed 9, 12 and 3 o clock positions.
PSD	Position Sensitive Device Basically a thin layer of silicon. When the laser beam hits the detector, an electric current is created at the point hit by the beam. The resistance in the surface layer gives rise to a splitting of the current, so that the currents over the electrodes become of different strengths. This makes it possible to determine the position of the center of the beam. Class 4