The A in our AtoZ of Coupling Definitions.

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A

ADAPTOR PLATE – A component used to secure the coupling components in alignment. It is used to mate components of dissimilar mounting arrangements, for example, motor to the pump or gearbox etc.

ADVANCE – The axial distance a taper bored hub is pushed onto the shaft to give the required interference fit, starting from hand tight fitting, that a tapered hub can be advanced to ensure sufficiently tight engagement.

ALIGNED SHAFTS – Two or more shaft that have the same coaxial centres of rotation.

ALIGNING SURFACE – This is the reference point in a coupling assembly that is used to achieve alignment. It is also sometimes used as the surface for the dial indicator to read from for the same alignment.

ALIGNMENT – Shaft Alignment is the procedure of having two or more shafts concentric and aligned to each other, within a specified tolerance. That tolerance is a function of the machine design and purpose.

ALIGNMENT PROCEDURE – There are several ways to achieve shaft alignment, including straight edge, dial indicator and laser alignment. All methods require their own specific procedure, but effectively ensure that the shafts being aligned are within the required tolerance.

AMOUNT OF UNBALANCE – The degree to which several items are out of equilibrium with each other.

ANGULAR MISALIGNMENT – The angle generated by two non-parallel shaft axes that are not coaxial or aligned with respect to one another.

ANGULAR STIFFNESS – (also BENDING STIFFNESS) – A force or moment measurement that will angularly misalign a coupling a specified amount of distance.

ARBOR (refer MANDREL) – A shaft or tube used for mounting a rotating component for either balancing and/or machining.

APPLICATION FACTOR. Service factors, also known as application factors or experience factors, are based on the applications and are applied to the customer specified or normal operating torque. These factors are used in the selection of couplings and take into account the prime mover and the driven equipment. This factor accounts for torque loads beyond the nominal conditions that effect operation such as compressor fouling, shock loading, variable loads, temperature etc. The acronym is SF.

ASSEMBLY BALANCE – The act of balancing a complete, machined and assembled coupling.

ASSEMBLY CHECK BALANCE – The act of measuring the unbalance of a complete, machined and assembled coupling.

AXIAL DISPLACEMENT (also END FLOAT) – The measurement of the difference in axial positioning of the shaft end during operation.

AXIAL MISALIGNMENT - Relative axial movement of the two shafts towards or away from one another, maintaining parallel alignment.

AXIAL NATURAL FREQUENCY – The frequency of the spacer component when used between flexible elements within a coupling.

AXIAL STIFFNESS. A measure of the coupling’s resistance to axial displacement. www.thompsoncouplings.com

AXIS OF ROTATION. A line about which a body rotates as determined by journals, fits or other locating surfaces.?