BACKLASH Backlash is the clearance or gap between the trailing or non-driving surfaces of the coupling jaws and flexible element, illustrated in red on the above diagram. When used in reversing or heavy cyclic applications where the coupling is required to rotate in both directions the application must be considered with the type of use, number of starts per hour considered and an appropriate service factor applied to prevent premature failure of the coupling element. Standard spider 'teeth' are curved in two directions. NON-BACKLASH The coupling element and claw profile are designed such that the element is compressed when the coupling is assembled in order to remove backlash, typical applications are for indexing or positioning drives such as lead screws or encoders where a high degree of accuracy is required. The pre-compression or preload of the element whilst providing greater accuracy also increases the dynamic torsional stiffness from 25% to 75% over the standard element at 50% of it's nominal torque rating, (depending on coupling size), thus maintaining accuracy even after extended periods of use. Nonbacklash spider 'teeth' are curved radially and parallel axially. 55 #DriveLineHarmony www.jbj.co.uk/couplings.html Pump Drive Components Backlash Explained
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