A printer found that he was replacing a pin and block style universal joint on his embosser weekly. Heavier universal joints only seemed to result in gear box bearing failures.
A careful review of the installation revealed that the misalignment involved compound angles. Given this situation, the coupling was producing an irregular velocity on the output side. Since the inertia of the driven roll was larger, a significant torsional shock was produced in the coupling twice every revolution. When they went to a heavier joint, this shock load was passed back to the gear box bearing.
At our suggestion, the customer was able to move the drive assembly to minimize the compound angle. We were also able to supply a needle bearing universal joint which could accept more misalignment and absorb higher shock loads.
That was several years ago – so far … no replacement. Do you have a problem coupling that needs help? Eaton Airflex clutches in stock