A steel mill company producing rails for lift equipment needed to machine two flat areas at the rail ends where the rails would be fitted during the assembly. Because of the length of the rails, the stiffness of the spindle was critical. With original bearings, the stiffness was reduced after 3 months making it necessary to change the transmission tools and the motors. NSK was asked to find a solution. NSK engineers visited the plant and analysed the spindle design. As a result, it was decided to change the combination of the High Precision Angular Contact Ball Bearings to a 4 row set with an increased contact angle. After the change, the bearings continued working for more than one year and no failure was experienced in the motor or transmission.
|Before||Cost p.a.||NSK Solution||Cost p.a.|
|Costs of bearing set||€ 600||Costs of bearing set||€ 800|
|Costs due to four productions stops per year||€ 28.000||No production stops||€ 0|
|Bearing replacement costs||€ 1.500||Bearing replacement costs||€ 300|
|Costs for motors and tools||€ 6.600||No additional cost for motors or tools||€ 0|
|Total Costs||€ 36 700||€ 1 100|