A mining and metal company was experiencing repeated failures on their fully mechanised bolting jumbo for rock reinforcement in their underground mines and tunnels. Due to a very harsh environment, exposed to water and abrasive particles, they were having short life of only two months from Deep Groove Ball Bearings used in the gear mechanism of bolter. NSK assessed the situation and found hard contaminants were entering the bearing causing failure. They proposed a trial with NSK Molded-Oil bearings which resulted in immediate improvement and 3 times longer lifetime for both the bearings and gears of the machine.
Before | Cost p.a. | NSK Solution | Cost p.a. | |
---|---|---|---|---|
Bearing costs: - Deep Groove Ball Bearings - Bearings replaced 6 times per year |
€ 120 | Molded-Oil Deep Groove Ball Bearings, replaced twice a year | € 360 | |
6 replacements/year x 3 machines x Manpower x €25/h | € 1.350 | 2 replacements/year x 3 machines x Manpower x €25/h | € 450 | |
Gear failure costs: - Gear cost x 3 machines x 6 times/year |
€ 18.000 | Gear failure costs: - Gear cost x 3 machines x 2 times/year |
€ 6.000 | |
Total Costs | € 19 470 | € 6 810 |
Reference:SS-E-8002