We’ve had some Amacoil/Uhing rolling ring linear drive users tell us they machined the inner race of a ball bearing, then tried to replace a worn or damaged rolling ring bearing in their Amacoil/Uhing rolling ring linear drive. The results are, more often than not, unsatisfactory. A rolling ring bearing starts off as a double shielded ball bearing. But the inner race of the ring (the surface which will ultimately contact the drive shaft) is precisely contoured at Uhing in Germany using special CNC machinery and a proprietary technique backed by decades of experience.