The eccentric shaft ends of B, C and A requirements of 28156 and 28317 bearing eccentric excircle reference cylindrical eccentric direction, and eccentric size different, generally within 5mm, eccentric error less than 0.05mm.
In order to 28156 and 28317 bearing meet the above requirements, the following process and tooling.
Firstly, all the excircle machining A benchmarking, process cartridge on both ends of the axis are left 50mm 25mm, asked chuck and the A benchmark coaxial and step surface and vertical A benchmark.

Both ends of the clamping head milling shaft into a flat 42h6, see Figure 1, flat and A requirements reference center symmetric and both ends of 28156 and 28317 bearing the parallel.
Tooling fabrication: card tank two, as shown in Figure 2, with the center hole slot 42H7 B5 symmetry, end face and the center hole vertical.
The card canned on both ends of the axis, the card tank eccentric direction should be consistent with the card slot, the tank with the axis of the flat 42H7/h6, control of the eccentric direction; adjusting eccentricity by compression screw adjustment card on the tank; the step surface compression card can end and the shaft, shaft centre and guarantee card center tank parallel.
Clamp with double top mounted on the lathe, four claw clamping can rotation, using A benchmark both ends of the outer circular table for surveying adjustment screw, card on the tank, to 28156 and 28317 bearing adjust the eccentricity of different, turning the eccentric outer circle to size.
When the eccentric shaft processing after trim both ends the process cartridge.
The processing method is simple, reliable, avoids the tedious processing method (boring hole), the eccentric shaft processing can be applied to multiple eccentricity requirements consistent direction of.