Shibumi Astro Engineering RA Axis Stiffness Kit for EQ8

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Shibumi Astro Engineering RA Axis Stiffness Kit for EQ8

This kit consists of a torsionally stiffer, higher precision substitute for the OEM RA axis shaft.

The OEM shafts in all EQ8 mount types are 55mm OD and made from turned aluminium. The shaft bearings comprise a pair of opposed tapered roller bearings preloaded by an M54 x 1mm cast iron ringnut.

SAE’s replacement RA shaft has nearly identical dimensions but is turned and cylindrically ground from grade 304 stainless steel. It, therefore, has three times the torsional stiffness of the OEM aluminium part, helping raise the maximum imaging payload. The fit to the ID of the shaft bearings is a transition fit, not a clearance fit. The diameter of the most restrictive section of the internal bore through the shaft is increased to aid in passing USB Type B connector shells through the mount.

For design reasons, run-out errors in the RA tapered roller bearings do not affect RA worm gear mesh clearance, and there are no grounds for exchanging the OEM bearings for a higher precision grade.

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