About this product
Model: sae_eq8r1000
Part Number: EQ8R1000
Shibumi Astro Engineering Declination Axis Stiffness kit - EQ8-R
This kit includes all parts needed to replace the OEM Declination axis shaft and shaft bearings with stiffer, higher precision parts which greatly reduce
DEC worm wheel run-out errors which exacerbate DEC backlash problems.
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. These are mounted to the shafts with clearance. The OEM bearings are of commercial grade, for which the inner race run-out error is permitted to range up to 25 microns. The sum of the bearing/shaft clearance and the inner race run-out error cause unacceptable displacement of the DEC worm wheel relative to the worm gear, before consideration of the actual run-out error of the worm wheel assembly itself.
SAE’s replacement DEC shaft has nearly identical dimensions but is turned then cylindrically-ground from grade 304 stainless steel. It has 3 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 passing USB Type B connector shells through the mount.
The P5-grade shaft bearings SAE supply reduce the maximum permissible run-out error from 25 to 5 microns and halve the inner race diameter tolerance to 12um. These tighter tolerances greatly reduce variation in Declination worm wheel/worm gear mesh clearance as the Declination shaft is rotated.
Specifications
| SKU | EQ81000 |
| Name | DEC Axis Stiffness Kit for EQ8 |
| Quantity | 1 |
| Weight | 2.5kg |
| Packed Dimension | Carton 28.5x14.5x9.5 cms |
| Contents | Pair of P5 grade precision DEC axis tapered roller bearings, DEC Axis Shaft, bearing lubricant, installation instructions. |
| Mount Compatibility | Skywatcher EQ8 or Orion USA HDX110 German equatorial mounts |
| Installation Difficulty | Moderate |
| Often Bought With | SS Fastener kit, Clutch Upgrade kit, LD DEC Anti-Backlash kit, Environmental Sealing kit, Pin Wrench for axis shaft ringnut removal. |
| Highlights | This modification is a pre-requisite for users interested in controlling Declination axis backlash while simultaneously raising imaging payload. For light duty use, it will usually be possible to obtain acceptable control of DEC backlash using SAE’s LD DEC ABL kit alone. |
| Fitting Service | Please contact FLO |
| Warranty | 2 Years |
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