Custom Rack and Pinion Focuser Upgrade for Sky-Watcher Evoguide 50ED
Project Overview
I have designed and built a custom Rack and Pinion (R&P) focusing mechanism for the Sky-Watcher Evoguide 50ED. The original helical focuser was replaced to provide better mechanical stability, eliminate "slop" during autofocusing, and allow for a seamless integration with the ZWO EAF (Electronic Automatic Focuser).
Technical Specifications
- Drive System: Belt-driven Rack and Pinion 100mm.
- Gear Ratio: 3.33:1 ($40T \text{ GT2 Pulley on the shaft} \div 12T \text{ GT2 Pulley on the EAF}$).
- Resolution: Approximately 19,200 steps per full revolution of the pinion shaft.
- Focusing Range: 0 to 13,000 steps (full travel).
- Hardware: * Precision steel rack and pinion gear set.
- GT2 timing belt (260mm) and pulleys.
- Custom-machined/3D-printed mounting brackets for the EAF.
- rack and pinion link
- use M3 insterts and M3 screws
- Bearing 606 2RS
LukaszW
