Elektronic focuser for Newton or Refractor with 2" dual speed Crayford 1:10
Description
Elektronic focuser with NEMA17 for Newton or Refractor with 2" dual speed Crayford 1:10 for [OnStep ](https://groups.io/g/onstep/wiki/home) telescope goto controller or my Focuser Hand Controller [(FHC)](https://www.thingiverse.com/thing:3384824). Wiring diagram and PCB on [EasyEDA](https://easyeda.com/hujer.roman/Focuser-with-NEMA17) FreeCad source code on [GitHub](https://github.com/romanhujer/Elektronic-Focuser-for-Sky-Watcher/blob/master/MyFocuserFreeCad/MyFocuserNema17.FCStd) ### BOM: 1x NEMA17 Stepper Motor JK42HM40-1684 or similar types 1x 16 Teeth GT2 Timing Pulley with Bore 5mm for 6mm belt 1x 140-GT2 Timing 6mm belt 4x M3x10mm screws 2x M3x20mm screws 2x M3 nuts 4x supports under the M3 screws 4x 2.5x8mm self-tapping screws 4x 2x6mm self-tapping screws <b>Option I - For main 40 Teeth Pulley V1 </b> 3x M4 Grub <b>Option II - For main 40 Teeth Pulley V2 </b> (Recommended for use) 1x Aluminum Shaft Coupler Pore Diameter: 4-5mm, DxL: 14x25mm 2x M4x6mm imbus screew <b>Option III - For metal main 40 Teeth Pulley</b> 1x 40 Teeth GT2 Timing Pulley with Bore 5mm for 6mm belt 1x Shaft Ø5x50mm 1x Aluminum Shaft Coupler - Bore diameter: 4-5mm, DxL: 14x25mm <b>Option IV - For Cluch - 3D printed Shaft Coupler </b> 6x M3x20mm screws 6x M3 nuts <b>Option V - For 3D printed 18 Teeth Pulley</b> 2x M3x20mm screws 2x M3 nuts ###NOTE: My Focuser Hand Controller (FHC) is on [Thingiverse](https://www.thingiverse.com/thing:3384824) Wiring diagram and PCB on [EasyEDA](https://easyeda.com/hujer.roman/fouser-handheld-controller) Firmware and FreeCAD sources on [GitHub](https://github.com/romanhujer/Elektronic-Focuser-for-Sky-Watcher) ###Update: * 2019-03-11 Add Refractor version * 2019-11-22 Add new version Pulley knob
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