Elektronic focuser for Newton or Refractor with 2" dual speed Crayford 1:10

prusaprinters

Elektronic focuser with NEMA17 for Newton or Refractor with 2" dual speed Crayford 1:10 for OnStep telescope goto controller or my Focuser Hand Controller (FHC). Wiring diagram and PCB on EasyEDA FreeCad source code on GitHub 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 Option I - For main 40 Teeth Pulley V1 3x M4 Grub Option II - For main 40 Teeth Pulley V2 (Recommended for use) 1x Aluminum Shaft Coupler Pore Diameter: 4-5mm, DxL: 14x25mm 2x M4x6mm imbus screew Option III - For metal main 40 Teeth Pulley 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 Option IV - For Cluch - 3D printed Shaft Coupler 6x M3x20mm screws 6x M3 nuts Option V - For 3D printed 18 Teeth Pulley 2x M3x20mm screws 2x M3 nuts NOTE: My Focuser Hand Controller (FHC) is on Thingiverse Wiring diagram and PCB on EasyEDA Firmware and FreeCAD sources on GitHub Update: 2019-03-11 Add Refractor version 2019-11-22 Add new version Pulley knob Category: DIY