Adapting GS-280 (old GSO) EQ telescope mount to [OnStep goto controller](https://groups.io/g/onstep/wiki/home) , by Howard Dutton project. ###Accessories recommended * [OnStep Controller and Box](https://www.thingiverse.com/thing:4057270) on base STM32 Blue Pill * [OnStep SHC](https://www.thingiverse.com/thing:3212339) Smart Hand Controller * Alternative [OnStep Mini 2.0 Cotroller and Box](https://www.thingiverse.com/thing:3404139) on base MiniPCB2 and Teensy3.2 ###BOM 2x JKM NEMA17 42BYGHW609 1.8 Degree Stepper Motor 40mm 1.7A 2x GT2 Timing Belt 6mm wide 2mm pitch 170mm-2GT 85teeth 2x GT2 Timing Pulley with 16 Teeth and Bore 5mm for 6mm belt 2x GT2 Timing Pulley with 60 Teeth and Bore 8mm for 6mm belt ( 16x M3x10mm Inbus screw 2x M4x20mm Hex Head screws 2x M4 wing nuts 2x M4 Assortmen 18x 2x6mm self-tapping screws 2x [RA and DEC PCB](https://easyeda.com/hujer.roman/ra_and_dec_pcb) 2x RJ14 6P6C Right Angle PCB Jacks 2x JST B4B-XH-A socket 1x 3mm Red LED ###OnStep 4.x Config for TMC2130 drivers (Vref=2.5V)

//AXIS1 RA/AZM

#define AXIS1_STEPS_PER_DEGREE 19200.00000 // 144t x 60/16 x 200 x 64/360,

#define AXIS1_STEPS_PER_WORMROT 48000

#define AXIS1_DRIVER_MODEL TMC2130_QUIET

#define AXIS1_DRIVER_MICROSTEPS 64

#define AXIS1_DRIVER_MICROSTEPS_GOTO OFF

#define AXIS1_DRIVER_IHOLD 300 // (mA.)

#define AXIS1_DRIVER_IRUN 1400 // (mA.)

#define AXIS1_DRIVER_IGOTO 1680 // (mA.)

#define AXIS1_DRIVER_REVERSE OFF

#define AXIS1_DRIVER_STATUS TMC_SPI

//AXIS2 DEC/ALT

#define AXIS2_STEPS_PER_DEGREE 16000.00000 // 120t x 60/16 x 200 x 64/360

#define AXIS2_DRIVER_MODEL TMC2130_QUIET

#define AXIS2_DRIVER_MICROSTEPS 64

#define AXIS2_DRIVER_MICROSTEPS_GOTO OFF

#define AXIS2_DRIVER_IHOLD 300 // (mA.)

#define AXIS2_DRIVER_IRUN 1400 // (mA.)

#define AXIS2_DRIVER_IGOTO 1680 // (mA.)

#define AXIS2_DRIVER_POWER_DOWN OFF

#define AXIS2_DRIVER_REVERSE OFF

#define AXIS2_DRIVER_STATUS TMC_SPI

#define AXIS2_TANGENT_ARM OFF

####NOTE * Use the M3 thread mask for drill 2.5mm holes to cut the M3 thread in the original auger holders. * FreeCAD sources on [Github](https://github.com/romanhujer/OnStep-for-Seben-EQ3-mount/) ####Another recommended link: * [3D printed - Small Travel EQ telescope mount](https://www.thingiverse.com/thing:3327081) * [OnStep for SEBEN EQ3 mount](https://www.thingiverse.com/thing:2476084) * [OnStep for EQ5 (SkyWatcher) mount](https://www.thingiverse.com/thing:4170058) * [My all desing for Astronomy telescope ](https://www.thingiverse.com/RomanHujer/collections/astronomy-telescope)

Found 1 3D-models for “GS-280” across many websites

OnStep for GS-280 (old GSO) EQ telescope mount