3D printed - EQ telescope mount with OnStep goto controller

NOTICE: The new version now released!

EQ mount for small telescope or DSLR with OnStep goto controller.

How to this working? See my video: https://youtu.be/2uIM-Aml7Mk

FreeCAD sources on Github

EQ mount used 2x My Planetary geerbox 1024:1

More info about OnStep goto controller on Howard Dutton project

OnStep config.h

For NEMA17 40mm 200 steppers motors:

// Axis1 is for RA/Az #define StepsPerDegreeAxis1 9102.22222 // calculated as : stepper_steps* micro_steps* gear_reduction1* (gear_reduction2/360) // NEMA17 + PLANET : 200 * 16 * 1 * 1024/360 = 9102.22222

// Axis2 is for Dec/Alt #define StepsPerDegreeAxis2 9102.22222 // calculated as : stepper_steps* micro_steps* gear_reduction1* (gear_reduction2/360) // NEMA17 + PLANET : 200 * 16 * 1 * 1024/360 = 9102.22222

// PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1360)/gear_reduction2. Ignored on Alt/Azm mounts. #define StepsPerWormRotationAxis1 3200L // NEMA17 + PLANET : (9102.22222360)1024 = 3200

For NEMA17 40mm 400 steppers motors:

// Axis1 is for RA/Az #define StepsPerDegreeAxis1 18204.44444 // calculated as : stepper_steps* micro_steps* gear_reduction1* (gear_reduction2/360) // NEMA17 + PLANET : 400 * 16 * 1 * 1024/360 = 18204.44444

// Axis2 is for Dec/Alt #define StepsPerDegreeAxis2 18204.44444 // calculated as : stepper_steps* micro_steps* gear_reduction1* (gear_reduction2/360) // NEMA17 + PLANET : 400 * 16 * 1 * 1024/360 = 18204.44444

// PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1360)/gear_reduction2. Ignored on Alt/Azm mounts. #define StepsPerWormRotationAxis1 6400L // NEMA17 + PLANET : (18204,44444360)/1024 = 6400

Another recommended link:

• My OnStep for Seben EQ3 mount
• My OnStep ST4 Handheld controller
• My DIY Telescope

NOTE:

Use stones and cement to fill the weights.

Category: DIY