EQ telescope mount II. for OnStep goto controller

thingiverse

<b>IMPORTANT UPDATE:</b> The latest version is now available! <a href="https://www.thingiverse.com/thing:3327081">Get it here</a> This EQ mount II is perfect for small telescopes or DSLR cameras, designed specifically for use with the OnStep goto controller. Want to know how to make it? Check out my video tutorial on YouTube <a href="https://youtu.be/Dmi01grPYCI">here</a> You can access the FreeCAD sources on GitHub at <a href="https://github.com/romanhujer/Small-EQ-mount-OnStep/blob/master/eq-mount-V1.2.FCStd">this link</a> This EQ mount uses two of my Planetary gearboxes with a 1024:1 ratio, available on Thingiverse <a href="https://www.thingiverse.com/thing:2586962">here</a> For more information about the OnStep goto controller, visit Howard Dutton's project at <a href="http://www.stellarjourney.com/index.php?r=site/equipment_onstep">this link</a> or check out the OnStep News group on groups.io You may also want to consider my OnStep Controller Box, designed for use with an Arduino Mega2560 board, available on Thingiverse <a href="https://www.thingiverse.com/thing:2748375">here</a> Here's a snippet of code you'll need to configure your OnStep controller: ``` // Axis1 is for RA/Az #define StepsPerDegreeAxis1 12288.0 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // NEMA17 + PLANET : 200 * 16 * 27/20 * 1024/360 = 12288.0 // Axis2 is for Dec/Alt #define StepsPerDegreeAxis2 12288.0 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // NEMA17 + PLANET : 200 * 16 * 27/20 * 1024/360 = 12288.0 // PEC, number of steps for a complete worm rotation (in RA), StepsPerDegreeAxis1*360)/gear_reduction2. Ignored on Alt/Azm mounts. #define StepsPerWormRotationAxis1 4320L // NEMA17 + PLANET : (12288*360)/1024 = 4320 ``` You may also want to check out these recommended links: * My OnStep ST4 Handheld controller <a href="https://www.thingiverse.com/thing:2626117">here</a> * My DIY Telescope <a href="https://www.thingiverse.com/thing:2610531">here</a> * Wood tripod upgrade for telescope with Eyepiece plate <a href="https://www.thingiverse.com/thing:2670699">here</a> * My OnStep for Seben EQ3 mount <a href="https://www.thingiverse.com/thing:2670699">here</a> Remember to fill the weights with stones and cement!