Small Travel 3D printed OnStep EQ mount for telescope

thingiverse

It is new version 3D printed OnStep EQ telescope compact mount for [OnStep goto controller](https://groups.io/g/onstep/wiki/home), now use [17HS19-1684S-PG100](https://www.omc-stepperonline.com/nema-17-stepper-motor-bipolar-l48mm-w-gear-raio-1001-planetary-gearbox-17hs19-1684s-pg100.html) Nema 17 Stepper Motor with 99.05:1 Planetary Gearbox or [17HS15-1684S-HG100](https://www.omc-stepperonline.com/nema-17-stepper-motor-l39mm-gear-raio-1001-high-precision-planetary-gearbox-17hs15-1684s-hg100.html) Nema 17 Stepper Motor with 100:1 High Precision Planetary Gearbox (recommended for astrophotography) Only RA axis can use for longtime astrophotography (Tracking speed is Sidereal, Lunar, or Solar) * FreeCAD sources on [Github](https://github.com/romanhujer/Small-EQ-mount-OnStep/blob/master/eq-mount-V1.4.FCStd) * RA and DEC PBC design is on [EasyEDA](https://easyeda.com/hujer.roman/3d-eq-mount) * [My OnStep Mini 2.0 box](https://www.thingiverse.com/thing:3404139) on base [MiniPCB2](https://easyeda.com/hdutton/minipcb2) and Teensy3.2 with drivers TMC2130 for 32 or 128microstep or * [My OnStep Controller Box](https://www.thingiverse.com/thing:2748375) for on Arduino Mega2560 board with drivers DRV8825 for 32microstep * [Demo video](https://youtu.be/tVlYURu9AsQ) * Astrophotography gallery from this mount is [here](https://www.zonerama.com/RomanHujer/Album/5086283) #### BOM 16x M3x10mm screws 4x M5x60mm screws 1x M6x400mm threaded rod 10x 2.5x8mm self-tapping screws 20x 2x6mm self-tapping screws 6x M3 nuts 4x M6 nuts 4x M5 wing nuts <B>For HG100 High Precision Gearbox</B> 8x M4x10mm imbus screw 8x M4 Assortmen <B>Optional for metal Clamp</B> 2x [QR-50 Quick Release Plate Clamp Mount Compatible For Arca SWISS](https://www.ebay.com/itm/QR-50-Quick-Release-Plate-Clamp-Mount-Compatible-For-Arca-SWISS-Tripod-Ball-EL-/303142913398) 2x Metal clutch see [Metal-clutch.pdf](https://cdn.thingiverse.com/assets/0e/31/ac/e8/77/Metal-clutch.pdf) or Aluminum Shaft Coupler Bore Diameter: 5-8mm, DxL: 14x25mm and print [key-clutch.stl](https://www.thingiverse.com/download:7328594) <B>Optional for Polar scope holder</B> 1x [Skywatcher HM5 Polar Alignment Scope](http://skywatcher.com/product/polar-scope-heq5eq3/) 1x Red Led 3mm 1x 50K Ohm 3296W Trimmer 1x Baterry 3V CR2016 (CR2025, CR2032) 3x M3x10mm screw 3x M3x25mm screw 2x 2.5x8mm self-tapping screws (use a M3 tap to create a thread for screw) <img width=150 src=https://cdn.thingiverse.com/renders/12/cc/68/95/84/ce5d00e0901f935b1fd235e0ed7373a0_preview_featured.jpg> I recommend using this [right angle adapter](https://www.thingiverse.com/thing:3116030) for the polar viewfinder <B>Optional for Metal Weight</B> * [DOMYOS CAST IRON WEIGHT TRAINING DISC WEIGHT 28MM 0.5 Kg](https://www.decathlon.co.uk/28mm-cast-iron-weight-bar-discs-body-training-id_1042303.html) * M6 nuts ####OnStep config.XXX.h <b>For 128microstep HG100 100:1 High Precision Planetary Gearbox </b> <pre> // Axis1 is for RA/Az // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // 17HS19-1684S-PG100: 200 * 128 * 1 * 100 / 360 = #define StepsPerDegreeAxis1 7111.1111111 // Axis2 is for Dec/Alt // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // 17HS19-1684S-PG100: 200 * 128 * 1 * 100 / 360 = 7111.1111111 #define StepsPerDegreeAxis2 7111.1111111 // PEC, number of steps for a complete worm rotation (in RA) // calculated as : (StepsPerDegreeAxis1*360)/gear_reduction2. // 17HS19-1684S-PG100: (7111.1111111*360)/100 = 25600 #define StepsPerWormRotationAxis1 25600L </pre> <b>For 128microstep PG100 99.05:1 Planetary Gearbox </b> <pre> // Axis1 is for RA/Az // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // 17HS19-1684S-PG100: 200 * 128 * 1 * (99+104/2057) / 360 = 7043.59531 #define StepsPerDegreeAxis1 7043.59531 // Axis2 is for Dec/Alt // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // 17HS19-1684S-PG100: 200 * 128 * 1 * (99+104/2057) / 360 = 7043.59531 #define StepsPerDegreeAxis2 7043.59531 // PEC, number of steps for a complete worm rotation (in RA) // calculated as : (StepsPerDegreeAxis1*360)/gear_reduction2. // 17HS19-1684S-PG100: (7043.59531*360)/(99+104/2057) = 25600 #define StepsPerWormRotationAxis1 25600L </pre> <b>For 32microstep PG100 99.05:1 Planetary Gearbox </b> <pre> // Axis1 is for RA/Az // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // 17HS19-1684S-PG100: 200 * 32 * 1 * (99+104/2057) / 360 = 1760.89883 #define StepsPerDegreeAxis1 1760.89883 // Axis2 is for Dec/Alt // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360) // 17HS19-1684S-PG100: 200 * 32 * 1 * (99+104/2057) / 360 = 1760.89883 #define StepsPerDegreeAxis2 1760.89883 // PEC, number of steps for a complete worm rotation (in RA) // calculated as : (StepsPerDegreeAxis1*360)/gear_reduction2. // 17HS19-1684S-PG100: (1760.89883*360)/(99+104/2057) = 6400 #define StepsPerWormRotationAxis1 6400L </pre> #####NOTE: * For correct motor direction install JST XH socket for RA axis in [PCB](https://easyeda.com/editor#id=22dfa60122774ee6997a1f6e92982046|06876d71e98b41729afbdade53b6b3eb) with reversed pins: <img width=400 src=https://cdn.thingiverse.com/renders/69/b6/1f/3c/a0/6b62a2e8266bae906eb50bc9166e9f58_preview_featured.jpg> * RA and DEC Clamp is very critical thing. For print use ABS with 100% infill or create from metal (recommended for heavy telescope). * Use stones and cement to fill the weights or create from metal. <img width=400 src=https://cdn.thingiverse.com/renders/30/1d/c9/f8/6f/574e4b9ae9d2f9dc72126a02812d79cb_preview_featured.jpg> * Use acetone glue to attach the holders to the metal weights <img width=400 src=https://cdn.thingiverse.com/renders/66/44/d6/0d/bc/332312ecd2b8b1805fbe25a0deabca30_preview_featured.jpg> * Use a tap to create a 1/4"-20 UNC thread in Aluminum Shaft Coupler <img width=400 src=https://cdn.thingiverse.com/assets/7d/81/1d/6d/7f/featured_preview_key-cluch.jpg> #####Old version: * [2018](https://www.thingiverse.com/thing:2748281) * [2017](https://www.thingiverse.com/thing:2636470) #####Another recommended link: * [OnStep SHC (Smart Hand Controller)](https://www.thingiverse.com/thing:3212339) * [OnStep ST4 Handheld controller](https://www.thingiverse.com/thing:2626117) * [OnStep for Sky-Watcher EQ5 mount](https://www.thingiverse.com/thing:4170058) * [OnStep for SEBEN EQ3 mount](https://www.thingiverse.com/thing:2476084) * [My DIY Telescope](https://www.thingiverse.com/thing:2610531) * [Wood tripod upgrade for telescope with Eyepiece plate](https://www.thingiverse.com/thing:2670699) <b>Update:</b> * 2019-01-05 Add RA and DEC [PCB](https://easyeda.com/editor#id=06876d71e98b41729afbdade53b6b3eb) Box for new wiring version on [MiniPCB2](https://easyeda.com/hdutton/minipcb2) or [MaxPCB2](https://easyeda.com/hdutton/maxpcb2) * 2019-01-20 Add BOM for screws and nust * 2019-02-04 Add link for new [My OnStep Mini 2.0 box](https://www.thingiverse.com/thing:3404139) * 2019-05-16 Add support for [17HS15-1684S-HG100](https://www.omc-stepperonline.com/nema-17-stepper-motor-l39mm-gear-raio-1001-high-precision-planetary-gearbox-17hs15-1684s-hg100.html) and some metal parts * 2019-06-25 Add HM5 polar scope holder * 2019-07-15 Add Metal Weight Holders * 2019-07-17 Add new DEC_PCB_Box_For_MiniPCB2_V2 better to use with Metall Weight * 2019-08-16 Add RA_Polar_Finder_Clamp_V2 * 2019-11-30 Add another metal clutch - Auminum Shaft Coupler with printed key