Sky Watcher Collapseable Dobsonian goto OnStep Telescope

thingiverse

Make your sky watcher goto + track for around $200A hybrid of many of the onstep projects but without having to cut a larger hole in the base of the sky-watcher.Parts needed:onstep board: in my case a fsyetc e4 - preprogrammed https://graydigitalarts.com/shop/ two 1:100 planetary steppers Nema17, https://www.amazon.com/gp/product/B00QEWAL98/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1various m3 to m6 bolts https://www.amazon.com/gp/product/B07CYGD9XK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 and https://www.amazon.com/gp/product/B0CCP4VWZN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=16s2p batterygt2 belt 9mm Zeelo brand from amazon, https://www.amazon.com/gp/product/B0BYVCJVFQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=190mm M10 1.5 bolt and nuts (Lowes)12" lazy susan Steps:print all the parts, make sure torque sensitive parts are 100% infill, the strength and rigidity is importantdisassemble your sky-watcher base bottom disk and top main assembly from each other by unscrewing the 10mm bolt and nutinstall the 90mm 10mm bolt in the below base plate torque bracketscrew in the bracketslide the bushing over the boltinstall the lazy susan centering ring in the lazy susan, https://www.lowes.com/pd/Richelieu-Swivel-Plate-360-Degree-in-Galvanized-Steel/1000818576install the lazy susan on top of the base plateslide the above base plate spacer over the bolt, above_base_torque_spacer.stlslide the top of the telescope mount over the bolt/spacerinstall nut on bolt and torqueinstall the 300tooth gear on the boltadd and tighten nut on top of gear and make sure the gear is rigidly attached to bolt otherwise you will have excessive backlash in azimuth movementsmake sure the base can spin freel - Here's the stack of the pieces:nutwasher300 tooth gearnutbase of top assemblytorque spacerlazy susan ring in lazy susanbase plate with bushing insidebelow base torque spacer screwed into base plate tightly10mm bolt through allinstall steppers into clamping bracket and the rigid nema bracket installed on claming bracketinstall 25 tooth and 24 tooth gear onto steppers for altitude and azimuth respectivelyscrew in "ear" bracket to basemake the right length belt by splicing a belt using rubber cement (search gt2 splicing for how to)remove the right side spacer on telescope body and install gear on scope body add 10mm nut first to gear before installuse the gt2 belt coupling i3_Y_belt_holder_01.STL to create the right size belt for tension on alt and the right orientation of the motor bracket attached to ear (see this video as inspiration https://www.youtube.com/watch?v=KCvG_8NTk9I&ab_channel=AlexM)connect to onstep and use the image of the calculator for starting values