URSA - Gearbox/Differential Tweeks

thingiverse

I printed out the URSA BEAR over the last few weeks. I just finished putting it all together, and have been fixing issues I've ran into as I go. My bearings were coming free, so I added a cage. My servos didn't line up to the holes, so I moved them 2mm over. Then my gears were slipping/not meshing nicely, so I widened the area around the main gear 1mm on the sides, to accommodate the 29T modified differential main gear. (I experienced slipping and teeth grinding with the stock GB03 differential, which the person who made the 29T gear had noted as well. I included the 29T gear into this project, so everything is all together.) UPDATE ON SLIPPING: I discovered the source of most of my issues: I didn't have any bearings in the differential, on the main axles. Just the 2 in the spindles. My input shaft to the gearbox only had 1 bearing too. After adding a second bearing there, and the 1 on either side of the axles, my gearbox meshes together much better. I've also included the mod where I've merged the shock mounts into my current gearbox variation. So this mod includes: 1) Gearbox Input shaft - outer bearing brace 2) 2mm left shifted holes for the servo mount - the servos I had didn't line up 3) Widened gear area, to give space for larger/more teeth/lower gears. The 29T fits nicely in the modified/wider area gearbox. 4) Shock mounts added/merged from another design (sorry, I can only tag one thing for remix) 5) The 29T Differential gear 6) 10mm longer differential support 7) Modified/fixed ball mount for the top of the diff 8) 4mm longer CV Drivetrain axle (for the CV mod) 9) Modified CV Stub Output Axles - longer output shaft (3mm longer i think) 10) Modded Wheel nuts - 15mm total offset, and 3mm deeper hex hole to pair with the modified CV stub output axles