Gearbox upgrade Herringbone/Helical smooth transmission

thingiverse

This a remix of the two gears in the original Staind tank and of the remixed track wheel found in the link below to improve the sound level and more importantly the smoothness of the gearbox, same ratios but motor to gear transmission is switched to herringbone and the gear to wheel transmission is helical since the difference in assembly from one tank to another will produce slightly different space between track wheel and gear box so a herringbone might not work here but still both offer better smoothness because there is always at least one tooth to tooth contact in rotation, seemed to be working great in my tests but have to keep testing to see the effect on longevity links for remixed improved wheel: https://www.thingiverse.com/thing:2743302 Thanks Andre for your great work !