URSA Bear CVD Axle input rework

cults3d

zxcvbn did an outstanding job crafting CV joints for the URSA Bear truck; however, I found the tolerance to be excessively loose on certain parts. This results in excessive play between gears, which can lead to damage to the Bevel Gears on the input shaft. The gears may also jam and cause the axle case to split the top cover. This rework achieves four main objectives: 1) It tightens the tolerance of the input shaft bearings back to 11.9mm, matching tahustvedt's tolerance on the original shaft and ensuring a snug fit for the bearings. This stops the wobbling that occurs due to excessive play. 2) I decreased the backlash between the bevel gears by .1mm to further tighten them up and increase gear face mesh together, preventing skipping and broken tooth damage. 3) Two rings are added to the input shaft around the 1.75-2mm shaft for the CV Joint, allowing you to install the pin and then add an R-09 O-ring over the top to prevent it from falling out if loose. You can also use anything that fits tightly over the pin, such as a rubber band looped several times or super glue; the extra o-ring is optional. R-09 O-Ring: ID 1/2" OD 11/16" Section 3/32" 4) Zero tolerance is achieved between the Bevel gear Hex shaft and CV input body. This requires a little hammering to install the bevel gear, but it eliminates play completely. If your printer is well-tuned, you should be able to assemble these parts with ease; remember to install the 2 bearings first on the CV body input shaft, then install the bevel gear and hammer it into place. This helps remove as much play as possible between the input and counter gear, resulting in a stronger gear mesh.