Tank Track, Worm Gear Drive Cases

thingiverse

These upgraded gear cases feature a sleek new design, now listed on Thingiverse #2694014. Pair these cases with your Tank Track 2in and other favorites from my shop. Introducing the Worm Gear Drive Cases and Covers, perfectly designed for a Kyosho RFW002/RF006 High Speed Worm Gear Set from the Rock Force Kyosho Crawler. The included Kyosho gear boasts a robust shaft diameter of 6mm (0.235"). To match, ServoCity offers readily available 6mm shafting. You can fit these cases with either 5/8" or 16mm OD bearings, ensuring versatility and dependability. These gear cases work beautifully in both tanks and robots, thanks to their rugged design and precision engineering. This is the second iteration of these gear cases, featuring a larger back bearing on the worm. The upgrade came about after experiencing issues with overheating when using Mabuchi RS 540 motors; the small bearing on previous designs wasn't able to withstand the heat and thrust from the velineon brushless motors. However, I've upgraded this new design to accommodate larger bearings that can handle increased stress and wear due to weight or load on the gearbox. This results in a longer lifespan for your tank's gear system. The angle brackets required to complete the installation are readily available from National at 3/4"x1 1/2" metal. They fit neatly into the corners of the frame but do necessitate some drilling. To build these gear cases, you'll need (1) a 6x15x5 MR696-2RS bearing and another identical for the worm; (1) two 6x16 bearings for the axles. Lastly, secure your gear case in place with 4 x 3/8" sheet metal screws and another set of 4 x 1/2". Special care is needed to mount a unique 6mm hub on the spur gear that will connect directly onto the worm's input shaft. You can find such a hub at Photoshipone. Their products also include 5-40 threaded fasteners, ideal for pairing with Kimbrough-type spur gears. When combining this setup with your choice of motor and gearing system, consider utilizing either a 60-66 or 48P tooth gear ratio to provide ample flexibility in gearing options. This specific Kyosho worm gear set has a native rating of 30T with a ratio that results in an astonishing 15:1. For better performance on Mabuchi motors, you may use 24-66 teeth while the velineon motors work efficiently with 33-66 gear sets. Accurate alignment is essential; it can be easily achieved by aligning one end of the worm in the case. Use a few nylon washers for adjustments if necessary, which should place the worm dead center on its target and improve your drive ratio accordingly. Always remember to run grease on all the parts to achieve perfect operation. For individuals working with a Sabertooth 2x12 that wishes to place it in between the cases while still retaining full performance from their spur gear; note that this action may require a minor trimming of the fin portion, just to avoid interfering directly onto spur gears and allow clear function at your desired operating speeds. Instructions: First things first: You need to line up the Worm drive so that the gear on either end has space around the outside. Once in place run some small amount (one) nylon washers between one of each case. Make sure to drill out the screw holes until right size for #4 screws .089-.093" to avoid breaking through case with screw head on inside part. Once you have the bearing cases installed and lined up with spindles go in easy because that hole needs no supports. Lastly: make note if a fin was placed around edge (if any fins). If not remove this, do NOT leave loose parts attached, since tank runs best smooth