To set the spacing of the gears, first slip a bevel gear onto the motor shaft, and then temporarily install the main shaft and its bevel gear. If they turn out to be necessary, it will be trivial to add them simply by drilling the holes a bit larger.īecause when you press the spacer over the knurling on the original shaft it may slightly bulge it larger than the 6mm OD it originally had, you may need to very slightly drill out one of the bevel gears so that it easily fits over the shaft. It's likely that with this plastic no bearings will be necessary. The holes in the 3D printed part are deliberately undersized, so next I drill them out to accept the shafts with a perfect fit. You want to drill it out just slightly smaller than the knurling on the original shaft.Īfter it is drilled out, we can use a bench vice to easily press the shaft over the spline on the original shaft. But to make it fit we have to drill it out. Next I found some 6mm OD x 45mm spacers, which can be used to lengthen the stock Heng Long shaft. Then we can finish driving the shaft out using a small punch. We can start moving it by using a pair of pliers to bear against the side of the gear, and tap it off the spline. Then we need to remove the gear pressed onto it.
I am able to salvage the main shafts from the original Heng Long transmission to save on cost and ease manufacturing.įirst, we remove the main shaft from the original Heng Long transmission: This way you do not have to modify your tank at all to use this transmission.
I revised the design to lighten the frame and use less plastic, making it faster and cheaper to print.Īlso, I angled the motors slightly so that they do not interfere with some of the old mounting and alignment holes for the original transmissions.
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