Since the small Tamiya hubs don't fit on the servo ends, you'll need to drill them to size. Whatever screw you use that fits in the servo spline, drill the hole to fit. You may be using the hub screw that came with the servo.
This can be done with a hobby knife saw or a coping saw. Be careful you don't slash your hand! For safety I held the hub on a cutting board on its side with my fingers on the other side of the wheel from the stem, and then I rotated it against the cutting board dragging the knife along it, this way if you slip you just hack the board.ĭrill the hole for the bolt that will hold it on to the servo in the cap of the drive wheel (the wheels with teeth).
Use some angle cutters or pliers to remove any mounting flanges from the cases and file or sand down the ridges they leave, these can get in the way later.Ĭut the stems on the hubs so that they just stick past the inner edge of the tracks when installed. (not shown) Before you close up, put a hole in the back part of the case opposite the spline to mount the idler (wheel with no teeth). For the servo that will go on the front, cut a notch for the wire to exit through the side so it doesn't come from under the robot. Solder on the resistors, if you used the pair of through hole ones, I recommend bundling them in electrical tape like so. If you have surface mount resistors, place a 5k (1k to 10k should work) on the pad from each of the side pads to the middle pad, if you don't twist a pair of through hole resistors like thisīreak out the stop on the potentiometer with some small pliers, you need the pot for its use as a rotational bearing But here is how I did it for the micro 9g servos I am using.Ĭut the potentiometer wires, these are where you will attach the resistors
They give you so much of the hardware the motors, the gearbox, the driver and control circuitry, all in a tiny cheap package, and in this implementation they also act as the frame of the robot (seen in the next step). There are many instructables on modifying servos for continuous rotation. Micro servos modified for continuous rotation are the heart of this design.
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