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The previous function moves 180 degrees x 2 = 360 degrees, but always in the same direction, and makes an offset of a couple of degrees from the home position.
Now if moving forward and backward, as specified by the OP, then the offset from home position is more than a couple of degrees (for ten repetitions). The reason is "black lash", as explained below.
The OP's motor has no gear, therefore no backlash problem. If he uses gear, then he has the back lash problem. As explained by the Oriental Motor, one way to prevent backalsh is to use stepper motor. Another workaround is to advance "a little bit first" when reversing the direction, so to compensate the backlash slack. However, the backlash magnitude might depend on the gear assembly, therefore not a good solution.
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