ServoCity Product Info: ServoBlocks™ 

Servos have different styles of internal support for the splined output shaft. On the low end, they just use the case to hold the shaft. The next step up would have a bushing pressed into the case to support the output shaft. The higher end servos will have ball bearings; some have one while others have an upper and a lower bearing. The style of support is relative to the torque output of the servo. When you connect a regular horn to a servo there are two areas that have potential for flex. 1) The potential for flex in the servo horn (piece attached to the splined output shaft of the servo). Many horns are molded and the plastic can be distorted and even break if a heavy enough load is applied. The ServoBlock output shaft is constructed from 7075 aluminum which is considerably stronger than any load that will be applied to a servo. 2) The potential for movement between the splined output shaft and the servo horn. We hold very tight tolerances to make sure the fitment between the servo horn and the splined output shaft is perfect. If the broach is incorrect this can cause the shaft to move when a load is applied. Other horns rely on a clamp, collar or other type of mechanism to hold the horn onto the servo. We have designed the part to be used in conjunction with the stock servo screw - once the screw is installed the splined output shaft is solidly mated to the horn. 3) The potential for the internal support mechanism for the splined output shaft of the servo to be overloaded. The ServoBlock uses a .5” diameter bearing spaced out away from the top of the servo case to isolate almost any side load (radial load) from being applied to the servo itself. Please let us know if you have any other questions! tech@servocity.com

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