Requirements for linear motion miniature applications range from filling syringes through to medical devices, or robotic applications used in the operating theatre. The first consideration for a design engineer is the method used to transfer the rotary motion of a miniature motor into linear motion. The most common way of achieving this is by mounting a screw and nut system on the motor shaft. It operates on a rolling contact between the nut and a screw, which can provide low friction, good efficiency, and high load capability. The disadvantages, however, are the cost and the time to design such a solution, especially for applications that don't require high load handling.
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