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Consider a machine for converting rotational motion to rectilinear translation, such as a crank slider or scotch yoke.

When the slider is at either of its two translational extremes (where the crank center, crank joint, and slider joint are all in a line), the machine is stable in the sense that applying a force on the slider (in the direction of the slider) does not result in any torque on the crank.

My question is: Is there a machine that converts rotational motion to rectilinear motion where the machine is stable (in this sense) when the slider is between its translational extremes?

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    $\begingroup$ "stable (in this sense) when the slider is between its translational extremes" The more straightforward way to word this is to simply describe it as something a rotary to linear motion converter that cannot be back driven. A leadscrew will do that. $\endgroup$
    – DKNguyen
    Commented Mar 16, 2023 at 3:39
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    $\begingroup$ What machines have you considered so far so we don”t duplicate your efforts made already. $\endgroup$
    – Solar Mike
    Commented Mar 16, 2023 at 4:14

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