It seems like you replicated the blueprint in the screenshot which I took from the Unreal documentation. This should not be necessary, the screenshot was more meant as an example. Actually, you should only need the “Input Axis X_AXIS” node and wire its Axis Value output (the float) to where the random float generator you mentioned was. You said you already got the arm to move with the float from a random number generator. Only this float needs to be replaced by the float from your Input Axis X_AXIS node.