Retraction Mechanism for threaded nut

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Various retraction mechanisms for a threaded nut are being explored, particularly given the constraints of a maximum 6 mm space and a 2 mm forward movement on the shaft. A suggested solution is the use of a "half-nut," similar to those found in thread cutting lathes, which can effectively engage and retract from the threaded shaft. The discussion emphasizes the need for innovative designs that accommodate limited geometry while ensuring functionality. Participants are encouraged to share additional ideas or mechanisms that fit within these constraints. Overall, the focus remains on finding practical solutions for the retraction of the nut in a confined space.
shishir.iitr
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Hi,

I have been trying to find all the retraction mechanisms possible to bring the nut back on the threaded shaft when it comes forward. Constraint is geometry. Between the back of nut and the face of the threaded shaft, space is max. 6 mm. also, the nut moves only 2 mm forward on shaft. Please help.
 

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