You're probably best including a photo, CAD drawing, or atleast a concept pencil sketch with some dimensions marked. How thick is the cord, what diameter has the reel, how much force will the thing be experiencing...
Also, do you have access to a 3d printer? Virtually all the solutions I can imagine will need atleast some 3d printed brackets to hold things in the correct relative orientations.
This https://hackaday.com/2019/08/21/automat ... -a-breeze/ may give you inspiration, to my understanding you're looking to build one of those, but have a linear actuator purposeully move the "blue string guide" back and forth, rather than have it done by a mechanical system following from the reel's rotation?
You could always replace the orange "reversng screw" rod with a big bolt, mount the "blue string guide" on a nut on the bolt, and have the bolt rotated by a "micrometal" gear motor. These motors usually have a gearbox which increases torque (ratios around 298:1 are good), although the gears are small and risk losing teeth if over-torqued or subject to shock or lateral forces on the shaft. These motors have a convenient backshaft on which to mount a disc with magnets in it, and track this with a relative position quadrature rotary encoder.
Also, do you have access to a 3d printer? Virtually all the solutions I can imagine will need atleast some 3d printed brackets to hold things in the correct relative orientations.
This https://hackaday.com/2019/08/21/automat ... -a-breeze/ may give you inspiration, to my understanding you're looking to build one of those, but have a linear actuator purposeully move the "blue string guide" back and forth, rather than have it done by a mechanical system following from the reel's rotation?
You could always replace the orange "reversng screw" rod with a big bolt, mount the "blue string guide" on a nut on the bolt, and have the bolt rotated by a "micrometal" gear motor. These motors usually have a gearbox which increases torque (ratios around 298:1 are good), although the gears are small and risk losing teeth if over-torqued or subject to shock or lateral forces on the shaft. These motors have a convenient backshaft on which to mount a disc with magnets in it, and track this with a relative position quadrature rotary encoder.
Statistics: Posted by Infraviolet — Sat Jan 13, 2024 4:32 am