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The link to the dog leash is missing. The iiMash encoder hasa rod that could support axial forces and possibly shear forces, I have doubtsabout the cheaper one. Since the forces applied by the reel are quitesignificant I definitely recommend the iiMash.Firstly, drill a hole in the housing of the dog leash to connectthe housing of the encoder. In case of the iiMash encoder, four holes (one forthe rod and three for the connecting screws). Next, it might be possible todrill a press fit in the reel to connect the rod to the reel. In any other caseyou need to search for an appropriate coupling.I hope this helps
Well, that really depends on the encoder you use. Probably youneed an axle/rod to connect the encoder to the reel of the dog leash. If yousend me a link of the encoder, I can think of specific suggestion to solve theissue.
you can buy a badge reel at most office supply (web)stores. Depending on your application a retractable dog leash might be perfect. In my case a dog leash would have been too big. If you only need velocity, an encoder is perfect. If you never worked with encoders, this will require some time getting used to. There should be able to find some madlab or Arduino tutorials for this.
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