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I'm considering a potential product but I'm not sure about the core technology I'd need.

The fundamental idea is that there would be a cable (or something similar) that would be pulled. But as it was pulled with X force, the device (mechanically and/or electronically) would provide equal (but slightly less) resistance.

So if it's pulled with 10 pounds, it would respond with (for example) 9 pounds of resistance (so the net result would the cable moving at 1 pound pressure).

But it would also need to react in real-time (more or less instantly), as the pull force would be constantly changing.

Is there already some kind of device that does that I'm not an engineer, more on an entrepreneur, so I'm a bit out of my depth here. Thanks!

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  • $\begingroup$ This appears confused: "cable moving at 1 pound pressure" means at the acceleration correpsonding to this force, correct? What other masses (aside from the cable) come into play? what is the ultimate goal? $\endgroup$
    – mart
    Sep 3 '20 at 9:37
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You can wind your cable around a flywheel connected to a shaft rotating a fan in a high viscosity grease. Like an automatic transmission.

Geared to correct proportion. This mechanism is basically a friction machine but doesn't create much wear and tear.

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  • $\begingroup$ Interesting concept, but I would think that would introduce inertia (aka, if it was pulled really hard it would then coast for some time)? $\endgroup$
    – Alex Gold
    Apr 7 '20 at 18:20
  • $\begingroup$ If your convertor has stators in it, it won't. going back to the example of an automatic transmission, there is not much slip and slackness, or delayed response. $\endgroup$
    – kamran
    Apr 7 '20 at 18:27
  • $\begingroup$ Ah, that makes sense. Thanks, I'll look into this more! $\endgroup$
    – Alex Gold
    Apr 7 '20 at 20:16
  • $\begingroup$ minor nitpick: This device would not react to force but to speed $\endgroup$
    – mart
    Sep 3 '20 at 9:25

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