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Re: Shifting with servos
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Re: Shifting with servos
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Or because they haven't got anyone with experience using them. 67 has not used pneumatics since 2004 from what my brother was saying. Bear in mind that when you are disengaging the dog gear you are fighting friction. If you don't have something else taking the load from the winch you will be fighting a LOT of friction. You can overcome it but chances are it won't be easy. A simpler solution might be to use a ratchet style system that takes the load. You'd need to figure out the math behind your particular system to tell if a servo or a motor with a cam could achieve the desired results. |
Re: Shifting with servos
I hope you are geared pretty low, considering the tension levels needed to launch the ball well. A ratcheting mechanism of some type will also be needed to avoid stalling the motor. Is using electrical solenoids an option for shifting?
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Re: Shifting with servos
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Re: Shifting with servos
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As to the original question, I have two points to consider: 1. Using a ratchet to take the load off of the gearbox entirely is a good idea. We built a custom dog system for a winch, and once we get it into place the motor drives back a little and the ratchet/pawl takes the entirety of the load, so we can use a tiny little pneumatic cylinder to disengage the winch. (We have a fatter-but-not-insanely-so cylinder then disengaging the pawl, which takes about 12 lbs of force.) Given that you probably need a ratchet of some kind to keep the system from back driving anyway, this is a good idea to consider. 2. If you're not going to have any other pneumatics on your robot and a servo just won't do, consider using a screw drive. They're as strong/fast as you need them to be (based on motor power, of course--in 2010 we lifted our robot using a CIM-driven screw), accurate, easy to control, and for your application perhaps the best thing is that they're motor driven. What they're not is efficient, but you can use this to your advantage to prevent back drive in some applications where that's desired. |
Re: Shifting with servos
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I've also run bots that servo shifted dewalts and when a shift was requested we backed off the power to the drive motors momentarily while the shift happened. Not the best, but it worked. Course, I'm loving the simplicity of a 6CIM single speed right now. |
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