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#12
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Re: pic: 6 speed?? Great in theory - lets see how it works!
Quote:
I agree with Mike. This is the best method I can come up with. Get 3 different length pistons. (I recommend as small as you can.) Put them in series. As long as the pistons are all different lengths, you now have a 6 position shifter, with a high repeatability (the important thing.) The only tricky part would be pulsing through the gears without the shifter "back hopping" on it's way forward. (as in, if you have a .5 and 1" cylinder, 2nd gear would be .5 out, 1 in... 3rd gear would be .5 in, 1 out... so to shift from 1-2 you'd need to grind into 4th or into 1st.) With this method, you could shift both gearboxes at once to save on the total # of cylinders on the robot. Mount the cylinder centrally, and run it to both gearboxes, such that it pushes out, or pulls in on both equally. Another option is "pulsing a pneumatic" using 2 solenoids on the same cylinder. I am NOT a pneumatics whiz, but someone else can tell you the pros and cons of this method. Also... what about a servo? How much torque is required to shift? I always think of pneumatics as being better for shifters, but I hear 226 had some luck converting their tranny to servo actuated. Maybe that would be good for your application. Also... Sean... 6 speeds? Is the field a 1/4 mile strip now? Do you know something we don't? ![]() Take Care, JV |
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