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Transmission help
Me and a bunch of other members of team 1073 are going to be designing and building a new shiftable transmission with the help of our mentors. I'm just curious what other teams who had them think about them. Are they worth it, are they helpful for only certain times or helpful in every match. I don't need blue prints, (if you want to you can post them though :o ). I just want to know if this is going to be worth the trouble, thanks to all those who post, and see you all come next season.
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Re: Transmission help
I find it to be very useful. The reason why I like it is because, sometimes you want the extra speed and sometimes you want nimble maneuverability, this gives you both. Also, you can help keep your battery up longer for the match, instead of running high RPM's the whole match, you can save some for the end of the match. If you need help with the design, some good people to talk to would be, Andy Baker, Paul Copioli, JVN and Andy Brockaway.
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Re: Transmission help
We have never built our own shifting transmission, but this year we took the plunge and bought the Andy Mark 2-speed shifting gearbox's. They were great gave us good speed and power. Easy to mount, very little to worry about as long as you install them properly (lets just say that we killed one :yikes: ). They are defiantly a lot easier than making your own, but they do come at a price :o. Take a look at them: http://www.andymark.biz/am-shifter2speed-gen2.htm
But making your own is always more fun :D. |
Re: Transmission help
The head programmer of 1155 and i have been looking into designing our own type of gearbox for the 07 season that we hope to prototype in the preseason in order to educate the new members and get warmed up on building. one thing that we have found very helpful is to look at all the plans and pictures of other two speed transmissions that have been used in FIRST and borrow ideas from them(for example the usage of dog gears in the AndyMark gearboxes).
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Re: Transmission help
We did a 2 speed dog shifting transmission both this year and last. While I think it is useful, you need a driver who can use it. There's no point in building it if your driver won't shift.
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Re: Transmission help
for the past two year's 340 has had a multiple speed transmission. last year we worked on the Dr. Joe DeWalt XRP transmission (read this for suggestions on how we suggest how do it) while this year we went with the Andy Mark two speed. we find them very useful to the games an love having them. if you need help with the design or anything like that let me know. i have helped out the students with the designs for mounting, custom plates, and other components during both of the years.
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Re: Transmission help
My team used a pair of AndyMark two-speeders. We had a pneumatic shifter, but had to take it off to make weight, so we just jammed the shifter into low gear. However, about halfway through our second regional, we added a shifter using servos, which worked ok.
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Re: Transmission help
Shifting is very useful. It allows you to quickly traverse the field and still push, pull or climb. I think the design of the game dictates how much you use it though.
I think teaching the students by designing and building the transmissions is a great idea. I think the knowledge gained is invaluble. However just to be that guy and make sure you know what your getting into I want to let you know some of my experience. You will spend more money to make them than AndyMark's costs. Just know that right off the bat it has been discussed in many threads here at CD. Plan out your gear meshing carefully. There are a lot of good white papers and threads to search here about suggest DPs for dog shift vs direct meshing transmissions. If you use dogs to shift, unless you have REALLY good CNC programers and machines, just buy them from AndyMark. Trust me on this, it took two years of trying before we made the switch. I suggest trying to work out a servo shifting mechanism as part of the project. The weight payoff should be worth it. Pete |
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Re: Transmission help
We have a 2-speed dog-shifting transmission that we've used in 2003. Back then, our robot was a beast and people often commented on the power of our tiny 14 inch high robot.
It's got nice power in low-gear and nice speed in high-gear in at 15 lb (for both) package |
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EDIT: I had a total brain fart on this. We couldn't make a dog it because we couldn't broach the hex slot. |
Re: Transmission help
We made our own 2-speed dog shift transmission this year. It worked great. No break downs. We made all our parts at our school machine shop, no CNC. I'll post some pictures in the future. One advise, just watch for the weight when designing a transmission.
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1. Buy your own (AndyMark) -Yes: No effort needed -No: Expensive 2. Make your own using another team's design -Yes: Many different designs to choose from -No: Access to a machine shop and material 3. Design from scratch, figuring gear ratios and sizing -Yes: Build the perfect transmission - No: Requires a machine shop, material, complex project needig time I should mention that in the last two years teams have been using modified DeWalt XRP cordless drill transmissions on their robots. These are 3-speed shifters are worth researching. Search the white papers for Nothing But Dewalts (.pdf) ;) |
Re: Transmission help
Everything I was going to say has been said. except:
If you build a transmission that uses a dog mechanism to switch gears, I would suggest purchasing a couple extras (or making them as the case may be) so that if you are at a competition and one breaks, you will have a spare handy. Just a thought. |
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