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Originally posted by Neal Probert
If you have to stop to shift gears, it's not worth it. You only have a couple minutes in the contest and wasting time just shifting gears is not a good idea.
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It depends on your mission whether or not taking time to shift is a waste of time. It also depends on the length of time it takes to make the shift and how reliable your system is.
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We tried it, with the shifter on the drill motors, last year on #830. With the servos linked to the clutch on the drill motors, it never really worked right.
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There's your problem right there, servos. A small pnuematic cylinder works much better for shifting if it is properly linked to the tranny. The pnuematics are also much faster and if all you are doing is shifting, you probably don't need the compressor either.
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We had to lock the clutch to prevent slipping and we eventually locked the drill into low speed. We could push around a bit and still get across the field reasonably fast.
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Locking the drill motor clutch should be standard procedure. If your low speed was still reasonably fast it was geared too high to start with.
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This year, on #1015, we have tentative plans to go with a dual motor gearbox.
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Hope you're working on it already, not the real one, a prototype of course!