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gear shifting
On our bot we use the drills as our primary motors. Unfortunately we have had problems shifting them with servos because they don't go all the way into one position or another consistently. Has anyone run into this? Does anyone know a better way besides using pnuematics? Any ideas are appreciated!
Thanks JSK |
I think pneumatics would be awfully hard to use and not break the collar on the motor. When you shift them and they dont go all the way, as soon as you drive a bit, the gears should mesh and the collar should fully move into either the hi or low gear position, at least they do in our design.
Cory |
no no no....we use the servo motors to switch as of right now....we have determined that we won't use pnuematics that is why I said other than pnuematics.
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how are your servos connected to the transmissions.....one fix that I have encountered is that the servos arn't powerful enough to shift so the fix is to extend the arm and use leverage to help...... also with servos you have to come to a complete stop before shifting.....if you want me to get more specific in how to use leverage please e-mail me tarbell@comcast.net
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We've used pneumatics to shift for the last 3 years without breaking a single collar.....ever.
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we have the drills mounted in the plastic mounts then over top of them upside down we have the servos mounted on aluminum brackets. The servos then push the collars back and forth as needed....hopefully that clears it up a little bit. Any ideas
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Try some of these. They will all fit right on the output of the servo and have multiple mounting locations for linkage. You should be able to get most of them at any quality hobby store.
http://www2.towerhobbies.com/cgi-bin...rn&FVPROFIL=++ |
We use servos to switch gears too... and it was working very nicely, until our servos burninated, and we were stuck in low gear during competition. That hurt us a lot. :(
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hey jon did Trogdor happen to in the near vicinity to do the burninating :p
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oops I forgot to mention that we have a tiny linkage in between the servo and the collar....sry. We have a servo wheel horn with a metal linkage from that to the collar to be exact as possible.
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We had a horrible time shifting with servos last year. One of the problems is that the "slider" in the trans that moves between the planetary sections pivots on 2 horizontal pins. There is quite a bit of clearance between the housing and the slider, which allows the slider to rock on the shifter pins and not mesh into high or lows squarely. You would be better off to build a custum housing and shift fork that you can space the pins 120 degrees apart. That's what we did this year. I have a few photos posted in the Gallery. This has been a very reliable system. As far as shifting method, pneumatic or a servo would work consistantly. If you are familiar with R/C car suspensions, you can use the little ball joints and Tie-rod screws to build a sweet linkage for the servo method. :cool:
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Quite frankly, I haven't been to impressed with the servos. They have a mechanical freedom of almost 360 degrees, but our programer said he could only get 180 degrees of movement. That was a bit of a bummer, however, if anybody's got any information to the contrary, it would be much apreciated.
S cubed |
hmmm ive played with the servos before, and they looked like they had a rotation of around 270*ish.
Cory |
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