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Unread 23-03-2003, 18:41
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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
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Unread 23-03-2003, 18:45
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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.

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Unread 23-03-2003, 18:48
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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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Unread 23-03-2003, 18:55
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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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Unread 23-03-2003, 20:07
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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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Unread 23-03-2003, 20:14
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Quote:
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!
How are you attaching the servo to the shifter? I would get a better idea if you tell me how.
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Unread 23-03-2003, 21:59
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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

Last edited by Stephen Kowski : 24-03-2003 at 16:15.
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Unread 24-03-2003, 17:10
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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
And you say you are not getting enough throw with the servo's directly mounted on the gear box? Why not try using a mechanical linkage to increase the throw? They are designed to be used with servos and are used to for linear movement. Im sorry if Im not that much help.
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Unread 24-03-2003, 17:20
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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=++
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Unread 24-03-2003, 17:32
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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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Unread 24-03-2003, 18:39
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hey jon did Trogdor happen to in the near vicinity to do the burninating
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Unread 24-03-2003, 19:56
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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.

Last edited by Stephen Kowski : 24-03-2003 at 20:05.
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Unread 26-03-2003, 21:11
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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.
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Unread 26-03-2003, 21:31
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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.

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Unread 26-03-2003, 21:49
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hmmm ive played with the servos before, and they looked like they had a rotation of around 270*ish.

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