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08-30-2009, 08:11 PM
| #1 |
| On the lookout for Rocks   Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
|  Airtronic 94780 Servo Users
I have just noticed on my Airtronics 94780 servo that I have slack in the output shaft. Here is a pic. I was running a Robotronics servo arm and you can see where it was contacting the case.  Here is a video of it. http://www.youtube.com/watch?v=JCVEob7Zs9w Has anyone had this issue? I have pulled it apart and there is no signs of wear on the inside of the case where the bearing for the output shaft rides. Everything looks to be in order. Last edited by constantmotion; 08-30-2009 at 09:06 PM. |
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08-30-2009, 08:33 PM
| #2 |
| Quarry Creeper Join Date: Aug 2009 Location: Palo Alto, Bay Area
Posts: 218
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Mine works perfectly. From your vid, it sorta looks like the servo horn is wobbling on the output, but the output may not neccesarely be woblbing. Maybe the servo horn as started to widen over time. Try using another horn, and see if you sitl lhave the porblem.
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08-30-2009, 09:03 PM
| #3 |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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The servo horn on the it in the video is brand new, never used...just installed it. The shaft is clearly moving. I have pulled the servo horn off and I can wiggle it a little bit. This would explain why the servo is getting a little hotter than normal here lately....gears are binding up. **EDIT** Broke out the video camera. Video now is a better shot. Last edited by constantmotion; 08-30-2009 at 09:08 PM. |
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08-31-2009, 12:22 AM
| #4 | |
| RCC Addict Join Date: Jan 2005 Location: Germany north
Posts: 1,669
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08-31-2009, 10:36 AM
| #5 | |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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08-31-2009, 01:13 PM
| #6 | |
| RCC Addict Join Date: Jan 2005 Location: Germany north
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08-31-2009, 02:11 PM
| #7 |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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Here are some pics of mine....no visible signs of wear.    Last edited by constantmotion; 08-31-2009 at 02:13 PM. |
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08-31-2009, 02:32 PM
| #8 | |
| RCC Addict Join Date: Jan 2005 Location: Germany north
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08-31-2009, 02:33 PM
| #9 |
| MODERATOR™   Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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Pretty sure it's the center case needs to be replaced. Mine should be here in a few days and I'll find out for sure. With my servo I replaced the top case and it didn't really help, so I believe the center case hole has gotten beat up a bit. I'll find out soon and report back when I get the part. It cost one dollar at Globalservices.com |
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08-31-2009, 02:48 PM
| #10 |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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Good catch......the piece around the POT was broke. I guess that would be considered the middle case.   |
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08-31-2009, 02:49 PM
| #11 |
| I wanna be Dave Join Date: Feb 2004 Location: Columbia Gorge
Posts: 5,512
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How's the bearing right there at the end of the output shaft? Does it have excessive play?
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08-31-2009, 02:51 PM
| #12 | |
| RCC Addict Join Date: Jan 2005 Location: Germany north
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08-31-2009, 02:54 PM
| #13 | |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
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08-31-2009, 03:00 PM
| #14 |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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Is the motor glued in? This damn glue/silicon that they used to cover all the connections are a PITA Last edited by constantmotion; 08-31-2009 at 03:05 PM. |
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08-31-2009, 03:07 PM
| #15 | |
| RCC Addict Join Date: Jan 2005 Location: Germany north
Posts: 1,669
| Quote:
 some pics please  | |
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08-31-2009, 05:05 PM
| #16 |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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The "middle case" is extremely brittle. I got the board and POT out. I hope the pats that I ordered were correct. :? Hope that I haven't trash a $120 servo.  Last edited by constantmotion; 08-31-2009 at 05:10 PM. |
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08-31-2009, 05:27 PM
| #17 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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Lotsa broken pieces. Hmmm. By brittle you mean look at it the wrong way and it'll break? I'll get a picture up when I get mine. Got an email it shipped. |
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08-31-2009, 05:44 PM
| #18 | |
| Quarry Creeper Join Date: Aug 2009 Location: Palo Alto, Bay Area
Posts: 218
| Quote:
   :-( Anyone wanna buy my servo used? It only has 2 runs on it, that too on a savage with a loose servo saver.
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08-31-2009, 07:24 PM
| #19 | |
| On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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There is a screw that looks to be holding the POT down under the board, but it's not. I am still not sure what the purpose of it is. Last edited by constantmotion; 08-31-2009 at 07:36 PM. | |
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09-02-2009, 02:27 PM
| #20 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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Here it is! Guess I'll dig into mine today. |
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Linear Mode
