SCX24 servo

[vinceherman]

I am running upgrades for 3 trucks. I have a bunch of brass andI have servos on order. 2 Emax. 1 Reefs 99.
I do not want to start the disassembly until I have all of the pieces ready to go. The emax servos have been sitting in the post office distribution center one town away for weeks. :-/


While I wait, I wanted to record how the stock servo behaved to be able to compare.


This video shows the failure. I have my C10 on a steep descent on the (very rough) beginnings of my indoor track.


Of note, the servo is traveling full throw each direction. The servo saver is giving way before it applies enough force to lift the truck.


When the servos come in, I think I will put the reefs on one truck, the emax on another and the stock servo with a solid arm on the third.

https://www.youtube.com/embed/9xF7ZYzev9A

 

[air8]

In 10th scale off-road racing, my buddies and I always glued the servo savers with CA glue. Of course we always used over powered servos so the chance of breaking them never happened.

But with tiny electronics on these trucks, there is that chance. Especially since the tires are getting jammed into awkward angles.

 

[vinceherman]

I think I will try that. Especially since I have replacement upgraded servos on the way.

 

[air8]

I feel everything would be fine. Parts break though and that's part of the hobby. Building better toys. LOL. Enough tumbles off of rocks and sticks will eventually break something.

I look forward to your comparisons.

 

[vinceherman]

Well, good news and bad news.
It was super simple to remove the servo arm/servo saver. I cleaned the parts with rubbing alcohol, applied a drop of CA, let it set up and the reinstalled.
This video shows that the servo has plenty enough power to lift the truck.
https://youtu.be/xuhWPWwN3zI

So, good news there. The Bad? I believe that the internal pot has become separated from the output shaft. I did not crank the allan driving in the screw. I held the servo arm while I reinstalled to avoid abusing the internals. But, clearly damage was done.
https://youtu.be/v5ylOwHxrFo

You can see that the servo pick a new 'center' each time it travels fully one direction or the other.

I do have the reefs rc 99 already here and 2 Emax servos should be arriving soon. But I really wonder what damaged the servo.
Oh, running without the servo saver present opportunities to burn out the servo. Without the saver I can bind the servo. If I leave it bound and unable to reach its full throw, it can overheat and burn out. But that is not what happened here. I removed the output arm. I reinstalled the output arm taking care to hold the arm so that I did not crunch the gear train. I have done this a zillion times with very small servos in my micro RC plane hobby.

 

[air8]

Wow. Dang it. I have never seen a servo do that. I have seen some not return to the exact center, but never seen one pick a side like it's throwing a fit. LoL.