RoboStar Servo Modified Bottom Panel

by carbonbased, published

RoboStar Servo Modified Bottom Panel by carbonbased Dec 10, 2015
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991Views 110Downloads Found in Robotics


I found these very nice super high power, all metal drive train servos at Hobby King (RoboStar SBRS-5314HTG) for use in a robotics project. I intend to mount them inside Actobotics channel, and they fit perfectly EXCEPT the wire exit is blocked by the channel.

My solution was to move the wire exit to the front of the servo. This is a very simple and quick retrofit.

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Make this pretty much solid and use a small layer height to capture all the detail.



(1) Remove the four bottom screws and bottom plate. (Requires 1.5mm hex driver)
(2) Use cutters to free the hot-glued header from the bottom plate.
(3) Plug the provided cable into the header (or one of your choosing).
(4) Align the cable with the front, making sure the header and connector are clear of components. (If hot glue is no longer insulating the header, insulate with tape so it does not accidentally short out against the motor.)
(5) Screw in newly printed bottom panel.
(6) Profit!

How I Designed This

This was whipped up in Sketchup 2015. Source file included.

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Hi, I don't have any of these servos yet, but was thinking of getting some. (otherwise i would just check myself)
The original backing plate has that cylinder stub on it. One of the reviews on HobbyKing make me think that this holds the back of one of the shafts or shaft bearings? if so, doesn't this new design allow movement under high torque?
Just wondering.
Nice job BTW.

Hey there - sorry for the delay in getting back to you. I'm probably the one who put the review up on Hobbyking. That stub is really a hole (as seen from the outside) that acts as a hinge point opposite the drive shaft. Some robotics applications use this mounting method. It does not affect the "sturdiness" of the servo. They are good, strong servos but the problem I was having with them was that the shafts that hold the metal gears are held in place with plastic, so ultimately the plastic breaks and the gears separate. However, I was pushing the limits of the servos and also exposing them to some "shock" on the output shaft, so they might work out fine for your application. Cheers!

You are quite welcome. I'm always surprised when I upload something obscure like this and it still gets downloads. Good luck with your project :)