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Rattling head Mars Rover PiCar-B

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Post time 2020-12-16 06:18:28 | Show all posts |Read mode
I built the Mars Rover PiCar-B and the problem is that the sensor head (the big head with the Ultrasound and camera) starts to rattle around as soon as it moves, only holding it or moving to the end of the servo movement stops it. It's like the servos can't hold it in position, it also makes the impression it is not very stable on top on that one tiny servo, which seems to be overwhelmed with it.
Has anybody the same experience or found a solution?
I will try with stronger digital servos with a metal gear, but don't know if this will be successful.



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 Author| Post time 2020-12-17 04:47:44 | Show all posts
I've now bought myself upgraded servos, or better said "suitable servos". The servos in the box seem to be either fake Tower Pro, or absolutely overwhelmed with this robot car.
I've tested the servos with a servo tester, one was already broken and probably caused more pain for the other one in the head. If I wouldn't love to build those things, I would be super angry about such a low quality, or let's say unfit for purpose part in this kit, because I had a lot more hours to make it work! The new servos are from the same manufacturer "Tower Pro" but the model is the MG90D, with a lot more power and digital, so very precise: https://www.towerpro.com.tw/product/mg90d-robot-servo/
I paid £7 per servo, so that was an extra £21, but now I can have a calm mind and work properly with this robot car. If other models are equipped with the same low quality, I would think twice before I buy, and if only with a discount so I can pay for the other servos.
Hope this helps others!
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Post time 2021-1-4 17:50:29 | Show all posts
just to be sure: upgrading servos to mg90d fixed rattling head issue ?
no problems with physical fitting of new servo ?

thanks
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