The ordinary joint controller is build with a usual electric coil and a permanent magnet, that is turing the rails. It really fast, but not really powerful. Just a little piece of gravel is prohibiting its functionality. The resultis really frustrating. So I decided to change this behaviour.

First idea was to use a servo, but the creation of a PWM signal for its control is simply too complicated. So why not usinga simple electric motor with a micro gearbox? Well – that sounds perfect. DC motors are able to spin in both directions. I found a DC motor in an electronic online shop with an integrated 1:1000 gearbox. Next step is to establish an automatic end switch for both directions. I found a great circuit digram in the net. So with some patience I used to original case and replaced to content.

It is working in perfecting. It is moving very smooth, but also very powerful. It is that strong, that it my push 12 kg (24pds)!!! So there shouldn’t be any issue anymore! Let’s turn joints!

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