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  • Arduino controlled Rotary Stewart Platform

    Hi, if you burned servo then you probably had severe problem with voltage or maybe put too much stress on the servo. However servos in general are tolerant and can work on various voltages, usually 4.8V-6.0V. Bigger voltage -> faster and more powerful -> in continuous stress bigger voltage will result in shorter lifespan or in extreme cases burn it faster than 5V. Check datasheet of your servos, voltage range is surely there.Current is other question, you have 6 servos which can take a LOT of power. When i tried using servos without enough power (small cheap micro servos) they behaved purely randomly, i had no control of them at all, or with more power (but still not enough) just some of them started behave randomly when they were under load. In the end, i used cheap 3A switching ...see more »Hi, if you burned servo then you probably had severe problem with voltage or maybe put too much stress on the servo. However servos in general are tolerant and can work on various voltages, usually 4.8V-6.0V. Bigger voltage -> faster and more powerful -> in continuous stress bigger voltage will result in shorter lifespan or in extreme cases burn it faster than 5V. Check datasheet of your servos, voltage range is surely there.Current is other question, you have 6 servos which can take a LOT of power. When i tried using servos without enough power (small cheap micro servos) they behaved purely randomly, i had no control of them at all, or with more power (but still not enough) just some of them started behave randomly when they were under load. In the end, i used cheap 3A switching power supply and big reservoir capacitor to improve behavior in current spikes. In power consumption test my servos (standard 75g cheap servos) drew around 1.2A (if i remember correctly) in platform movements, platform had load of around 1Kg.

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  • Arduino controlled Rotary Stewart Platform

    I only had dremel so i used it, press drill would be much better. I think i drilled them to point to the center, although it might not be strictly necessary.

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  • Arduino controlled Rotary Stewart Platform

    Drilling plexi is hard indeed. Be very carefull and drill at very low speeds, it won't melt so much. It is soft so even at low drilling speeds it won't take much time to make needed holes. Often take brakes when drilling a hole if it melts too much, try to avoid any serious melting of the plexi because it can deform hole or even whole part.

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  • Arduino controlled Rotary Stewart Platform

    Hi, ratio between size of base and platform is variable - it will affect range of movements, stability, precision (if platform is significantly smaller than base, range increases, stability and precision is decreases and vice versa), i would say size ratio of platform can be around 50-100% of size of base. Height is also variable, it can be shorter, or higher, depends on needs. If legs are very short, it will be harder to construct and range of movements will be limited by joints. If legs are long the upper platform will not be stable, precision will be bad. I would recommend to choose leg length so that in platform zeroposition their angle from base would be somewhere between 45-60°.

    The security margin should prevent legs going straight up, if they are perpendicular to base, it would be unstable and with poor performance in these extreme positions. therefore platform should always by at least bit smaller and the length of legs chosen so they would not reach these extreme positions.

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