9ab9492a

PID: SoupGate-Win32 v1.05
On 22.12.18 01:01, D.M. Procida wrote:
> Folderol  wrote:
>
>> On Fri, 21 Dec 2018 21:17:08 +0000
>> real-not-anti-spam-address@apple-juice.co.uk (D.M. Procida) wrote:
>>
>>> I'm fairly new to servos.
>>>
>>> I see that they come in two basic types: continuous rotation (their
>>> speed of rotation is determined by the pulse width) and fixed travel
>>> (usually 180 degrees, sometimes a bit more).
>>>
>>> They come in various standard (not sure how standard these actually are)
>>> sizes - micro, sub-micro, standard.
>>>
>>> And they can have plastic or metal gears.
>>>
>>> What else should one be aware of? I have an application in which I'd
>>> like reasonable accuracy and precision, and for a 5-degree command (say)
>>> to have a 5-degree output.
>>>
>>> I've been fooling around with a pair of HiTec HS-55s - they're OK, but
>>> they are not what I'd call precise. One of them also takes the slightest
>>> excuse not to respond (possibly my abuse has damaged it).
>>>
>>> If I wanted something stronger and more accurate, and don't need more
>>> speed, what sort of thing should I be looking at?
>>
>> Is there a reason you chose a servo motor?
>>
>> I've always preferred stepper motors. They are far less finicky and very
>> precise. If the step size is too great, you simply gear it down.
>
> Mainly that I happen to have a couple of servo motors already, and
> GpioZero and MicroPython can drive them directly.


It seems that here is a mix-up with the word 'servo'. The OP seems
to use it in the model airplane/ship/car sense, where there is a small
motor with gearbox and actuator.

The industrial idea of 'servo' is a DC motor with position or velocity
feedback. This is the thing used in similar places as stepper motors.

--

-TV

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