[chbot] Discrete servos

[Andrew Errington]

Some metal-geared RC servos have a /lot/ of torque.  Are you sure an RC
servo won't work?

Andrew

On 1 December 2016 at 09:50, Charles Manning <cdhmanning at gmail.com> wrote:

> A couple of stepper motors out of old printers or something like that
> would do it.
>
>
> On Thu, Dec 1, 2016 at 1:29 PM, Mark Atherton <markaren1 at xtra.co.nz>
> wrote:
>
>> More info about the load please.
>>
>> Size, weight, expected rotational velocity, supply voltage, acceptable
>> control interfaces...
>>
>> -Mark
>>
>> On 1/12/2016 12:52 PM, Robin Gilks wrote:
>>
>>> Greetings all
>>>
>>> As usual, I'm building something and I can't seem to find what I want off
>>> the shelf. Think pan head for CCTV system.
>>>
>>> I can get really cheap ones from AliExpress but they are just about all
>>> Pelco-D controlled which allows pan direction and speed and not actual
>>> proportional control. They are also very slow, taking some 20-30 seconds
>>> for their full range of movement.
>>>
>>> A standard rc servo isn't going to be up to the job although the API
>>> (pulse position) would suit, I'm thinking 12v or 24v DC motor, H-bridge,
>>> gearing, feedback pot and control circuitry. Its the last where I can't
>>> get it off the shelf as the industry standard M51660L is 5v only.
>>>
>>> Any ideas what would be best to start from such that the mechanics can be
>>> easily adapted with some sort of discrete controller for the proportional
>>> bit?
>>>
>>> Thanks
>>>
>>>
>>
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>
>
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