[chbot] Discrete servos

[Charles Manning]

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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