Re: [OT] Pulling/pushing a cord with a motor?
From: Terry Pinnell (terrypinDELETE_at_THESEdial.pipex.com)
Date: 07/08/04
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Date: Thu, 08 Jul 2004 04:28:02 +0100
Activ8 <reply2group@ndbbm.net> wrote:
>On Wed, 07 Jul 2004 21:21:13 +0100, Terry Pinnell wrote:
>
>> Jim Thompson <thegreatone@example.com> wrote:
>>
>>>Remember the stringing method of old-style radio dial cord?
>>>
>>>Take *multiple* turns around a wide pulley. In the middle of the
>>>*multiple* turns tie the cord down thru a hole in the pulley.
>>>
>>>Voila! No slip.
>>
>> Thanks, I'd forgotten about the 'tie-in-middle' trick.
>
>I like the old radio rigging, too, but that isn't the best solution
>except that now you almost have to incorporate a safety measure to
>keep fingers out.
>
>See, now the cord isn't continuous but runs out at the knot. You
>either need enough pulley to store the whole length of cord to be
>moved or multiple turns.
No. As mentioned earlier "I measured the movement necessary to open
and close at about 51 cm". So a 5cm (2") diameter pulley would require
less than 4 turns. This is a small bedroom curtain, not a frigate's
mainsail <g>.
-- Terry Pinnell Hobbyist, West Sussex, UK
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