On Mon, 10 Feb 2020 12:36:42 +0000 (GMT+00:00), "Graham."
wrote:

fred Wrote in message:
For various reasons I wish to run a thinnish pull cord via 4-5 pulley wheels. Does anyone know if smaller pulley wheels offer more resistance than big ones?


Bell-cranks might be more suitable than pulley wheels.

Only if they are only used to change the direction of the 'pull'
rather than to gain mechanical advantage as per a hoist etc?

Wouldn't a bell crank have the same rotational friction as a pulley
(for the same diameter and rotation angle) and may also have the same
additional frictions on the end links as the cord might have flexing
round the pulley?

Interesting thought though. ;-)

Cheers, T i m