On 01-22-2013 10:36, Jon Danniken wrote:
They're just little sync motors, like you'd find in a clock. To save
money, they don't have any provision to determine which way they spin,
so direction of travel is determined by pole proximity.

That may be true of some, but most I've seen NEVER go in the same
direction twice.

--
Wes Groleau

In any formula, constants (especially those obtained
from handbooks) are to be treated as variables.