On 6/25/2011 03:09, azotic wrote:
(AP) WASHINGTON (AP) - A yearlong experiment with the nation's electric
grid could mess up traffic lights, security systems and some computers -
and make plug-in clocks and appliances like programmable coffeemakers
run up to 20 minutes fast.

"A lot of people are going to have things break and they're not going to
know why," said Demetrios Matsakis, head of the time service department
at the U.S. Naval Observatory, one of two official timekeeping agencies
in the federal government.


Read mo
http://www.cbsnews.com/stories/2011/...#ixzz1QGjmtbRD


So will shop motors run slower or faster ?

Best Regards
Tom.

Worst case scenario: East coast clocks at 20 minutes/year.

60 Hz *60 sec. *60 min. *24 hr. *365 day = 1892160000 cycles in a year

20 minutes of extra cycles:

60 Hz * 60 sec. * 20 min. = 72000 cycles


72000 divided by 1892160000 = 3.805175038051750380517503805175e-5

or in non exponential terms: .00003805 which is .003805 percent
frequency change. I doubt if any machine motors will notice the
difference. The same with almost all digital clocks, which use a crystal
to set the frequency, not the grid. Maybe your grandfather's Westclox
electric alarm, with the motor, but even most of them were/are self
correcting, each time you adjust the time, they get a little bit more
accurate.


--
Steve Walker
(remove brain when replying)