The Ford Barn

Bob Bidonde · 12-13-2015, 01:24 PM

Static Balance occurs when the center of gravity of an object is on its axis of rotation, so gravity has no tendency to cause the object to rotate. For example, when balancing a wheel on a front spindle, mass is added move the center of gravity of the wheel to coincide with wheels axis of rotation, which is the center-line of spindle.

Dynamic Balance occurs when a rotating object supported by bearings has no centrifugal forces or couples acting on it. For example, a crankshaft that is out-of-balance will bend (AKA whip) between its supports as is the case with the center main bearing of Model A's engine. The centrifugal forces that unbalance the crankshaft require equal and opposite centrifugal forces by the addition of weights.

12-13-2015, 01:24 PM	#1
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 4,114	Engineering Trivia - Static & Dynamic Balance Static Balance occurs when the center of gravity of an object is on its axis of rotation, so gravity has no tendency to cause the object to rotate. For example, when balancing a wheel on a front spindle, mass is added move the center of gravity of the wheel to coincide with wheels axis of rotation, which is the center-line of spindle. Dynamic Balance occurs when a rotating object supported by bearings has no centrifugal forces or couples acting on it. For example, a crankshaft that is out-of-balance will bend (AKA whip) between its supports as is the case with the center main bearing of Model A's engine. The centrifugal forces that unbalance the crankshaft require equal and opposite centrifugal forces by the addition of weights. __________________ Bob Bidonde