In a message dated 16/01/04 12:23:58 PM, 741662027@charter.net writes: << Notre Dame still stands with the flying buttresses, eh? Time to check assumptions:>> Cy.......well if the legs have "buttresses" they are the flared portion of the leg top which run fore and aft of the leg and not sideways. <<2. The caster pivots around a vertical axis that is coaligned with the center of the leg.>> And, in my opinion herin lies the problem. The typical S&S caster is offset from the center line by aprox 5/8 inches...or a total offset for both casters of aprox 1-1/4 inches. Considering that the key bed will sag of its own accord, if laid across supports at the ends, doesn't it follow that two moments of movement aprox 1-1/4 off center line at the end of 23 inch (aprox) 'unbuteressed' levers might be capable of causing some keybed movement? <<As long as this is true, isn't what happens below irrelevant, as long as its distance to the floor doesn't change?>> No, not in my opinion...besides the distance to the floor of the keybed will change depending on caster orientation......... <<Sure, there are two arms angling downward that support the axle. Are you saying that those arms sag under the weight,>> Absolutely, I have seen enough deformed S&S casters, as well as other makes, to support this in my mind. <<so that if the casters are turned to face each other (caster axles aligned fore and aft with the keys), then the ends of the legs splay out away from each other? >> Yep...see Conrads drawing. :-) Of course perhaps this thread has perhaps just a tinge of anal retentiveness embedded. ;-)
This PTG archive page provided courtesy of Moy Piano Service, LLC