Richard and list, > > How much energy loss--hence, how much >> of a loss of sustain time--there is in the plate at this point depends >> apparently on the precise characteristics of the individual plate--it's >> thickness, and certain mechanical characteristics dependent on the pouring >> and cooling rate of the casting, etc.--but there is a measurable amount of >> vibration in that area that is damped by the bell and coupling bolt. >> >> Del > >Any comment on whether traditional sand cast or the vacuum process makes any >difference in this regard ? >-- >Richard Brekne The freeze time is longer and distortion is less with vacuum plates. When speaking with foundry folk, I've heard that they are softer and weaker per equivalent sectional size, with higher hysteresis loss. Ron O -- ______________________________ Website: http://www.overspianos.com.au Email: mailto:ron@overspianos.com.au ______________________________
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