> > ....Foundry castings need time to "cure" for strength.... > >Do you have any technical reference for this? I've been trying to track down >solid information on the subject for some time--but to no avail. It's long >been assumed and talked about--at least within the piano industry--but I'm >after specific details. What 'strength' parameters change over time? >Stiffness? Impact strength? Compression strength? What? My understanding is that curing of iron castings is done to allow internal stresses from the casting process to stabilize before putting the object under external stress, to prevent subsequent warping. I'm not aware of any references to strength parameters changing from 'curing' castings. Stephen Stephen Birkett Fortepianos Authentic Reproductions of 18th and 19th Century Pianos 464 Winchester Drive Waterloo, Ontario Canada N2T 1K5 tel: 519-885-2228 mailto: sbirkett@real.uwaterloo.ca http://real.uwaterloo.ca/~sbirkett
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