> > Another is to build a direct reading MC gage with a strip of > spruce and a cheap dial indicator. Even if you don't bother to > try to calibrate it to any specific MC, it can still be used > as an indicator of dimensional change with Terry's approach > without having to haul the panel out to measure it. Nice gauge - thanks for the pic. >> < Do you have the sling hygrometer? What brand and where did you get >> ? > > Got one, but it's hard to swing in a 6" wide box. <G> Maybe this is why it is sometimes called a psychrometer? >> I suppose that after the board is ribbed, this same movement can be >> measured as available crown with similar associations with changing >> environment? > > MC changes can be observed this way, but not measured, and not > after the piano is strung. Crown in a strung piano doesn't > usually vary much at all with MC changes. On a rib crowned board in a shop that the environment is difficult to control, changing available crown (prior to stringing) has brought me to this. Adjustable plate bolts and vertical hitches are a must. Thanks Ron. Gene
This PTG archive page provided courtesy of Moy Piano Service, LLC