David - There is a German term (of course!) for this: "Stielsschräge", which translates into "(hammer) shank obliqueness". This is what I was posting about a few days ago at the start of the "overstriking" thread. I have never heard of a corresponding term in English, perhaps there is one in Britain? Jurgen Goering Piano Forte Supply (250) 754-2440 info at pianofortesupply.com http://www.pianofortesupply.com On Nov 29, 2006, at 8:35, David S. wrote: > Andreas - > > My first thought was to suggest that you try impersonating a German > engineer, and come up with a lengthy, un-hyphenated word that > describes exactly what it is and what it does. Something like: > uprighthammershankstrikedistancedifferentialanglunginn. I thought a > bit more about it and concluded that, it is a spec that would probably > be infrequently applied by either general technician (unless one was > redesigning an action), but, even if I'm wrong about that, its > applicability to action response presupposes that the string plane > itself is perpendicular, both by design and in situ (ie. is the floor > level?). In theory, that angle, or those distances could be altered > to have no effect on repetition and touch or significant effect. In > fact, it seems as though it might be possible to achieve a range of > touch regulation by altering the caster heights, front to back. The > angle, in relation to true perpendicular would be relevant, and worthy > of a name, like upright hammershank offset angle, or something. I can > also envision a relatively simple tool that could provide a direct > angle reading. > Good thing we have springs! > > Looking forward to the book. > > David Skolnik > > At 11:29 PM 11/28/2006, Andrea Reisberg wrote: >> Fellow colleagues, >> >> The second term is only applicable in uprights. When the hammer >> touches the strings, there’s a small difference between the distance >> from the strings to the shank, just beneath the hammerhead, and the >> distance from the strings to the shank down at the butt. Directly >> translated from Norwegian to English it would be called Hammer Fall >> Angle. Ironically, although it’s called an angle it’s expressed in mm >> instead of degrees since it’s the difference between two distances. >> What is the English name?and: >> It is rather the angle between the shaft and the strings at impact. >> This has to do with balance; if only gravity were the acting force, a >> relatively heavy bass hammer balancing against a light butt and back >> stop wouldn’t be as inclined to returning to its starting position as >> a light treble hammer balancing against the butt and back stop. This >> measurement is something you would check when reinstalling the action >> if you have removed the keybed and the action bracket bolts during a >> rebuild. If this angle or measurement is too small, repetition will >> be slow or lost, and if it is too big the touch will be very heavy. > > -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 2942 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20061129/988872e8/attachment.bin
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