I sent this yesterday, but it is not showing up. I will re-send at the risk of having both posts appear... I apologize if they do. On any upright, the bore is never calculated as below. Otherwise, as has been alluded, the hammer shank would be vertical when the hammer meets the string. A ballpark hammer bore determination for an upright would be: String to center pin distance less blow distance plus 5.5 mm (7/32"). Jurgen Goering Piano Forte Supply www.pianofortesupply.com On 2013-02-14,pianotech wrote: > > Measuring the string to center pin distance and subtracting the blow distance is not always the correct method to determine bore distance. and > Don't you measure from the string to center pin and subtract the blow distance? I thought that was it. Please correct me if I'm wrong. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130215/be8df686/attachment.htm>
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