Greg et al, My dyslexia got me again. I should have said the treble leg sustains 55% of the 2 front legs. Again, the rear leg on a 9' piano is sustaining a substantially higher percentage of the total mass. To illustrate this, draw a straight line between the treble and bass legs. You will see that the amount of mass occupying the piano on the keyboard side of the bass/treble line is small compared to the mass on the rear side of that line. Conversely a 5' piano's rear leg is sustaining little of the total weight. Try lifting the leg of a 5' piano, it is very easy, but not a 9' grand. Another useless bit of information I discovered while engineering the grand piano tilter is that Yamaha's two front legs are placed further back from the keyslip line than the Steinway, hence you can see that the brand of piano creates variations with the percentage of total load to each leg, Roger ----- Original Message ----- From: "Greg Newell" <gnewell at ameritech.net> To: <pianotech at ptg.org> Sent: Wednesday, September 08, 2010 12:39 PM Subject: Re: [pianotech] Weight question Roger, I don't know why this is but if you dead lift each leg one at a time you will find that the treble is the heaviest. Greg Newell Greg's Piano Forté www.gregspianoforte.com 216-226-3791 (office) 216-470-8634 (mobile) -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Roger Gable Sent: Wednesday, September 08, 2010 11:38 AM To: pianotech at ptg.org Subject: Re: [pianotech] Weight question Having designed my grand piano tilter for the last year to determine weight distribution of grand pianos, I can tell you that the weight distribution depends on the size of the piano. 9' pianos have slightly more weight distribution on the tail, but smaller pianos (around 6') have about 2/3 distributed on the 2 front legs with the bass leg taking approximately 55% of the 2 front legs. A 750lb. piano is commensurate to a 7' piano which would have approximately equal weight distribution on all 3 legs. Of course this varies with the manufacturer. Roger Gable P.S. Why did you need to know this? ----- Original Message ----- From: "Greg Newell" <gnewell at ameritech.net> To: <pianotech at ptg.org> Sent: Wednesday, September 08, 2010 7:39 AM Subject: Re: [pianotech] Weight question No! Lift each one, one at a time, and you'll understand. Greg Newell Greg's Piano Forté www.gregspianoforte.com 216-226-3791 (office) 216-470-8634 (mobile) -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Richard Ucci Sent: Wednesday, September 08, 2010 8:34 AM To: pianotech at ptg.org Subject: [pianotech] Weight question List, If a piano weighs 750 lbs. , should one assume that each leg supports one third of weight? Rick Ucci/ Ucci Piano www.uccipiano.com
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