Thank you so much David and David!! and others as well! This gives me a lot to work with. Thank you both for taking so much time on this. I'm sure you have your own piano problems to deal with. I'll be here all week to finish this up. Friday is my goal. Best, Paul From: David Stanwood <stanwood at tiac.net> To: caut at ptg.org Date: 05/11/2010 11:50 AM Subject: Re: [CAUT] Turbo wips/new info! Hi Paul, I took you data and did and analysis of Balance Weight BW and Friction Weight F Then I took a Balance Weight Specification BWspec and calculated how much to change the Front Weights FWdev to get and even balance. This can be done with most spreadsheet programs. With your touch designers tool kit you could put each key on the scale for Front Weight, tare the scale to zero and add or subtract key leads to make the Front Weight Deviations. Here are the calculations: BW = (D+U)/2 F = (D-U)/2 FWdev = BW - BWspec D2 = BWspec + F BW2 = BWspec U2 = BW2 - F There are other ways to skin this cat but I think this approach is the most expedient because it saves a lot of time with tuning the spring tension. If it were me I would do a double balancing as David Love mentioned. It takes more time. All that's left is to work on smoothing friction. Good Luck, David Stanwood Note BWspec FWdev D BW U F D2 BW2 U2 1 38 M M M M M M M M 2 38 6.0 58 44.0 30 14.0 52 38 24 3 38 4.5 54 42.5 31 11.5 50 38 27 4 38 4.0 54 42.0 30 12.0 50 38 26 5 38 2.5 51 40.5 30 10.5 49 38 28 6 38 4.0 54 42.0 30 12.0 50 38 26 7 38 3.0 60 41.0 22 19.0 57 38 19 8 38 6.0 58 44.0 30 14.0 52 38 24 9 38 5.0 57 43.0 29 14.0 52 38 24 10 38 2.5 54 40.5 27 13.5 52 38 25 11 38 0.5 50 38.5 27 11.5 50 38 27 12 38 3.5 54 41.5 29 12.5 51 38 26 13 38 3.5 54 41.5 29 12.5 51 38 26 14 38 1.5 50 39.5 29 10.5 49 38 28 15 38 2.5 54 40.5 27 13.5 52 38 25 16 38 3.0 54 41.0 28 13.0 51 38 25 17 38 -1.0 48 37.0 26 11.0 49 38 27 18 38 0.0 49 38.0 27 11.0 49 38 27 19 38 0.0 51 38.0 25 13.0 51 38 25 20 38 3.0 54 41.0 28 13.0 51 38 25 21 38 5.0 55 43.0 31 12.0 50 38 26 22 38 3.5 54 41.5 29 12.5 51 38 26 23 38 2.0 52 40.0 28 12.0 50 38 26 24 38 -1.5 46 36.5 27 9.5 48 38 29 25 38 0.0 50 38.0 26 12.0 50 38 26 26 38 -1.5 48 36.5 25 11.5 50 38 27 27 38 M M M M M M M M 28 38 M M M M M M M M 29 38 -1.0 49 37.0 25 12.0 50 38 26 30 38 -1.0 49 37.0 25 12.0 50 38 26 31 38 -2.5 45 35.5 26 9.5 48 38 29 32 38 -1.0 47 37.0 27 10.0 48 38 28 33 38 -0.5 47 37.5 28 9.5 48 38 29 34 38 1.5 51 39.5 28 11.5 50 38 27 35 38 0.0 50 38.0 26 12.0 50 38 26 36 38 0.5 51 38.5 26 12.5 51 38 26 37 38 0.5 51 38.5 26 12.5 51 38 26 38 38 0.0 51 38.0 25 13.0 51 38 25 39 38 -0.5 51 37.5 24 13.5 52 38 25 40 38 1.0 47 39.0 31 8.0 46 38 30 41 38 -1.5 47 36.5 26 10.5 49 38 28 42 38 -0.5 49 37.5 26 11.5 50 38 27 43 38 2.0 50 40.0 30 10.0 48 38 28 44 38 0.0 49 38.0 27 11.0 49 38 27 45 38 -0.5 48 37.5 27 10.5 49 38 28 46 38 -0.5 49 37.5 26 11.5 50 38 27 47 38 0.0 50 38.0 26 12.0 50 38 26 48 38 -0.5 50 37.5 25 12.5 51 38 26 49 38 0.5 50 38.5 27 11.5 50 38 27 50 38 -1.0 48 37.0 26 11.0 49 38 27 51 38 -1.5 48 36.5 25 11.5 50 38 27 52 38 -2.0 48 36.0 24 12.0 50 38 26 53 38 -1.5 48 36.5 25 11.5 50 38 27 54 38 -1.0 49 37.0 25 12.0 50 38 26 55 38 M M M M M M M M 56 38 M M M M M M M M 57 38 -1.5 48 36.5 25 11.5 50 38 27 58 38 -1.0 49 37.0 25 12.0 50 38 26 59 38 -1.5 49 36.5 24 12.5 51 38 26 60 38 -3.0 47 35.0 23 12.0 50 38 26 61 38 -2.5 48 35.5 23 12.5 51 38 26 62 38 -4.5 44 33.5 23 10.5 49 38 28 63 38 -3.0 47 35.0 23 12.0 50 38 26 64 38 -4.0 48 34.0 20 14.0 52 38 24 65 38 -1.0 48 37.0 26 11.0 49 38 27 66 38 -1.0 50 37.0 24 13.0 51 38 25 67 38 -4.0 44 34.0 24 10.0 48 38 28 68 38 -1.0 46 37.0 28 9.0 47 38 29 69 38 -0.5 47 37.5 28 9.5 48 38 29 70 38 -3.5 44 34.5 25 9.5 48 38 29 71 38 -5.5 40 32.5 25 7.5 46 38 31 72 38 -9.5 37 28.5 20 8.5 47 38 30 73 38 -9.5 37 28.5 20 8.5 47 38 30 74 38 -9.5 37 28.5 20 8.5 47 38 30 75 38 -11.0 35 27.0 19 8.0 46 38 30 76 38 -6.5 40 31.5 23 8.5 47 38 30 77 38 -7.0 42 31.0 20 11.0 49 38 27 78 38 -9.5 39 28.5 18 10.5 49 38 28 79 38 -9.0 38 29.0 20 9.0 47 38 29 80 38 -6.0 41 32.0 23 9.0 47 38 29 81 38 -7.0 43 31.0 19 12.0 50 38 26 82 38 -5.0 43 33.0 23 10.0 48 38 28 83 38 M M M M M M M M 84 38 M M M M M M M M 85 38 M M M M M M M M 86 38 M M M M M M M M 87 38 M M M M M M M M 88 38 M M M M M M M M -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100511/32fa644e/attachment-0001.htm>
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