VIEWS: 13 PAGES: 4 POSTED ON: 4/23/2010
TouchRail R Touch Weight Measurements BEFORE AFTER 80 80 70 70 60 60 50 rest down weight TR rest down 50 weight 40 40 TR up weight 30 up weight 30 20 10 20 0 10 The left chart shows down weight and up weight measurements for the bass section of a mid 70’s vintage Steinway model M. After traditional regulation and lubrication, this action remained heavy, despite having 5 leads in each key . The right chart shows the same action after installation of a TouchRail with down weight measurements readjusted to 52 grams. The TouchRail produces a lighter, more consistent touch response more data TouchRail versus Supplemental Lead Weights 75 This graph shows how the TouchRail compares with added 10 gram down weight reduction lead weights when reducing down weight by 10 grams. Key 65 resistance has been measured at several points along the keystroke. From left to right, each line includes: 55 1. Rest position down weight original 2. Down weight just before escapement 45 3. Low key return force * TouchRail 4. Up weight 10 gram 35 reduction The dotted line is the original key. The Black line shows the lead weights 25 same key with added lead weights. The green line shows 10 gram reduction the original key with added TouchRail (no added leads). In the two lower lines, initial down weight drops equally by 10 15 grams. But as the key travels downward, (moving from left to right in the graph) the TouchRail preserves 5 important low key measurements. The TouchRail key rest depressed low key upweight down down return feels lighter than the original, and more responsive than weight weight the lead loaded key. *low key return force = maximum weight that a fully depressed key can lift to restore its mechanical repetition more data function. Low key return force differs from conventional “up weight” in that it is measured from the fully depressed key position with the hammer unchecked . New Opportunities for Reduced Inertia, Improved Repetition Photos on the left hand side show a conventional action with down weight of 49 grams. Below is the same key with lead weights progressively removed and a TouchRail added to restore the original 49 gram down weight. Top right photo shows the removed lead weights, totaling 51 grams. In the graph, down weight (blue), remains constant (49 grams) as a result of the TouchRail offsetting the reduced lead weights. The green line shows a dramatic increase in low key return force*. The TouchRail- assisted key retains progressively (up to 20%) more low key return force than the lead weight key. Note: 1. Key lead removal in new pianos can more data alter the warranty. 2. Lead is toxic. Use caution when handling key leads. LONGEVITY TESTING This photo shows a repeated cycle test in progress. The sprung oscillating paddle, driven by a drill press, is compressing a fixed TouchRail spring 5 mm at each cycle. After 100,000 cycles, the spring length remained unchanged. The position of the spring within the TouchRail body was also unchanged. The TouchRail design remains stable after extended use.
"TouchRail Touch Weight Measurements"