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Analysis Overview: This report presents an analysis of the KMD touchweight curves. The data includes force-displacement measurements that characterize the feel and consistency of the piano's action across the entire keyboard. Aftertouch characteristics are calculated from the data by calculating the distance the key travels from peak force exertion until sometime near the end of where the KMD passes its downweight threshold and stops pushing. We also attempt to discern the damper lift point and weight of the damper (as felt at the key). Note that the KMD calculates down and upweight by examining the 2-4mm position, so if you have the dampers involved while measuring and they lift before 4mm, your touchweight statistics will be skewed by the early damper weight coming on.
Interactive Visualization: Use the slider below to explore the touchweight curve for any key on the piano.
These interactive dot plots show key measurements across the entire keyboard. Hover over any dot to see the note name and exact value.
This interactive plot shows all downweight curves (key press down) across the entire keyboard with a color spectrum from red (bass) to violet (treble). Use the slider below to highlight individual keys and see their curves in context with all others.
| Note | Key # | Issue |
|---|---|---|
| Damper lifting before 4mm on 69 keys - KMD reported statistics will be incorrect | ||
| Damper lift is early: 37% through the hammer travel. | ||
| Excessive differences in neighbouring damper weights (noted in red on graph above). | ||
| D#3 | #31 | High friction: 30.0g (>27.9g) |
| F#3 | #34 | High friction: 31.3g (>27.9g) |
| G#3 | #36 | High friction: 28.5g (>27.9g) |
| A#3 | #38 | High friction: 28.5g (>27.9g) |
| D#3 | #31 | High downweight: 93.4g (>91.4g) |
| F#3 | #34 | High downweight: 95.3g (>91.4g) |
| G#3 | #36 | High downweight: 95.5g (>91.4g) |
| A#3 | #38 | High downweight: 98.2g (>91.4g) |
| F#4 | #46 | High aftertouch: 1.74mm (>1.66mm) |
| G6 | #71 | High aftertouch: 1.81mm (>1.66mm) |
| A#0 | #2 | Low key travel: 9.23mm (<9.25mm) |
| D#2 | #19 | Low key travel: 9.20mm (<9.25mm) |
| F#4 | #46 | Early set-off: 7.72mm (<7.93mm) |
| B0 | #3 | Late damper lift: 3.85mm (>3.83mm) |
| A#4 | #50 | Early damper lift: 2.34mm (<2.40mm) |