![]() Let’s face it, not all piano service people are highly skilled, and occasionally improper repairs are attempted, sometimes causing issues that can’t be easily resolved.ĥ. Poor quality keyboard and action repairs or modifications. 040 inches or 1.0 mm, the keyboard not only looks worn and poor quality, it’s uncomfortable to play.Ĥ. If your keys are narrower than about 0.870 inches or 22.0mm, or the variation between adjacent keys is more than about. The width of the white keys, especially in the midrange can end up too narrow. Worn out keys from over playing or multiple/poor quality keytop replacements (see picture 5 below). When the key can move forwards and back due to the balance rail hole being out-of-round, the pianist feels an uncomfortable loss of control and action efficiency is lost.ģ. With modern parts installed, pianos with a high key ratio will be too heavy to weigh off correctly.Ģ. Many older Steinway pianos have a key ratio of 0.54 or higher. To work effectively with modern high performance 17 mm hammers, most pianos need a key ratio between 0.48 and 0.52. Many older and middle aged pianos have key ratio which is too high for modern parts. (See directions below to calculate your keyboard’s key ratio.) However, long term and/or heavy playing, multiple action rebuilds, improper repairs, age and other factors can cause the valuable instrument you care for to need a new keyboard and action.ġ. Piano keyboards last a long time, even in concert/performance instruments. Other issues such as stack position, we work with you the customer to ensure an optimal new keyset and action rebuild. ![]() Some issues we fix during our design phase automatically. Here are just a few of the checks we run the “magic line” or half strike capstan/wippen friction, action spread, stack position, jack function, hammer bore, and balance rail magic line, and more. This web form includes a link to easy instructions with lots of pictures!Ĭalculating the key ratio and action ratio is just part of our process for designing your new keyboard. To send us data, please use this web form: As part of building a new keyset, RPW calculates and simulates the action ratio with actual parts to ensure a successful action rebuild.Īs a FREE service for piano technicians and rebuilders, we will calculate your key and action ratio for you, and provide analysis with recommendations for improvement. ![]() For a complete analysis we recommend calculating the action ratio or “AR” which involves taking a few easy measurements of the key, wippen and hammer shank. ![]()
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