Periodically your piano will require the adjustment of it mechanical parts to compensate for the effects of wear, the compacting and settling of cloth, felt and buckskin, as well as dimensional changes in wooden and wool parts due to changes in relative humidity. This series of adjustments is know as regulation which involves three systems of your piano: then action, trapwork and damper system.
The action is the mechanical part of the piano that permits efficient transfer of power from the fingers on the keys to the hammers that strike the strings. We have technical drawings available for both vertical and grand actions. Consisting of over 9,000 working parts, the action requires adjustment to critical tolerances to properly respond to a pianist's performance. Because the piano's action will go out of adjustment slowly over time, you may not notice accumulating sluggishness or unevenness as it occurs. Your student's performance, however, will be affected dramatically. No amount of practice will compensate for a poorly maintained action. Poor legato touch, chord playing where all the notes of the chord don't speak clearly, a gradual loss of subtlety in phrasing, and an inability to execute quick passages or note repetitions evenly may be the fault of the piano -- not the student. Smooth, even playing is as much a function of a well-maintained action as a well-rehearsed student.
The trapwork is the assemblage of levers, dowels, and springs that connects the pedals to the action. The damper system is the mechanical part of the piano that stops the motion of the strings and is controlled by the keys and pedal system. Incorrect pedaling techniques may be related to poor regulation of the trapwork or damper system. Fine adjustment is essential here if you are to teach the nuances of pedaling to your students.