Key lead expansion, keys un-level, swelling
Printed From: Singapore Piano Shop
Category: Piano Forum
Forum Name: Piano Clinic
Forum Description: Piano Tuning and technical-related issues. Popular topics include problems of Steinway, YAMAHA, KAWAI...
URL: http://www.pianoshop.sg/forum/forum_posts.asp?TID=144
Printed Date: 09 Jul 2025 at 7:53am
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Topic: Key lead expansion, keys un-level, swelling
Posted By: StevenKoh
Subject: Key lead expansion, keys un-level, swelling
Date Posted: 03 Dec 2019 at 11:29am
  Leads weights have been used in piano keys since the first pianos. The piano key needs to return after being played and the lead weights help to return the keys to the standing position. Normally the key leads are placed in the middle of the wooden key toward the end. Confusing isn’t it. Well have a look at this video and you will understand more. The problem with lead in the piano Key is that the piano lasts too long. The lead corrodes and starts swelling. This bulges the key making the keys un-level and then they swell sideways. This causes the keys to rub together and stick. Badly corroded leads can cripple the playability of a piano. |