![]() On the bass and treble end of the frame, agraffes are screwed into the frame. The pinblock is fitted beneath the frame across the front ![]() Soundboard, allowing more sound waves to escape. Holes in the top of the frame, called the web, open up more of the surface area of the It is important that theįrame mask as little of the soundboard as possible. Several bolts in the middle of the frame pass through holes cut in the soundboard, and secure the frame to the inner supporting posts. The perimeter of the cast-iron frame is bolted into the backįrame of the piano. Withstanding string tensions of up to 70,000 pounds! The big sound of the modern grand piano (follow the link for more information on the history of the frame). ![]() The development of the cast-iron frame in the mid 1800's allowed the strings to be held at a much higher tension, resulting in ![]() In order to prevent this warping, the strings had to be kept at a lower ![]() Metallurgy, the frame was made of wood, which would bend and warp under high string tension. The cast-iron frame, also called the plate or harp, is responsible for sustaining the massive tension of the strings. The Cast-Iron Frame Support for the Strings ![]()
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