Removal of Cast Iron Plate

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A quick look at the top of this piano and it almost looks like a normal, dirty, old piano.

After taking out the action, we can see that the pin block is definately damaged. This was caused by

someone replacing loose pins with oversized pins. The pin block was probably not properly supported during the procedure, or the hole was too small for the the size pin that was inserted.

First thing we do is take out the dampers, while numbering them to help keep them in order.


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This picture shows an old repair that was used in attempt to fix some tonal problems. 

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The picture on the right is showing a process to record the old string scale. The clipped wires are the ones that were measured and recorded for duplication. 

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The bass strings are removed and measured. We then record the speaking length of each string, along with the distance from the front bridge pin to the hitch pin in the back. These measurements alow us to examine the current stringing scale and permit us to examine changes during the restoration that will help improve the “sound” of the piano.

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All the tuning pins come out and the hieght of the cast iron plate is measured. It’s common for us to make a new pin block in complete restorations, so the pin size meaurements are not neccessary. 

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All the screws of the cast iron plate are taken out and kept in order. This is important since there are different lengths and sizes. Also, it helps to use the same screw in the same hold in order to not damage the threads in the wood.

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AFter the bolts are removed, it is time for the cast iron plate to come out. Since I’m usually by myself, the chain hoist is a life saver.

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Finally, the plate is out of the piano. Now it will be time to examine the pinblock by removing it from the plate.

© Joel Klar 2013