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65 grams weight for key balance

65 grams weight for key balance

Delivery charges may vary from one shipment to another. We will confirm these fees with you before proceeding with the payment.
Instructions for Key Balance Optional 65 Gram Ring

Purpose - To extend the measuring range of the Key Balance to measure and diagnose upright damper spring tension from the front of key.

Using the Ring Conversion Scale - Slide the 65 gram Ring over the brass stub and position over the key that is being tested. With the damper engaged ( do not depress the sustain pedal), slide the indicator in the normal manner until the key drops to the point of escapement. Take the reading on the scale. Use this number on the left side of the conversion chart affixed to the ring.

Example: If the balance reading is 50 grams, the conversion is 80 grams. This would be the combined value of both the action and the resistance of the damper spring.

This is a diagnostic tool. You may subtract the down-weight value from the combined value to determine damper spring resistance at the front of key. In general, if the damper spring alone is as strong, or stronger than the down weight, then the damper spring tension is too high for smooth regulation and adds unnecessary touch weight.

Example: If down weight is 55 grams, combined weight is 115 grams, damper weight is 60 grams

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Delivery charges may vary from one shipment to another.
We will confirm these fees with you before proceeding with the payment.

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Pianos Bolduc, manufacturer of fine piano components, maker of specialized tools, and major piano re-builder distributes parts and supplies for piano technicians and rebuilders around the world. This catalogue has been specially designed to serve piano technicians, re-builders, and manufacturers. For technical advice, please do not hesitate to contact us by e-mail (info@pianosbolduc.com).