Yes it's true. You don't need the absolute number. But it's good to have it because it tells you where you are in terms of the front weight maximum. Since the front weight maximum is an indication of inertia indirectly, it's a good idea to know that number.
In practice, I don't actually use the spreadsheet when I'm doing it this way, I just do it in my head as I'm going, so I'm actually only weighing the front weight once and modifying that based on my original balance weight measurement compared to my target balance weight. I put up the spreadsheet for those who are wondering how these numbers are derived and to illustrate the one-to-one relationship between front weight and balance weight
By the way, speaking of front weight maximums, you can use a version of this sheet to determine your strike weights by pre-setting the front weight at the level that you want say 80% of front weight maximum and then by sample determine what strike weight goes with that front weight to achieve your balance weight. Do that for several samples through the scale and you can use that to establish your strike weight curve either using Stanwood's chart or calculating it. That was the basic idea of the spreadsheet. I posted a month or two ago
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David Love RPT
www.davidlovepianos.comdavidlovepianos@comcast.net415 407 8320
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Original Message:
Sent: 06-12-2025 10:32
From: David Foster
Subject: FW Spreadsheet for Renner KMD
This is very similar to the speadsheet I made up. Except I don't measure the orginal FW. For me, no need to measure twice.
I only want the 'change'. When I measure the key, I'll zero out the scale. Make modifications as needed so the scale will read the 'change' I'm looking for.
Thanks for sharing this.
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Dave Foster, RPT
CAUT Michigan State University
Original Message:
Sent: 06-10-2025 12:52
From: David Love
Subject: FW Spreadsheet for Renner KMD
For those using the Renner KMD device to rebalance actions (or even if you're doing it the old way), here's a spreadsheet that you can use (see attachment). Instructions on the sheet, pretty self explanatory.
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David Love RPT
www.davidlovepianos.com
davidlovepianos@comcast.net
415 407 8320
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