Very Interesting DL. The instructions do say that when the KMD is calling data into the app through Bluetooth that it is a battery hog. Maybe we should keep it plugged in when measuring. I've been talking to Skylar about summer of the discrepancies I've been finding, but I am optimistic about having a device that will clear up some of the measuring discrepancies we already experience. I propose we standardize measuring to the outside edge of the key for more consistency with the distance ratio. The 13 mm the Dom Galt suggested as where pianists play is obsolete. Robert Springer recently suggested to me that we define the distance from the fulcrum and express a true torque measurement in newtons. I agree with him. I think we'll find different specs for concert grands than small baby grands.
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Jude Reveley, RPT
President
Absolute Piano Restoration, Inc.
Lowell, Massachusetts
978-323-4545
www.absolute-piano.com------------------------------
Original Message:
Sent: 02-02-2025 16:25
From: David Love
Subject: KMD Renner Key Measuring Device Comparison to tradional method
FWIW, after reading your post I went to an action that I just done and the measurements were all over the place and inconsistent from one to the next and under what I thought they had been by anywhere from 3-7 grams. I noticed that the battery was at about 60% so I recharged and remeasured this morning and it measured both consistently and accurately when compared with using gram weights. I don't know if that was a one time anomaly or what but I will allow the battery to run down some and try again. Should probably be looked into though.
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David Love RPT
www.davidlovepianos.com
davidlovepianos@comcast.net
415 407 8320
Original Message:
Sent: 02-01-2025 13:28
From: David Stanwood
Subject: KMD Renner Key Measuring Device Comparison to tradional method
I'm starting to take measurements with Renner's new KMD - Key Measuring Device. I'm finding that the results are generally higher by 3 or 4 grams than those taken with the traditional Down Weight by finding the weight that causes the hammer to rise in a controlled motion after a few light raps to get it started and mirroring that motion with Up Weight. I expect the consistency with the KMD will be much less subjective and way more consistent than the traditional method and it's way faster. Any one else have input on this?
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David Stanwood
stanwoodpiano.com
stanwood@t