Hey, today I tuned the last 3 bars of the lowest octave, D, C# and C. And again, these bars needed a slightly different approach, this time making full use of all that Bork's paper had to say about tuning: How to get the f10 down without lowering any of the others.
Here are some pics of the D:
That is the D bar after full triple tuning. Note the deep groves at each end of the bar: This is the groove that lowers the f10 without interfering with f0 and f4. In addition, the final few Hz down for f0 were done with a scraper, see the very thin groove in the center. The rest of the bar followed the approach 6mm across the arc, then down between the areas for f4, and then f10/f1. Behind is the diagram that proved to be of great value while tuning the bars. Thanks, Mr Bork :).
Here are the spectra of the D-bar during tuning, with the final measurements of D:
Next: 2 bars have to be redone, the F# and G of the 2nd octave. No fix could bring freaky F# back to normal again....
Stay triple tuned! Soon, the marimba will be finished!
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