Peter K-G

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About Peter K-G

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    Life Artist
  • Birthday 06/13/71

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    Violin Making
    Violin Sound

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  1. Basic Acoustics Resource

    Did this once and was very exciting until I started to measure density at home. I had a lot of tops 6200 -6500 m/s but because of the strong correlation with density It is important to get the density too. 2/3 of my pile had 0,50 - 0,56 d. won't make that mistake again. My friends had better luck without the Ipad
  2. Basic Acoustics Resource

    Then by this definition I'm an Amateur
  3. Secrets in the wood (Stradivari's maple)

    Bruce, You have probably answered this question before, but is it through out the wood or surface treatment.
  4. Basic Acoustics Resource

    Smart thinking! I fix two of those parameters; weight & stiffness Arch height is determined by the woods performance and thickness by density
  5. Washing linseed oil

    Kimmo, Some years ago I tested linseed oil for my varnish cooking, domestic linseed oil was the best (Wanha viljami, sateenkaari värit) If you cook it for 4-5 hours in a double boiler, standing on a piece of wood (see last image) you will get a very siccative oil for your varnish, that cures with minimal UV. The color is not that important, it will get transparent in half a year to one year without UV anyway and has no influence on varnish drying time.
  6. Back Plate thickness in question

    Booth with a dG bottom, sounds like a challenge, try spit against the wind sometimes
  7. Stradivari tools, again

    Kimmo, That is amazing work! You could actually make hand made tool sets for other makers. I'm sure it could be a business idea.
  8. Back Plate thickness in question

    I have been following your site for a long time and I thank you for the vast amount of information you have there, from many researchers and MN posters. I know that there are many ways of finding patterns on how to predict the low body modes. However if you want to not predict, but set them +/- 1-3 Hz, there is no other known way than to tune the arching. These are the coupling frequencies (back/ribs) that gives precise B1+ frequencies. (if the arching is tuned, so that the thicknesses are set to the wood's performance and density) Soil #2 Coupling back M1 M2 M3 Ribs 64 g back 100,5 g 308 369 531 Ribs 59 g back 99 g 300 357 524 Top g M2/M5 68,5 148 346 Back 99 184 343
  9. Back Plate thickness in question

    Hi JonathanR, I'm sure your data is right for what you have measured, but unfortunately this is not too reliable. All of my violins fall outside the chart except one.
  10. Stradivari tools, again

    Voin kuvitella ettei ollut helppo tehä. Great work!
  11. Stradivari tools, again

  12. Bass bar tuning

    Back to the OP - It's possible to tune the same top to the same frequency with a 12 mm high bb and a 6-7 mm bb.
  13. Bass bar tuning

    My plan is to speed up this and be famous on MN (before I die)
  14. Bass bar tuning

    I'd say fill them with uretane and put them in a corner, wouldn't you agree?
  15. Bass bar tuning

    Yeah, this guy is on a different level than me. He can even smell the body modes and M5 frequencies