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Oded Kishony

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    Central Virginia, USA

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  1. You know....... violin color ;-) ”Golden “ brown ok
  2. There is an historic sealer that consists of hide glue and alum. Whatever it is it was applied as a paste. I’ve seen photos of drip marks inside the ‘Il Cannone’ but they are very different, a highly colored liquid that penetrated the wood. Oded
  3. Greetings: recently saw a photo of the interior of the Messiah (Strad), it showed a thick, crustaceous, white residue, all around the F hole. one has to believe it is original.
  4. I use a baby bottle warmer with adjustable temp. They automatically shut off if they run out of water and a recycling feature that returns the bath water to the pot so it doesn’t evaporate too fast. Keep it on warm then crank it up when you need it. you can often pick these up at yard sales etc.
  5. I would not bother with the sticlac color but make the varnish with the pernambuco (and madder and other color sources like rosewood and perhaps walnut hulls) and lay down many layers of ‘water thin’ varnish. Place the dry ingredients in a silk screen bag or a womans’ Stocking foot. Use it like a teabag in the alcohol. The wax in the shellac can be helpful in improving the brush ability of the varnish but removing some of it will help clarity. I varnished half a dozen instruments this way in 1987 and the ones I’ve seen, have stood up very well. this type of varnish is pretty soft and takes a while to fully harden. It will take a while for the instrument to sound good, the soft varnish can mute the sound for a while.
  6. Good job Don, you’ve managed to slander Stradivarius’ name with your snide, fact free, sneering innuendos. Congratulations
  7. In my experience instruments with higher plate weights/stiffness are more challenging to play but often have a greater range of tonal colors. I guess it's time for my annual rant..... I pay attention to weights and tap tones and like to get within what I consider an acceptable range based on the s.g. of the wood I'm using. The quality of the sound of an instrument depends on not only the frequencies of the radiated sounds, but as importantly, the relative amplitude of the frequencies. Then there is also the effect of the stuff between the ears that is critical as well. Oliver Rogers wrote a paper (one of his last) illustrating how a viola he was playing sounded wonderful playing in one key but sounded quite bad in a different key. He demonstrated that the viola had sonic holes in the frequencies of the second example! There is no way to closely control the frequency amplitudes in the spectrum of an instrument through plate tuning. The only way that I know of exerting any control is by removing wood from the exterior of a set up, tuned unvarnished instrument. Yes varnishing does change things a bit, but a clear sealer reduces that effect and an instrument that sound good unvarnished should sound good after it's varnished (change your varnish if you don't agree) Scraping any particular spot will affect multiple modes simultaneously and while one can perhaps discern that 'something is different' this random tinkering is mostly useless. In order to affect the timbre of the instrument the changes need to be focused. I believe that the great violinamakers of the past may have accomplished this by setting up their violin, tuning it and finish scraping while listening to the open strings vibrate to the fundamental and harmonics. Modern violinmakers can use a spectrum analyzer in a similar way. As the instrument is scraped one can see sets of frequencies responding and changing as the location of the scraper changes. If the area is further thinned an increase of amplitude can be observed. Here is what I believe is an example from a great violin. (Messiah by Strad) I was struck when I saw these ripples because this is such a typically acoustically sensitive area of the violin. This is exactly what it looks like if you're trying to affect the tone of the instrument from the exterior! Oded Kishony
  8. “it’s only a violin” I.e. not a sacred relic..... oded
  9. Yes, this wedge is used to level a 'step' in the plate. It's easier to visualize if you think of getting the two sides to first line up, using your fingers, then inserting the wedge, effectively making one leg a little longer than the other. It works, even if it doesn't seem obvious. The over sized hole is on the lower thumb screw, on the knurled side, to allow the towers to 'rack' a bit, otherwise they would always be perfectly parallel and you couldn't correct the arch. Oded
  10. a couple of points: after very carefully lining up the crack (dry, no glue) I glue the cleats in place. This holds the repair in place when I later apply hot glue on the varnished side. I sometimes loosen the upper screw a bit and ‘pump’ the glue into the crack and then reset the screw, always checking for alignment. I use 3x5 card stock for the paper at the base of the pillar. To speed things along I put a dab of very thin hide glue on the plate and use ca glue on the pillar to get an instant bond without introducing ca glue to top wood. I like using the magnets, despite the fact that they can be a bit tricky, because they are light weight and this clamping method does not impose any torque on the plate and allows you to more easily handle the plate. Oded Kishony
  11. I got my magnets from K&J Magnetics. https://www.kjmagnetics.com/proddetail.asp?prod=D84PC-BLK The thumb screws, both brass and nylon can be purchased from an industrial supply like MSC or Grainger https://www.grainger.com/product/GRAINGER-APPROVED-Thumb-Screw-4NHT8 or on Amazon https://www.amazon.com/Knurled-Head-Thumb-Screws-Machine/dp/B01729GGR2 or nylon ones at Home Depot https://www.homedepot.com/p/Everbilt-8-32-x-1-in-Nylon-Knurled-Head-Thumb-Screws-2-Pieces-26388/202209622 Oded Kishony
  12. Would your measurements reveal improved responsiveness? Did you check for that feature? OK
  13. I've tried various versions including an off center motorized twirling device clamped to a cello bridge. It made a huge roaring racket. Didn't seem to help the instrument very much (didn't hurt it either) I met a vioinmaker, years ago, who connected a violin to a radio via speaker driver with a stick glued to it, touching the side of the bridge. He claimed that when he first set it up he had to crank the volume all the way up to get any sound but over time he was able to reduce the volume setting significantly and the instrument worked very well as the 'cone for the speaker. Or you could try Micheal's gizmo. I don't think it matters too much what you play through the corpus (Limbaugh will ruin it though ;-) but this is something you could do that will not offend your wife since it will just be another audio device playing. Oded
  14. This photo illustrates how you can use this clamp to align a crack that has a 'step'. Notice on the right side of the crack is a narrow wedge that pushes against the screw shaft effectively pushing down that side of the crack. To glue the pillars in place I put a dab of thin hide glue with my fingertip on the surface, let it dry a bit and use ca glue on the pillars that are surfaced with paper (I use 3x5 card paper). Oded
  15. I use this flanged nylon knurled screw and a brass version with the corresponding tap. The lower screw is used to pull the clamp together, so the hole on the left is slightly oversized to allow for some degree of movement and the opposite side is drilled through and tapped. The upper part, drilled and tapped on one side, is used to spread the clamp.
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