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Greg Sigworth

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Everything posted by Greg Sigworth

  1. Thanking for sharing that experience. I would never have come to that conclusion without hearing it, and then I might still have not realized it fully. Thank you for that.
  2. I got this peg shaver given to me 40 years ago and it is all I have used, maybe on 20 violin peg sets. I followed H.S. Wake and made the edge 5 degrees so it is almost a scraper. When it is sharp it works well and I cut/scrape thin amounts and use dry soap bar for lubrication. Maybe your peg shaver will work with that kind of edge. I have never tried to use something else because this works and I do not do this for a living.
  3. Absolutely, or are you seeing the earth revolve on its axis? All descriptions are true from their own reference point.
  4. One's frame of reference is irrelevant in the explanation of a physical phenomenon. Any correct analysis including vector analysis will come to the same answer regardless of the frame of reference if done properly. Do the blocks move or does the sound post move? Both are true and the language depends on the frame of reference and the coordinate system coming from that frame of reference. To say that one frame of reference is the only correct one any everyone else is wrong is incorrect and anyone who has had any engineering training knows that. One usually chooses a reference point and frame of reference that simplifies the analysis and makes the math easier to work with.
  5. I redid the test to see the penetration of the stain in both early and late wood. I prepared the surface with a 2& 1/2" plane blade which was very sharp and used a slicing motion to try to eliminate crushing of the softer wood. The two pictures given show the same general penetration as before with some heavier later wood having absolutely no penetration at all. I can not explain that? I would like to talk to a well educated forester about this.
  6. I used a small block plane to cut the surfaces originally on the end. Maybe there was some crushing and burnishing going on. I will try to do it again using a very sharp tool with a slicing action.
  7. I applied some Ultra Penetrating Stain from Mohawk on the end of spruce billet and shaved off some wood on both sides. The later growth is harder but appears to be more porous allowing fluid to penetrate deep. This penetration was observed only when the ends of the late wood was exposed like at the ends or where the grain exited the surface exposing an end of the cells. The late wood appeared to be very good at transporting liquid up and down the tree.
  8. A few years ago I experimented to see the degree of penetration of thin varnish into sealed spruce by putting strong coloring into the oil varnish and then later exposing a plane normal to the surface to see the penetration. To my surprise I found that the penetration was greatest along the lines of the late or winter growth rings. These dark thin rings were very porous and were paths of fluid penetration sometimes 10X more than the softer summer wood. I would have thought that the larger softer cells would have had the greater penetration.
  9. Maybe we should ask the guy with the beard in the second picture what is the correct plural form. I would guess he is American, maybe from the hills of W. Virginia, a very interesting looking fellow; but you never know he might be from some place in Europe.
  10. The word for "cello" is actually violincello, if we really want to be correct. Cello does not appear in the 1828 dictionary by Noah Webster. The modern dictionaries all give cellos as the plural with celli as an accepted form. Since I only have one cello I will not choose a plural form, but being accurate in English is always a good thing to do. Interesting word study so thank you Jacob for mentioning this.
  11. It looks like the whole scroll is warped resulting in the nut, all four pegs and scroll head being tilted in the same direction. Yet the main body is not distorted or warped. Could the neck and scroll have been made of unseasoned wood that distorted after it dried? Are there any other photographs to look at this area?
  12. If this hair comes mostly from dead horses and say you get about one pound per horse and then say 5% of the horses die each year there must be a lot of horses living in Mongolia: somewhere around 40 million, and that assumes all dead horses give to the hair bank!
  13. Very interesting observation. Is it important then for the ribs to provide stiffness to the outer edges of the plates so that sound producing vibration is more centered or generated on the interior of the plates? What do you think?
  14. This is about hearing aids for musicians/makers. I have high end Oticon aids which I was able to purchase through my retirement medical coverage. When testing violin plates with a constant high frequency note or playing almost any note on my cello without vibrato the sound I heard was wobbling in volume. There was some kind of feedback causing this. If the music did not have long duration notes or vibrato then the problem was diminished or not noticed. Has anyone else with aids had this problem and if so were you able to eliminate it? Thank you.
  15. Thankyou for this discussion and the suggested videos and other sources for explaining this problem and solutions in stringed instruments. I believe that I now have a good basic understanding of this problem.
  16. How about all natural or "organic" violins as opposed to ... eh...eh.. or whatever the others are.
  17. Especially in Texas!
  18. Assuming the cello's stay in the same hands, when the cellos are turned with backs towards us, the distortion would be reversed from what we see if it is real shape and not camera distortion. So this must be a camera distortion.
  19. Thank you for your input. This is a bit off topic, but how do you flatten two joined plates after joining. Do you simply use a smaller leveling plane and a good straight edge? Thank you.
  20. Thank you for this insight. Would you suggest putting one of those packets which absorb moisture in the case to avoid this problem? I have shipped a few violins and will probably do so again.
  21. I wish you, your families and loved ones to be blessed at this time of the year and thank you for all the sharing your lives and knowledge. Merry Christmas to all!
  22. I didn't realize the poster scroll was not to scale. I haven't got to using it yet. If you do get the scroll pattern could you share the outline? It would be a great help. Thanks
  23. Another way to say this is that the elastic coating can store up more energy and give back most of it minus some damping, the soft/plastic coating can not store up energy, but it eats it up so that it does not go back into vibration. If you bend a coat hanger a number of times it gets hot. the mechanical energy is turned into heat energy. Good spring steel if it is not overbent will not show this increase of temperature.
  24. Now we are starting to think. Elastic vs. plastic is hard verses soft. The elastic material strains and stores energy and when it relaxes the energy is given back in the form of kinetic energy which is where it came from; the vibration of the plates. Soft or plastic material has a very low elastic yield and gives way when strained; but when the the force which caused the bending is released the material stays bent; it has absorbed the energy and does not give it back as kinetic energy or vibrational motion. This is the essence of damping.
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