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About Wolfjk

  • Birthday 03/01/1937

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    Study of dreaming and consciousness.

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  1. Wolfjk

    Centre seam

    Learn from an expert woodworker! A good joiner, wood machinist, violin or furniture maker may show you how to plane a perfect joint. However if you just wnt to be an amateur maker it is the method you find best gives you the satisfaction.
  2. Wolfjk

    Wood ID

    From the grain,colour and size of the block the wood is likely to be plantation grown indian rosewood, commonly called "sonokeling"
  3. Perhaps on the the back of the envelope she wrote: "Dear Sam, The first violin I bought from you was not very good> Would you make me another one at a reasonable price now you're famous?"
  4. How does your rocket fly? There is a reaction to every action.
  5. I'm am a bit surprised at some people not understanding what is happening when a violin is set in motion by being played! I can see clearly that the motion is caused by the sound waves exiting the reeds. The movements are more pronounced at the end grain- F-hole wings and where the arching is steep and exposes more reed endings. The movements are also effected by the way the plate was finished; a sharp knife or plane causes less chaotic movement than sanding or dull blade. The varnish layer, grain filler. and accumulation of dirt and wear also has an effect on the movement. The transfer of sound waves from the bridge to the plate is also a critical factor, so is the sound post stpping/restricting the reeds. Perhaps watching the movements of of the plate in slow motion my be more informative?
  6. Perhaps it the most sensible and most intuitive makers who can perceive it?
  7. Simply put, the lighter wood has larger cell/reed interiors and have more air t-o-wood ratio than closer grained heavier wood. Whichever way we look at it, the air inside the top plate and the internal structure of the spruce/ fir have some effect on resonance.
  8. It is logical to put the wider grain on the bass side as the tree grows faster and the wood is lighter. There is more air to wood ratio in earlier growth.
  9. Hands on experience indicates that once the wood is well seaoned (not just dried but exposed to the natural temperature and humidity changes of the seasons) the difference of expansion and contraction is less than at the start of seasoning. The reason the ribs are more likely to split on the blocks is the orientation of grain; up and across. The contraction/expansion lengthwise is afraction of across the grain.
  10. Hi, If you're planning to make your ribs from the same wood as your back make sure it is well seasoned and should give it at least 6 months to season in a dry place. As Jacob says in his post, slab cut ribs tend to split, especially near corners,top and bottom blocks. But they need a few handred years to do it if the ribs were well seasoned before bending. On the plus side, slabcut wood is a lot easier to bend. You may have to leave the ribs a bit thicker as slab cut ribs have a bit less resistance to downward pressure of chinrests and clamping. There are some slab cut ribs from more than three hundred years ago.
  11. Perhaps a handwritten certificate with your signature is the best and quickest way?
  12. Wolfjk


    There are several Dutch makers (from Holland/Netherlands) who used the method of inserting the the ribs into the back plate, but very few instruments survived due to the backplate shrinking or repairs. There was a presentation in Dartington about these types of violins some years ago.
  13. It would be interesting to see what proportion of the plantation becomes fiddleback maple! All the books I read on the structure of wood indicated that rippled wood is incidental, and from pratical experience I can definitely say that fiddle back figure appears randomly in many different woods from all parts of the globe. The internal structure; figure, texture, specific weigth and medular rays are more influenced by weather and growing conditions. Genetics do influence the shape of the tree if there is no other interference. It is especially obvious in pine fir and spruce. Fruit trees have their own shape as well.
  14. Genetics are widely used in forestry and fruit growing. In forrestry, some trees follow the genetic make up and growing habits of the stock, others do not. It is especially obvious in tropical trees. Plantation grown rosewood and mahogony is inferior to naturally grown wood. See how they do with pernnambuco? If genetics were involved in fiddleback maple, there would have been forrest of it! Some trees don't follow orders
  15. There are quite a few trees I would like to try! Another good thing about Sheffield (UK) is that within 30mile or half hours drive one can see and observe many North American species of trees.
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