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Showing results for tags 'humidity'.
I keep thinking about the fact that arching rises and lowers with the season, and we have to adjust posts because they don't change with the seasons. Is anyone aware of experimentation with posts made in a way so they expand and contract somewhat with humidity changes? I know there's some debate over the material of the post, and whether it has a tonal effect. If sound travels faster along the endgrain of spruce, then it's an obvious choice. I've heard some well renowned people argue on either side of the question of whether more or less dense posts actually effect the tone. Me experience suggests that the material does influence the sound (I recognize it may be my expectations guiding my perception), but the arguments to the contrary have been compelling. If material choice doesn't effect the function of the post (within reason), then I would think that a grain orientation that has the endgrain facing East-West rather than Up-Down would cause it to expand and contract similarly to the changes in arching. Of course the most obvious structural issue with this orientation is the tendency to split the post, but I imagine a washi paper wrap would keep it secure. The other issue might be a tendency for the post to flex thereby absorbing some of the energy that would otherwise transfer through the post. In any case, I probably won't make it back to weigh in on this any time soon, but I thought some others on MN enjoy speculating on the subject. I'd love to hear any real experience related to post material choices.
Hello everybody, this is my first post on Maestronet, although I have enjoyed following many discussions. I'm making a new cello for a customer and I've just completed the varnishing process. When I went to string it up, I realized that the projection had dramatically changed from 80mm to 92mm. As I do for all my instruments, before starting to varnish, I set up the cello and had it played for a week in the white. As everything was fine I removed the whole set up, including the fingerboard and post and began the varnishing process. It took almost two months and half of the time it was under UV light where I kept the cello humidified. Throughout the two months I had issues with some persistent open seams which I attributed to heat in the UV cabinet. Since I discovered the projection problem I removed the front for a thorough inspection and found the front arching quite distorted. All the corners, specially on the treble side, curled up and the cross arching had flattened, causing the f-hole wings to raise above the central area. I measured the arching heights both top and back and found that they had dropped by 3-4 millimiters. Since then I clamped the front onto the ribs to keep it flat as well as setting the old post, which I had to cut down a couple of millimiters in order to stand it up. In the last 5 days I've managed to gradually pull the post to its correct position and that has helped the projection to go down by 5mm, so that it is now 87mm. I was told by the supplier that the wood was seasoned and ready to be used. I haven't glued the top back yet and am wondering if this has happened to anyone here. Any suggestions would be most welcome! www.protaniviolins.com