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Showing results for tags 'projection'.
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I am building a cello so I Have lots of questions. For the most part the answers have been straight forward, But on the subject of string angle over the bridge, overstand, and fingerboard projection I am hearing quite a variety of things. Questions: 1. Is 153o standard no matter what?, or does the angle change proportional to the arch height. I would imagine that it is standard, but I don’t know. I noticed at the end of Yo Yo Ma playing The Swan he turns sideways for a straight on\side shot of his cello, it looks as if it has a fairly low arch, it measured at 153o or so. 2. I have been told a stand height from 19 to 27 without any regard to arch height. I realize there could be different ways to measure, (I would assume top of plate edge to glue line under fingerboard.) I have heard to make it 25, project to 80 or 81, and don’t worry about the angle over the strings. I do worry about it. To me the stand height and the saddle are used to accommodate the proper string angle. 3. 80 or 81? I would say 82 or 83? ,,, to allow for settling?. 4. Is there a reason to make the angle greater or less than 153o? I would appreciate any insight on these matters, String angle over the bridge, Stand height, Projection,, Is the string angle is ever varied and when? I would like to get this neck set in a couple of days and I still feel like I’m in the dark. I’ve heard too many conflicting things,, I give. For what it's worth it has 1740 montagnana proportions with a 29-30 arch height. Thanks for your time and patience and knowledge.
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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
