<\/a><\/p>\nMy plan was (if the center of rotation would have messed up the “axial straightness” of the truss-rod) that this would allow compensation of the flex of the neck in both directions. But since the center of rotation does not make a difference, one could use either the above design or bolt TWO beams onto the top one and route a rod between them as a traditional truss rod. Alternatively, bolt two beams onto the top using the above design – this would allow adjustment of the torsion of the neck as well! One would have to consider weight though.<\/p>\n
I went out and bought myself a copy of the old book of formulas for mechanics that I had in school 25 years ago (glad it was still in print) and did some very rough calculations on the deformation of a neck.<\/p>\n
Assuming a string pull of 40 kgs ~ 400 N and a distance between string and fingerboard of 2 mm, then the a torque of 800 Nmm that is trying to pull the neck upwards. The deformation f is (M \/ 2EI)L^2. Assuming the most basic case of a neck that is rectangular in shape, the value I is bh^3\/12 where b is the width and h is the height. So, let’s assume we have a rectangular neck that is 5 mm wide and 15 mm high. This gives us I = 1406. For aluminum, E is 70000 N\/mm^2. L, the length of the beam (i.e. neck), is 490mm. f = 800 * 490^2 \/ (2 * 70000 * 1406) = 0,97 mm. So, an aluminum beam 5 wide and 15 mm high would be bent about a millimeter by a set of .009 – .042 strings. It looks like it should be possible to create a neck without truss rod with reasonable comfort. I will do some more calculations though, before deciding… For instance, a 10×10 rod would be deformed 1,64 mm, which is way too much.<\/p>\n","protected":false},"excerpt":{"rendered":"
I have been thinking a lot about what the twisted neck design will do to the stability of the neck and the truss rod. I did some sketches to see how the center of the rotation would affect the neck. The picture above shows a twisted fingerboard seen from the short end. The leaning lines […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/posts\/38"}],"collection":[{"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/comments?post=38"}],"version-history":[{"count":0,"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/posts\/38\/revisions"}],"wp:attachment":[{"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/media?parent=38"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/categories?post=38"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/guitarworks.thestrandbergs.com\/wp-json\/wp\/v2\/tags?post=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}