This website uses cookies. By continuing to use our site you declare your agreement. More Information
Dear visitor, welcome to Kartonbau.de  Alles rund um Papiermodelle, Kartonmodellbau und Bastelbogen. If this is your first visit here, please read the Help. It explains in detail how this page works. To use all features of this page, you should consider registering. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.
This post has been edited 1 times, last edit by "KrisR" (Jan 14th 2010, 4:44pm)
This post has been edited 2 times, last edit by "Christian Lorenz" (Jan 14th 2010, 12:45pm)
Source code 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 
h  length of cones wall (not quite height of cone), d1 diameter of upper circle, d2 diameter of lower circle l  perimeter of upper circle L  perimeter of lower (larger) circle We want to draw two concentric circles as on picture bellow. The shaded strip is surface of the cone. [1] l = Pi d1 [2] l = B r [3] L = Pi d2 [4] L = B R where B is angle beta in radians from [2] and [4] [5] B = l / r [6] B = L / R via comparison of [5] and [6] [7] L / R = l / r from picture [8] R = r + h via substitution in [7] of R from [8], and l and L from [1] and [3] respectively, and cancelling out Pi: [9] d2 / (h + r) = d1 / r [10] r = (d1 h) / (d1  d1) The angle B can be calculated from crossmultiplication (Dreisatz) : 360° 2 Pi R B Pi L [11] B = 180° L / R 
Quoted
Originally posted by Christian Lorenz
look here: http://www7a.biglobe.ne.jp/~sfpapercraf…tat/atat.html
Forum Software: Burning Board® 3.1.8, developed by WoltLab® GmbH