90 degree elbow

? 90 degree elbow Stake method explain (with formulas)?? What specific methods staked 90 degree elbow is? 90 degree bend in the elbow is very common, so the drawing process 90 degree elbow Stake The method is also important to learn the knowledge of many people. Here, the world's factory Valve Network to find out more calculated elbow staked 90 degrees. ? ?? Bent 90 degrees, diameter 300MM, is cutting: draw a straight line length of Π (dt) (d --- tube outer diameter, t --- thickness). ? ?? To the segment 16 equal portions, from 0.1.2.3 ...... 16. Two Festival lofting straight angle bend calculation formula:?? Yn = r cosα when 0 ° ≤αn≤90 ° when Yn = 1/2 (d-2t) cosα ??? when 90 ° <αn≤180 ° when ? Yn = 1 / 2dcosα ?? where Yn --- expanded view of the circumferential length of Divisions to curve coordinate values;? ??? r --- auxiliary circle radius; ??? d --- tube outer diameter; ??? t --- thickness;? ?? αn --- aliquots auxiliary circumferential angle; 300mm diameter pipe, ?? n optional 16α1 = 360 ° / 16 = 22.5 ° α2 = 45 ° α3 =? 67.5 ° α4 = 90 ° α5 = 112.5 ° α6 = 135 ° .α7 = 157.5 ° α8 = 180 ° ?? formula:? Y0 = 1/2 (d-2t) cos0 ° = 0.5 (d-2t) ?? ? Y1 = 1/2 (d-2t) cos22.5 ° = 0.4619 (d-2t) ??? Y2 = 1/2 (d-2t) cos45 ° = 0.3536 (d-2t) ??? Y3 = 1 /2(d-2t)cos67.5°=0.1913(d-2t)???Y4=1/2(d-2t)cos90°=0???Y5=1/2?dcos112.5°=- 0.1913d ??? Y6 = 1/2? dcos135 ° = -0.3536d ??? Y7 = 1/2? dcos157.5 ° = -0.4619d ??? Y8 = 1/2? dcos180 ° = -0.5d?