My Math Forum Deriving Equation for Intersecting Cylinders Surface Area

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 March 9th, 2016, 12:12 PM #1 Newbie   Joined: Mar 2016 From: Virginia Posts: 3 Thanks: 0 Deriving Equation for Intersecting Cylinders Surface Area I'm really struggling in trying to find an equation to describe this part it terms of surface area (material useage). Variables, as seen in the picture, are d1, d2, d3, and (a) angle. L1 is not a variable and neither is branch length, both can be calculated from the previous noted variables. Any help in figuring out an equation, or at minimum pointing me in the correct direction to get started would be much appreciated! TVRU by MearnsQuail, on Flickr Last edited by Mearntain; March 9th, 2016 at 12:17 PM.
 March 9th, 2016, 01:51 PM #2 Senior Member   Joined: Jun 2015 From: England Posts: 704 Thanks: 202 Neither barrel length nor branch length can be calculated from the variables give. They could indeed be given constants however. What about the offset?
 March 10th, 2016, 04:18 AM #3 Newbie   Joined: Mar 2016 From: Virginia Posts: 3 Thanks: 0 L1 = ( d3 * ( 1 / sin a )) + 4 Branch Length = [({( tan a * 2.5 ) + ( d3 * 0.5 )} / tan a + (( d1 * 0.5 ) / sin a ))] - ((( d1 - d2 ) / 4 ) / sin a ) Offset = L1 - (((d1 / 8 )) / tan a + (L1 / 2)) (I know these equations can be simplified down a little more, but just assume those three values to be constants) Last edited by Mearntain; March 10th, 2016 at 04:32 AM.
 March 15th, 2016, 06:03 AM #4 Newbie   Joined: Mar 2016 From: Virginia Posts: 3 Thanks: 0 bump

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