Drac Posted March 25, 2008 Report Posted March 25, 2008 'elp me 'elp me! how do you figure the curvature for the top and bottom of a tapered tube so that when the ends of a flat piece are put together to make the tapered tube they look straight?!?! ack! brain... hurts! the top has to be 24" around and the bottom 17 1/2". Quote frissenfrassenmussafrussen...
Members whinewine Posted March 25, 2008 Members Report Posted March 25, 2008 'elp me 'elp me! how do you figure the curvature for the top and bottom of a tapered tube so that when the ends of a flat piece are put together to make the tapered tube they look straight?!?! ack! brain... hurts! the top has to be 24" around and the bottom 17 1/2". Drac: If I am correct, is this what you want to do: take a flat piece & make it conform to a tapered cylinder with the top & the bottom having the correct curvature so that when made into a cylinder everything lines up? You can do it scientifically by using specially designed CAD programs, slide rules or asking your genius friends if they could help you. Or you can do it the common sense way (which, btw, doesn't always work). Take a tapered cylinder wrap paper around it & fasten (temporarily) with tape trim the top trim the bottom draw the seam line use exacto knife to cut along the seam (cutting both layers of paper) unfurl & you have your pattern (allow extra for the thickness of leather) If this is NOT what you're trying to do, sorry, my bad! russ Quote
Members Hedge Posted March 25, 2008 Members Report Posted March 25, 2008 Your pattern will be a trapezoid. The long side will be equal to the circumfrence of the large hole and the short side equal to the circumfrence of the small hole. The distance between will be the length of the tube. Your cut seam will be made by drawing a line connecting the ends of these lines on each side. ('suppose that's a clear as mud ) Quote
Drac Posted March 25, 2008 Author Report Posted March 25, 2008 whinewine that's pretty much what I wanna do. I'm a computard though so the programs won't work for me and as for genius friends, that's what this forum's for, right? *L* I'd use the "wrap around something" method but don't have anything that coresponds to the correct size. never had a prob with that method so far as long as whatever was wrapped was the correct size/shape. hedge yeah, that's the idea, but I need to know how to figure out the circumference size for the circles so that everything is level once cut. therein lies the rub. Quote frissenfrassenmussafrussen...
Members Hedge Posted March 25, 2008 Members Report Posted March 25, 2008 (edited) C = 3.14159 x dia. (but you already have the measurements you need. 24" and 17 1/2"...right? ) whinewinethat's pretty much what I wanna do. I'm a computard though so the programs won't work for me and as for genius friends, that's what this forum's for, right? *L* I'd use the "wrap around something" method but don't have anything that coresponds to the correct size. never had a prob with that method so far as long as whatever was wrapped was the correct size/shape. hedge yeah, that's the idea, but I need to know how to figure out the circumference size for the circles so that everything is level once cut. therein lies the rub. Edited March 25, 2008 by Hedge Quote
Drac Posted March 25, 2008 Author Report Posted March 25, 2008 hedge hmmm... methinks I probably wasn't clear enough on the bit that I need. if you lay a properly done gauntlet flat for example, the top and bottom are curved. I need to know how to figure the size of those curves. Quote frissenfrassenmussafrussen...
Members Hedge Posted March 26, 2008 Members Report Posted March 26, 2008 Ahhh!! Now, I see what you're talking about. Hmmmm...I've never done that execept by eyeball. Not even sure there's a 'standard' curve to apply. Sorry, Drac. That one's beyond my ken. hedgehmmm... methinks I probably wasn't clear enough on the bit that I need. if you lay a properly done gauntlet flat for example, the top and bottom are curved. I need to know how to figure the size of those curves. Quote
ferret Posted March 26, 2008 Report Posted March 26, 2008 this any help? http://mathcentral.uregina.ca/QQ/database/...2.06/phil1.html Quote Politicians are like nappies, both should be changed regularly for the same reason.
Members whinewine Posted March 26, 2008 Members Report Posted March 26, 2008 Drac: I think what you're gonna need to do is build an actual model. Get, or make, a hoop of the top dimension & do likewise, for the bottom. Find the corresponding height & attach connecting rods, fastened on angles (they will be longer than the height, because they go from the longer hoop on an angle to the shorter hoop- does this make sense?)... If you can construct a model from styrofoam, in sections, using an electric knife, or a lathe-type of arrangement, where you can turn down the styrofoam to the appropriate dimensions, would work...if you want to go to all that trouble... the wraparound method is probably the most sure method of doing what you want. good luck. russ Quote
Members Hedge Posted March 26, 2008 Members Report Posted March 26, 2008 Good show! For some reason I got it in my mind he wanted an angle on the openings. (not good at multi-tasking...like breathing and thinking at the same time! ) this any help?http://mathcentral.uregina.ca/QQ/database/...2.06/phil1.html Quote
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