I know there is a formula, I was taught it in the RAF for bending metal and it has something to do with bend radius but I cant remember what the formula is, but the twice thickness seems to work well. Never thouight of using a stack of 100 sheets before.
On Mar 24, 2:23 pm, [email protected] wrote: > what are you talking about Bill? > > you got it right ;))) > think of the paper as 3 dimensional, just like it really is, each cylinder > has and inner diameter and an outer diameter. the outer diameter is 2X the > thickness of the piece of paper from the inner diameter. > > now watch carefully the old formulas, only make sure you use ID or OD (inner > diameter or outer diameter) for the next cylinder depending on which cylinder > is on the inside vs outside. > > Oh, and trick #2: don't try and measure the thickness of a sheet of paper. > stack 100 sheets, measure that, and then divide by 100. > > much more accurate. > > --- On Tue, 3/24/09, Bill <[email protected]> wrote: > From: Bill <[email protected]> > Subject: [Papermodels II 35227] Re: Need help with how to measure correctly... > To: "Papermodels II" <[email protected]> > Date: Tuesday, March 24, 2009, 10:16 AM > > You know there is a formula for calculating the extra you nee to add > and for the life of me I can't remember what it is. I can only > remember when I made the Shuttle ET and SRB's that any thing that > wrapped around the ouside of the ET or SRB was twice the thickness of > the paper longer. John leslie is the man for maths things I'm like a > caveman at the side of him where math is concerned. > > On Mar 24, 11:53 am, abbe <[email protected]> wrote: > > > > > Hi Bill, > > You bring up a very good point here which also is perplexing to me... > > how do I measure for the paper? I do come out short at times- how do I > > know exactly how much room to leave? Would love to hear the solution > > if you would be so kind? > > Thanks for bringing it up. You know, I spend so much time trying to > > calculate things (usually it ends up to be visually though) and it > > doesn't work sometimes, so, any info from anyone is very, very much > > appreciated- it's funny but I figured out very complicated > > tessellations this way where I came up with these realistic design > > patterns- everyone was amazed that I could do this visually. In school > > years ago I was so bad at math and here I could come up with these > > tessellations. It even surprised me! > > Anyways, I always love to learn new things to put into effect! Thanks > > so much for your help! > > abbe > > > On Mar 24, 5:24 am, Bill <[email protected]> wrote: > > > > Plus twice the thickness of the paper if you want it to go around the > > > outside of a tube/drum. > > > > On Mar 24, 6:25 am, "Paul McCool" > <[email protected]> wrote: > > > > > Ok, time for ME to go back to Geometry class.... > > > > > Paul M. > > > > > ----- Original Message ----- > > > > From: "Wolfgang Holzinger" <[email protected]> > > > > To: <[email protected]> > > > > Sent: Monday, March 23, 2009 11:21 PM > > > > Subject: [Papermodels II 35211] Re: Need help with how to > measure > > > > > correctly... > > > > > > Hi abbe > > > > > >> I'm kind of new to this and need some help. I am > trying to make a > > > > >> straight piece so I can put it around a circle (like > how a drum would > > > > >> look)- can you tell me how I should mathematically > measure this > > > > >> please? Anyone know? I remember that it's a formula > of some sort- just > > > > >> forgot what it was. Thanks ahead of time. Also, I am > creating a hand > > > > >> our of paper and it's not going to well I am having > problems > > > > >> determining how to measure for some of the fingers? > Anyone have any > > > > >> suggestions? Hope someone will have some very good > > advice for me here. > > > > > > > > Let me see if I got you right (take a look at the attached > > > > > picture): > > > > > - you have the circle plate (green color) with a radius > (white) > > > > > - you want to make the strip (yellow part) and need the > length of it > > > > > If that is all you can calculate: > > > > > length of strip: l > > > > > radius of circle plate: r > > > > > pi is a mathematical constant: 3.141592653... > > > > > (If you don't know the number there is an easy way to > calculate: > > > > > take the numbers 1 3 5, double them 113355 and then > divide > > > > > 355 by 113 resulting in 3.141592920353982301 which is > very > > > > > close to pi) > > > > > > Then the formula is: l = 2 * r * PI > > > > > > Hope this helps > > > > > > Best regards, Wolfgang > > > > > > PS: I found a very good article about the number pi on > > > > > wikipedia (http://en.wikipedia.org/wiki/Pi) > > > > > > -- > > > > > MfG Wolfgang Holzinger > > > > > E-Mail: [email protected] > > > > > > +--------------------------------------------------+ > > > > > | Linux -- because life is too short for a reboot! | > > > > > +--------------------------------------------------+- Hide > quoted text - > > > > > - Show quoted text -- Hide quoted text - > > > - Show quoted text -- Hide quoted text - > > - Show quoted text -- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Papermodels II" group. 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