a guy here at work was a half a heartbeat away from buying a $400 caliper because he wanted "to measure exactly" I showed him that trick.
--- On Tue, 3/24/09, Bill <[email protected]> wrote: From: Bill <[email protected]> Subject: [Papermodels II 35238] Re: Need help with how to measure correctly... To: "Papermodels II" <[email protected]> Date: Tuesday, March 24, 2009, 11:59 AM 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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