#51
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This is rather specific thing. This set used in shipbuilding drawing when I was a student in late 70th and draws made by hands. If you want to make part of this set for yourself, I could send you a file in .cdr format which my friend used to cut off this curves by CNC mill. My curves had been cut off from organic glass 2 mm thickness.
This is a picture of the original Copenhagen curve set.
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#52
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This is my Copenhagen curves set which I made for paper modeling.
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#53
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Dane, that would be greatly appriciated. I have access to CNC and I could easily get those made. I'll PM you my email address.
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#54
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Ok. I will be very glad to help you.
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#55
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I bought a few architectural models from a hobby shop in Sunnyvale, California in the late 1960s. I built 3 of them and still have them (I showed them at the recent IPMC convention). The terrible picture is of my three “antiques” and they’ve held up pretty well. I drifted away, then got back into it some years ago when I found that the IPMC was near me. I attended and have been going and building ever since. I’ll build almost any subject, but have been concentrating on 1:25 tanks lately. P.S. in the background is my current project, the Italian L6/40 light tank.
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#56
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My paper modeling history follows a very crooked path through the magical forest of model building. During World War II, the only reasonably priced model aircraft “kits” were paper cut out or cardboard “punch-out”. My Dad would bring one home on special occasions and he and I would build it together (he would do most of the building; especially the cutting). I was good at holding the glue joints together while they dried. The war ended and plastic models appeared in stores. My Dad was a multi-talented individual and one of his talents was painting. He taught me how to paint aircraft insignia and camo using brushes that had been reduced to 2 to 5 hairs. The pictures below show some on my work on 1:72 scale models. Pretty sloppy, compared to my Dad’ precise hand, of which I have no pictures. Needless to say, I decided painting was not my bag and I turned to wood models (I was a builder; not a painter). Then as a Midshipman on a training cruise in 1956, the ship docked in Hamburg and I visited some of my Dad’s cousins. One of them knew that I liked building models and gave me a sealed cardboard tube to take back to my ship. He advised me to not open the tube until I returned home. That didn’t happen! As soon as I got back on board the ship, I opened the tube and found three beautiful, highly detailed, paper ship model kits. During my summer leave, I built them and was hooked! The problem was, I could not find any decent paper model kits in the model shops in the small town of Annapolis, MD or my home town of Tuscaloosa, AL. So, I went back to plastic for aircraft and ships and scratch building card models using 4 view house plan drawings from Good Housekeeping magazine (see the last few photos below). Years later, after buying a home computer setup, I stumbled across the PMI and Fiddlers Green sites. That was the bomb that burst the dam. I never looked back. I have about 75 plastic and resin model kits sitting in a cabinet collecting dust and hoping for one of my grandchildren to lay claim to them.
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#57
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Thanks for mentioning this. I'd never heard of København (Copenhagen) curves before. Could you explain how you use them for cutting?
I've attached an example of something that I couldn't get to work well with French curves or a bendable curve. This is a common graphical method of constructing a circle and putting it into perspective. It is only approximate. When projecting a circle using the perspective projection, the resulting figure will always be an ellipse. I could never get the curve through the points p7, p23, p16, p4, p17, 18, p5, p19, p20, p6, p21, p22 , p7 in the perspective drawing to look very elliptical. In figures 1 and 2, the red curve is the path through the points. While 12 points is not many for determining a curve, the result looks pretty good. When you're doing it by hand, plotting 12 points like this can be pretty tedious. In figures 2 and 3, the violet curve is a circle generated in the normal way, using one of the equations for a circle. Especially when magnified, it shows clearly how approximate this construction is. The thing that bothers me about French curves is that while obviously the radius of curvature changes continuously, I could never find any information about what the radius is at any given point and according to what rule it changes. |
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