Spirals and Scrolls Part I of Two
Demonstration by Jock Dempsey.
http://www.anvilfire.com
December 15, 1999

 guru : `02:39:04` Tonights demo will be about spirals and scrolls. Specifically laying them out and making jigs. guru : `02:40:40` I generally just bend scrolls by eye but many need to lay them out. The easy way is on a grid like this. guru : `02:42:08` This grid is a set of concentric circles 1/2" (13mm) apart and divided into right angles, 45's and 22.5's guru : `02:43:11` The scroll is laid out in equal steps. Starting at the center guru : `02:43:22` guru : `02:44:38` Here we have placed a point on each 90 and 45 degree line moving out one circle at a time. guru : `02:44:51` guru : `02:46:35` If you put a point on every dividing line as you move out the circles you get a faster more open spiral. guru : `02:47:06` guru : `02:48:25` But you can also skip more than one dividing line and get a slower tighter spiral. guru : `02:49:07` guru : `02:51:22` Here we have skipped 2 lines between each point. When we layout the scroll we can divide the "skipped" lines into thirds to make a smoother spiral. guru : `02:53:34` Using the same grid you can layout any kind of spiral to any scale. guru : `02:54:49` Once you have your spiral scrolls laid out you will want to make a jig if you need to make more than a few exactly alike. guru : `02:55:40` There are several methods of making scroll jigs or benders. guru : `02:55:52` guru : `02:57:32` This simple jig is made of 1/8" angle iron and 1/8" by 1" flat bar. It was used to make identical scrolls in 1/2" square stock. guru : `02:58:11` The image is out of shape due to the rectangular image being forged into a square. . . guru : `03:00:06` This jig was used to make two ends of an "S" scroll that were different sizes. One end was pulled around to a chalk mark roughly at the cross bar, the other was pulled all the way around. guru : `03:01:07` Using the same jig for both ends gives a pleasing sense of continuity. guru : `03:01:20` guru : `03:02:46` This jig is made from a forged "fish tail" scroll. The tapering stock forges more naturally into a scroll if you are working by eye. guru : `03:10:13` The fishtail also sticks up higher than the other parts so that you get the effect of a stepped or progressive jig that can make more than one turn. guru : `03:11:59` This jig is also welded to a piece of angle iron so that it can be clamped in a vise. Vise mountable tooling is one of the handiest things you can do in the blacksmith shop. guru : `03:12:24` guru : `03:13:15` This is a scroll bender attachment for a Hossfeld bender. guru : `03:13:27` guru : `03:14:28` It works by having a hinged portion that swings out of the way so that the bar to be bent can be inserted. guru : `03:15:52` As the stock wraps around the bender the hinged portion can swing in and a spiral of more than 360 degrees can be bent. guru : `03:17:27` Normally these production benders produce an ugly flat end on the stock. However, if you are forging a bean end or fishtail on your scroll you can make a bender like this that accepts that style end. guru : `03:18:34` guru : `03:19:12` Questions? flatthumb : `03:20:28` looks like the Golden Mean in a spider web - fascinating! Doug : `03:20:37` Is the stock bent while red hot when making a scroll on jigs like this? guru : `03:22:46` Doug, It can be bent hot or cold. Normally the tight center part is bent hot and then the rest cold. poorboy : `03:21:35` when bending by eye or your first scroll for the jig do you use a set of posts, a bending tool of some sort ? T-Boat : `03:21:56` the Golden Mean can be found all over nature, flat flatthumb : `03:22:40` Where did you pick this up Guru? It's a lot simpler than laying it out with rectangles.:) joe : `03:23:20` found this a while back, might be of interest..freebie.. GRAPH PAPER PRINTER can be downloaded from the author's website : http://perso.easynet.fr/~philimar/ guru : `03:23:52` FT, all true spirals are mathematically progressive. Those who try to fit everything into those rectangles are fanatics. poorboy : `03:24:17` you indicate one of the first jigs you showed us was 1/8" thick, how heavy of scroll material can be worked on an 1/8" jig? guru : `03:25:24` On that jig I bent 1/2" square. The first 4-6" were bent hot. The rest cold. guru : `03:26:10` Most of my scrolls get bent over the horn of the anvil or just curled up hot with a hammer. guru : `03:27:05` I only make jigs when they have to fit a specific space and you need more than 2 or 3. Chris : `03:28:13` Hi Guru - I downloaded a picture of that first jig, and don't quite see how it's used. Could you elaborate on some of the details? guru : `03:28:17` The Hossfeld type is expensive to make OR purchase. However, if you are going to make a couple thousand cold bent scrolls it pays off quickly. guru : `03:28:33` guru : `03:29:34` The "S" scrolls made with this one had to fit existing wooden brackets that made a triangle. guru : `03:30:17` After scrolling the S's were fit into a triangular for the final fit. guru : `03:30:45` This was part one of two. Bill Epps will be doing the second half, "Scroll Ends" in a few weeks. guru : `03:32:48` These and several other benders can be seen in our Benders article on the 21st Century page. guru : `03:34:25` If there are no more questions, I'll say good night folks!

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