 Sorry I had to upload the picture to this server. If you want a larger picture, click on the link. Cone LayOut By T_Bone This is a 1/4 patteren layout of any cone size. The true length of the cone is determined by line EB Apex E is determined by the angle line of AB Arc AC and BD is made from the Apex point E S.O. AC is pi x small cone diameter starting a point A locating point C S.O. BD is pi x large cone diameter starting at point B locating point D S.O. = stretch out or line length Draw a line from CD as this is the pattern cut line. Line AB is the second pattern cut line. The Pattern is from AB to CD. Work up the cone using a round anvil by hand or using slip rolls. To use a round anvil for cone work up, choose a anvil 1/3 smaller diameter than the small end diameter of the cone. While holding the small cone diameter, gently form the larger cone diameter around the anvil being careful not to make a crease in the metal by trying to work too much metal too fast. You will need to go over the patteren several times before you get a perfect cone shape. Once the cone is ruff shaped then you will to fasten the seam. You do however want to work the cone until it looks very smooth before joining the seam. After the cone seamed is joined, use a wooded mallet while holding the cone tight to the round anvil to tweak the final shape of the cone round. To use slip rolls to form the cone, first make a cone jig for the top roll. This cone jig is nothing more than a piece of pipe larger than the slip roll diameter with a pin that can roll 90� the the larger diameter. To use the roll cone jig, slip the jig over the top roll and close the rolls. Adjust the rolls so they taper about the same angle as the cone taper. Hold the small end of the cone against the jig roll pin then begin to roll. The small cone end will pivot around the roll jig. You will need to roll the patteren several times to get a smooth formed cone. Remove the cone from the rolls and hand tweak the cone until it looks well formed, then join the cone seam, then hand work the cone on the round anvil to finish. Cone layout as shown above will give you a perfect flat top and bottom diameter without triming. T_Bone
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