Quote:
Originally Posted by bvaks
thank u.yes u are right but i saw it in youtube some traditional tinsmith doing it.
i am doing the flange by bead roller .however it is difficult for me to keep the item (a cup) round thanks
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It's slightly elliptical when you roll it, because it is stretched out of material at a perpendicular angle. It will grow uneven especially around the double seam, so grow it from the center one way then double back to finish. If you're fitting a pipe inside the end of another pipe, like in a downspout drain, you add to the elliptical angle relative to the decrease in the top to bottom. Your pattern ends up like an arc shape.