how do i make an open ended cone from a flat sheet.?

Question

I need to make a cone out of steel sheet. how do i mark it out so it has the right size holes at each end?

Answer 1

You didn't say how long tall or what ever you want it, make the cone then trim it to size if its for ice cream then keep it closed at the small end. LOL

Answer 2

The top and bottom holes will each be an ARC (circular curve) of two CONCENTRIC (both centres are the same point) circles.

The distance between the two curves (at centres or either end) will be the height of the cone.

The LENGTH of each arc will be Pi x the diameter of the hole (Pi is 3.141), plus whatever overlap or seam allowance you need for attaching the edges together.

The angle of the sides of the cone will determine how far away the centre of the circles is. (if it is close to the sheet, the angle will be shallow, so the holes will be very different sizes. If you want more vertical sides (a more cylindrical cone, more similar holes), you need to move the centre further away.

Build a paper model (one tenth size is good), so you can experiment. Use string instead of workshop-sized compasses.

Answer 3

Get a piece of paper, or tape newspaper together, to create a paper version of your steel sheet. (If the paper is too thin and lacks enough body to make the shape effectively, I would double or triple-up the sheets to make them firmer -- or use poster board or something similar). Then, I would roll up the paper to the conical shape you seek... mark the paper. Then, lay the paper down over the steel sheet and mark the steel from the paper "pattern". Well, that's what I would do. Good luck.

Answer 4

Either
1. Cut the sheet to the correct shape
2. Accept some overlap.

Answer 5

Cut the paper into a circle, make a slit from one edge into the centre of the circle and fold round

Answer 6

Instructions & diagrams on site below (scroll down page)

Answer 7

Look at this site...