can anybody tell how to form a spiral chute from 3mm mild steel?

Answer 1

You will probably have to get hold of a sheet metal textbook that will explain how to develop the shape you need onto a flat plate. Or a sheet metal worker, if there is such a thing these days. As someone else says, you will have to make a series of segments and then weld them together. There are computer programs that do this, but they are complex. Set out your measurements on a cardboard template, then transfer the shape to the steel.

Answer 2

Assuming you want vertical cylinder with a spiral chute inside that form, you have to cut a series of circles (donuts for a center post) with a radius cuts to center and bend them up to form one segment of the chute and weld them end to end. If you are going to be really neat about it, you need to cut pieces of metal that are somewhat more than a half circle when flat so the joins occur exactly every half turn. (If you start with full circle, the joins will not be in line.)
Make a paper model to see angles of joins.
Here - search for ramp or air ramp, it is a huge page.
http://billpentz.com/woodworking/cyclone/BuildCyclone.cfm

Answer 3

in geometric terms that could also be described as a helical curve ask about geometry hope that is of some help

Answer 4

Hi,
I think you need to explain a little bit more?
Be Safe, Skew.