Sheet metal pattern development tools for cones, segmental bends, set on pipes. Plus flange/ tube tables, various calculators and more. This could be the most useful tool in your toolbox. As a fabricator of 45+ years, the last 30 or so as the workshop manager, I have constantly used trigonometry etc. to calculate cones, segmental bends and much more. Nowadays I am constantly asked by the fabricators to calculate developed lengths etc. to save them the time and effort of laying it out. I hav