In this instructable, I'm going to explain the basics of scoring sheet metal (steel) to allow folds that are usually difficult on a finger brake.
It's usually nearly impossible to use a brake to fold lines to a point, so I'm using a pyramidal polyhedra to illustrate this concept.
Step 1: File Preparation: Vectors & Flow Path Software
The first step is creating a pattern to cut & score: I chose a nice heptagonal pyramid.
You're going to be working with vectors, and the FlowPath software does best with files of type ai v 10 or autocad 10 dxfs. It is a bit finicky about the files it will open so make sure to back-save to one of these formats, and keep your original on hand for edits.
I'm not going to go into much detail about the FlowPath software we use to prepare cutting paths, save for the necessary info which is: there's a 'scribe' function. If you're familiar with the software, you know that you select the vectors you want to cut and assign speeds to them based on the level of precision you're hoping to achieve.
Make a box around your shapes; you'll be creating two separate cut files, one score and one cut, and to make sure they line up you'll want to have something to snap to the corner of the cutting envelope.
Next to those colorful speed buttons in the lower lefthand corner, there's a grey button which means 'scribe'. The water jet will move over all the vectors you assign this speed to at a much faster rate; the precise rate will be determined when you set up your material properties at the water jet itself.
Here are some pyramids to play with; thanks to [Copyright © 1998-2008 Gijs Korthals Altes www.korthalsaltes.com]
These are also great for the laser cutter.