Grooving Your Folds

At times you would like to have a fold in a specific place though it is impossible to fold it.
The solution is to groove it.
If you have access to a large flat bed plane, it makes it easy.
If you don't then you can do the following

Please wear your protective glasses when working with power tools

Example 1. Using a angle grinder with a thin cutting wheel, make a groove in your steel. You want to go about 2/3 of the thickness. Go slowly by doing many passes. The easiest way to know if you have grooved enough is by trying to bend it by hand. If it doesn't, do another pass until you can bend it up easy by hand. Example 1 can be used on material thicknesses up to 6mm thick.

Example 2. is similar to the above but the smooth edge of the fold is on the outside. The practical thickness is 2mm or less. Use a 3mm wide cutting disc in your angle grinder.

Example 3. is for materials up to 6mm thickness.
To get the perfect V is simply made by cutting a groove as per example 2 and then place a new grinding disk (not cutting disc) on the angle grinder and run it in the groove at 45 degrees.