Laser Cutting High Speed Steel
As previously detailed, the rifling cutters which were made from a broken Brobo blade were unsuitable because I had not taken into account the thinning of the blade due to hollow grinding.
So I bought some high speed steel in the form of woodworking thicknesser blades, which were 3mm thick. Also, I redesigned the cutters to be a bit more robust, and take a 4mm pin instead of the previous 3mm pin, which looked a bit spindly.
Interesting, John. Does the laser cutting affect the tool steel, or you need to harden it afterwards anyway? I guess it will need a bit of grinding to clean it up after laser cutting
Hi Stuart, the tool steel seemed unaffected by the laser cutting. I had 6 cutters made, not knowing how they would perform, but required only one to make 6 rifling grooves, with 2 edge touchups with a diamond file. John.