I made this sloyd knife a few weeks ago to use for various carvings. I decided to document how I make these in some detail while making a new spoon knife.
Start with a decent piece of tool steel roughly 2mm to 3mm thick. This reciprocating saw blade should do fine. It must be a steel that can take a heat treatment.
Layout the general shape of the blade.
Profile the blade blank. Here, I used a grinder and hand files.
The complete blank.
Here's the forge that I use. Its just a brake drum from a pickup truck with a pipe attached underneath for airflow. There's also a piece of sheetmetal in the bottom with some holes drilled in to keep the charcoal from falling through. I attach the output of a shopvac for airflow.
Lighting the Forge.
Hammering the shape around a small pipe, held in a vise.
A video of the final heat treatment.