The Complete Online Guide to Knifemaking, SURFACE GRINDING
After drilling the pin holes and before starting to grind the blades bevels, it’s good practice to surface grind the blank. The main purpose is to confirm the material is flat. If you do not have a stand- alone surface grinder or surface grinding attachment for your belt grinder, knifemakers can simply use a handled shop magnet to hold the blank and then grind each side on the flat platen of a belt grinder. This is usually done with the blade facing point down with an 80-grit belt. The surface grinding will be done again prior to heat treating and yet again after heat treating but with a finer grit belt.