Any knives used on the farm are inevitably dull. Including knives for a meat grinder. Accordingly, the moment comes when they have to be sharpened. It may seem to many that restoring the sharpness of the knives of a meat grinder is something else. However, there is one affordable and proven sharpening method that will allow you to achieve factory sharpness in a matter of minutes and without applying a lot of effort.
What you need: mirror or glass, sandpaper P320
First of all, to sharpen the knives of a meat grinder, you will need sandpaper with a grit index of P320. If you take it even smaller, then the knives will no longer be brought to the factory, but to razor sharpness. However, this is hardly necessary for most owners. Next, we need a representative flat piece of glass or a mirror.
Next, you need to put the mirror on the table, and lay the selected sandpaper with the grain up on it. The point is that the sandpaper should be located on a perfectly flat surface. During the upcoming sharpening process, it is strongly recommended that you take extra care not to injure yourself from the potentially sharp edges of the glass or mirror.
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Lay the knife flat on the sandpaper and firmly press it down with your finger in the middle. We begin to make circular movements with rotation. The direction of the actions performed does not play any role. The operation should be continued until all parts of the blades become shiny. Proceed in the same way with the grinder grate.
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A source: https://novate.ru/blogs/151020/56395/