A man sharpens a knife on a machine while indoors.
A man is using a sander to sharpen the edges on a knife.
A man with a black shirt operates a knife sharpening machine without gloves.
A man is sharpening a knife on a belt sander.
a man using a very large machine with a belt to sharpen the blade of a knife
A man is carefully sharpening a knife blade on a belt.
A man is using a large tool to sharpen a knife.
A man runs the blade of a knife on a large machine.
A man stands at a machine and uses it to sand a knife.
A man showing the proper way to sharpen the edge of a knife.