Why are some chains worth sharpening, while others are not worth it, how are chains with different tooth profiles sharpened? The technique of sharpening the chains on the machine and the subsequent prophylaxis - how not to screw up the chain and dont break ... And as a result, universal errors when sharpening in different workshops and how to avoid them. This video is about cutting the sharpening of saw chains for the week in which I tried to talk about various problems in sharpening.