When it comes to extending the life of your shear blades, use the CLEveland approach.
Proper clearance between the upper and lower blades is crucial. A helpful tool to measure shear blade clearance is a "feeler gauge." Refer to your machine's manual for a correct clearance.
Lubricate the blade with Punch-Easy along the cutting edge as you would a punch. For blades that touch, such as a section bar (or round/square bar) set, make sure to grease the blades where they touch together.
Occasionally check the cutting edges of your shear blades. If they show wear or chipping, they should be flipped or rotated. (if applicable)
What tips do you find to be helpful in your shop? Comment if you know any!