How do you sharpen a Phillips screwdriver?

Answer 1

I will assume by "sharpen" you mean "clean up", so it will grip screws firmly again. Use a small three-cornered file. Stroke in one direction only, and strive to keep the file straight and level. It helps to clamp the screwdriver diagonally in a vise, and work accordingly. DO NOT bring the tip to a "point" - the bottom of a Phillips screw head is rounded. Best way to avoid chewing up the tip of a Phillips screwdriver is to use the correct size Phillips for the screw at hand. There are four common sizes of Phillips screw: 0, 1, 2, and 3 (rarely used). But you need one of each. There are smaller sizes too, but those are jeweler's screwdrivers.

In that same type of screwdriver there are also the Pozidrive and Drywall bit - both slightly different angled shapes. Many people mistakenly use a Phillips #2 on drywall screws and don't get full torque on them.