The file should cut on the forward stroke rather than the return stroke.

• A. Always cut on the return stroke
• B. Always cut on the forward stroke
• C. Cuts on both strokes
• D. Does not cut

Answer: (B)

The action of a file is that it bites and removes metal when you push it forward. The teeth are designed with a rake and shape that engage the workpiece during the forward stroke, shearing away material with each stroke. On the return stroke, the teeth simply glide over the surface and clear chips rather than actively cutting, so material removal is minimal. That’s why in normal filing practice you apply steady pressure as you push the file forward, and you lighten or lift the pressure on the way back to let the teeth ride over the surface and prevent gouging or clogging. Keeping the file flat and ensuring even forward pressure gives a true, smooth finish.