Which filing technique is used for finishing and smoothing metal and plastic at 90 degrees to the workpiece?

• A. Cross filing
• B. Draw filing
• C. Stopped halving joint
• D. Welding

Answer: (B)

Finishing and smoothing surfaces requires a technique that gives a very even, fine surface. Draw filing achieves this by keeping the file flat on the workpiece and pulling it along the length with long, steady strokes and light pressure. The teeth cut the surface gradually, producing uniform lines that make the surface smooth and true, which helps when the surface needs to be flat and square to the edges. It’s slower than other methods, but it gives the highest quality finish. Cross filing, in contrast, moves the file across the surface and removes material more quickly but leaves coarser, crosshatched marks, so it’s less suited for a fine finish.