Which block is used to support a workpiece under pressure during setup?

• A. V-block
• B. Packing block
• C. Dead block
• D. Wedge block

Answer: (B)

When setting up a workpiece, you want to spread the clamping force across a larger, flat surface to avoid marring or bending. A packing block is designed to sit between the clamp and the workpiece, filling gaps and distributing pressure evenly so the piece isn’t damaged and stays properly aligned.

A V-block is used to support round stock in a V-shaped groove, not to cushion or spread clamp pressure. A dead block provides solid support but doesn’t specifically distribute load during clamping. A wedge block is used to create wedge pressure for securing parts, but it isn’t the general-purpose solution for distributing clamping force during setup.