What are the pieces called that raise a job off the table for machining purposes?

• A. Shims
• B. Parallels
• C. V-blocks
• D. Risers

Answer: (B)

Parallels are the precise blocks placed on the machine table to lift a workpiece so it sits at the right height and remains parallel to the table and the cutting tools. They come in matched pairs and are machined so their top faces are level with each other, which lets you set the workpiece on top and clamp it without tilting. Stacking them or choosing the right thickness lets you raise the piece to the exact height you need while keeping the top surface parallel to the vise jaws or the table surface, which is crucial for accurate machining. Other items have different roles—shims fill gaps, V-blocks support round stock, and risers change the height of a vise or fixture—but when you want to lift a job evenly off the table for secure, true clamping, parallels are the correct choice.