What should be done with parallels after clamping the workpiece in the vise?

• A. Leave them in place
• B. Remove them after clamping
• C. Tighten them firmly
• D. Use new parallels every time

Answer: (B)

Parallels are precision spacers used to raise and align the workpiece in the vise so the stock sits at the right height and is square to the jaws. After you’ve tightened the vise to hold the piece, remove the parallels. This keeps the vise jaws clean and ready for the next setup, prevents damage to the parallels from clamping pressure, and avoids interference with future clamping or different piece heights. Store and inspect the parallels after use to maintain their accuracy.