What is the circuit that controls fast approach, followed by a decrease in speed called?

What is the circuit that controls fast approach, followed by a decrease in speed called?

• A. Rapid-traverse, slow feed
• B. Sequence
• C. Safety lock-out
• D. High-low

Answer: (A)

This question tests understanding of speed control in machine-tool circuits, specifically how a tool can move quickly to the near position and then slow down for precision. The circuit that implements this two-stage motion is the rapid-traverse, slow feed arrangement: the tool uses rapid traverse to approach the work quickly, then switches to slow feed when precise positioning or cutting is required. This approach minimizes overall cycle time while maintaining accuracy and surface finish. The other terms don't capture the intended two-speed behavior: a general sequence describes order of operations rather than a controlled speed change, safety lock-out relates to safety interlocks, and high-low is a broader label that doesn’t specifically denote rapid approach followed by slow finishing in this context.

This question tests understanding of speed control in machine-tool circuits, specifically how a tool can move quickly to the near position and then slow down for precision. The circuit that implements this two-stage motion is the rapid-traverse, slow feed arrangement: the tool uses rapid traverse to approach the work quickly, then switches to slow feed when precise positioning or cutting is required. This approach minimizes overall cycle time while maintaining accuracy and surface finish. The other terms don't capture the intended two-speed behavior: a general sequence describes order of operations rather than a controlled speed change, safety lock-out relates to safety interlocks, and high-low is a broader label that doesn’t specifically denote rapid approach followed by slow finishing in this context.