What limit does the override key setting rapid traverse to 25% impose?

What limit does the override key setting rapid traverse to 25% impose?

• A. Limiting movement speed to 50%
• B. Decrease feed rate by 10%
• C. Limiting movement speed to 25% of maximum
• D. Restores spindle speed to 100%

Answer: (C)

The override key is a control feature on CNC machines that allows operators to adjust the operational speeds of different functions, including rapid traverse and feed rates. When the override key is set to 25%, it specifically restricts the maximum speed of the rapid traverse function to 25% of its standard or maximum speed settings. This means that during operations such as moving the tool or workpiece to different positions rapidly, the machine will only operate at a quarter of its full capability for those movements. This is particularly useful in situations where precision is critical or where the operator needs to ensure safe movement in proximity to other machinery or workpieces. In contrast, the other options present misconceptions about what the override key affects. It does not limit the movement speed to 50% or decrease feed rates, neither does it have any impact on spindle speed when set to 25%. Instead, it guarantees that the machine's rapid movements will only occur at a reduced speed for heightened control and safety.

The override key is a control feature on CNC machines that allows operators to adjust the operational speeds of different functions, including rapid traverse and feed rates. When the override key is set to 25%, it specifically restricts the maximum speed of the rapid traverse function to 25% of its standard or maximum speed settings.

This means that during operations such as moving the tool or workpiece to different positions rapidly, the machine will only operate at a quarter of its full capability for those movements. This is particularly useful in situations where precision is critical or where the operator needs to ensure safe movement in proximity to other machinery or workpieces.

In contrast, the other options present misconceptions about what the override key affects. It does not limit the movement speed to 50% or decrease feed rates, neither does it have any impact on spindle speed when set to 25%. Instead, it guarantees that the machine's rapid movements will only occur at a reduced speed for heightened control and safety.