What angle in degrees should be set between axes on lathes and milling machines?

What angle in degrees should be set between axes on lathes and milling machines?

• A. 10 degrees
• B. 5 degrees
• C. 20 degrees
• D. 15 degrees

Answer: (D)

The angle between the main axes should be set to about 15 degrees. This small tilt provides enough clearance for tool shanks, fixtures, and parts as the machine moves between axes, while still keeping the setup rigid enough for accurate cutting. If the angle is too small, you risk rubbing, binding, or chatter on approach. If it’s too large, you lose rigidity and can introduce deflection and inaccuracy. Fifteen degrees is a commonly recommended compromise that works with typical tooling and setups. Always consult the specific machine’s manual for the exact recommended value.

The angle between the main axes should be set to about 15 degrees. This small tilt provides enough clearance for tool shanks, fixtures, and parts as the machine moves between axes, while still keeping the setup rigid enough for accurate cutting. If the angle is too small, you risk rubbing, binding, or chatter on approach. If it’s too large, you lose rigidity and can introduce deflection and inaccuracy. Fifteen degrees is a commonly recommended compromise that works with typical tooling and setups. Always consult the specific machine’s manual for the exact recommended value.