Printed from Kezuriba (kezuriba.net/en/troubles/flatness/)

Poor flatness or parallelism (face milling)

Turning and milling Milling

Check first

Workpiece deflects
Tool deflects
Thrust force is large

Try first

Reduce the feed and depth of cut
Use a sharp cutting edge, a cutter with a small corner angle, and fewer teeth
Increase tool and workpiece mounting rigidity

?Likely causes

Workpiece deflectsOne maker^[1][2]
Tool deflectsOne maker^[1][2]
Thrust force is largeOne maker^[1][2]

✓Fixes

Cutting conditions

Reduce the feed and depth of cutOne maker^[1][2]

Tool

Use a sharp cutting edge, a cutter with a small corner angle, and fewer teethOne maker^[1][2]

Setup

Increase tool and workpiece mounting rigidityOne maker^[1][2]

↔Related problems

Chatter (vibration)Rough, torn, or fuzzy finished surface Dimensions vary or are out of tolerance Built-up edge forms Chips stretch long or tangle Chips are too fine, scatter, or stick Chips clog or jam (milling, end milling)Burrs appear (turning, milling)

📚Sources

Causes and fixes are summarized in our own words from cutting-tool makers’ troubleshooting guides and technical data. “Agreed by 2+ makers” means two or more makers say the same thing.

Mitsubishi Materials — Face milling: Troubleshooting mmc-carbide.com
Mitsubishi Materials — Face milling troubleshooting mmc-carbide.com