Abrasion-Rapid Tool Wear-Solution
Make sure Speeds & Feeds are correct for application
Make sure coolant mix ratio is correct

Cratering-Edge Pitting-Solution
Bolster hold down-make sure its rigid
Make sure coolant mix ratio is correct
Decrease speed
Reduce load per tooth

BUE-Built Up Edge-Solution
Make sure coolant mix ratio is correct
Resharpen cutting edges
Increase chip load per tooth
Increase speed
Increase clearance angle

Chip Welding-Solution
Reduce Speeds & Feeds
Make sure coolant mix ratio is correct

Chip Packing-Solution
Use tool with less flutes
Increase coolant flow

Poor Finish-Solution
Sharpen tool
Replace tool
Reduce load per tooth
Use tool with more teeth
Check tool holder and/or play in spindle

Inaccurate Machining-Solution
Sharpen tool
Replace tool
Check table alignment
Check ball screws, spindle bearings, and other moving parts

Scalloping-Solution
Tool may be out of round
Replace tool
Reduce feed rate
Make sure holder and spindle are true
Bolster hold down-make sure its rigid

Inaccurate Slot Position-Solution
Use roughing and finishing operation
Reduce feed rate

Sloping Slot Sides-Solution
Change from helical to straight flute tool
Use roughing and finishing operation

Chatter-Solution
Increase feed per tooth
Bolster hold down-make sure its rigid
Tool should be held with minimum stick out
Increase chip load per tooth
Make sure holder and spindle are true

Rubbing-Solution
Sharpen tool
Replace tool
Use larger diameter tool if possible
Reduce feed rate

Spindle Stall-Solution
Recalculate horsepower requirements
Reduce area of work-tool contact
Reduce load per tooth
Increase rake or clearance angle on tool
If conventional milling, try climb milling