Technical Guidance Cutting Edge FailureOthers Technical Guidance Tool Failure and Remedies Trouble Shooting Guide for Endmilling Failure Cause Remedies Excessive Wear Cutting Conditions - Cutting speed is too fast - Decrease cutting speed and feed rate. - Feed rate is too fast Tool Shape - The flank relief angle ist too small - Change to an appropriate flank relief angle. Tool Material - Insufficient wear resistance - Select a substrate with more wear resistance - Use a coated tool Chipping Cutting Conditions - Feed rate ist too fast - Decrease cutting speed. - Cutting depth is too deep - Reduce depth of cut - Tool overhang ist too long - Adjust tool overhang for correct length Machine - Work clamps are weak - Clamp the work piece firmly Area - Tool is not firmly attached - Make sure the tool is seated in the chuck properly Tool Fracture Cutting Conditions - Feed rate ist too fast - Decrease cutting speed. - Cutting depth is too deep - Reduce depth of cut - Tool overhang ist too long - Reduce tool overhang as much as possible - Cutting edge is too long - Select a tool with a shorter cutting edge Shoulder Deflection Cutting Conditions - Feed rate is too fast - Decrease cutting speed. - Cutting depth is too deep - Reduce depth of cut - Tool overhang is too long - Adjust tool overhang for correct length - Cutting on the down-cut - Change directions to up-cut Tool Shape - Helix angle is large - Use a tool with a smaller helix angle Unsatisfactory Cutting Machined Surface Conditions - Feed rate is too fast - Decrease cutting speed. Finish - Packing of chips - Use air blow - Use an insert with a larger relief pocket. Chattering Cutting Conditions - Cutting speed is too fast - Decrease cutting speed. - Cutting on the up-cut - Change directions to down-cut - Tool overhang is too long - Adjust tool overhang for correct length Tool Shape - Rake angle is large - Use a tool with an appropriate rake angle Machine Area - Work clamps are weak - Clamp the work piece firmly - Tool is not firmly attached - Make sure the tool is seated in the chuck properly Packing of Chip Cutting Conditions - Feed rate is too fast - Decrease cutting speed. - Cutting depth is too deep - Reduce depth of cut Tool Shape - Too many teeth - Reduce number of teeth - Packing of chips - Use air blow N12