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Drilling tools
Troubleshooting drilling tools
Problems and their causes
1 Cutting edge built-up 4 Crumbling on cutting lips
• cutting speed too low • non rigid conditions,
• excessive honing of cutting lip insufficient workpiece clamping
• when bright finish cutting lips have tool coated • when interrupted cut reduce feed
• max. wear and tear values have been exceeded
• wrong tool type; apply suitable tool (see appli-
cation recommendations page 20)
2 Crumbling of outer corner 5 Land wear
• non rigid conditions, • non rigid conditions,
insufficient workpiece clamping insufficient workpiece clamping
• deviation from concentricity too large • deviation from concentricity too large
• when interrupted cut reduce feed • back taper too small
• wrong coolant (oil), soluble oil too thin
3 Heavy wear and tear at flank 6 Scoring on tool body
• cutting speed too high • non rigid conditions,
• feed too low insufficient workpiece clamping
• clearance angle too small • deviation from concentricity too large
• when interrupted cut reduce feed
• for abrasive materials thicken soluble oil
if necessary
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