Application indications and solutions for drilling
|
Problem |
Cause |
Solution |
|
Borehole is too large |
• Feed rate is too high • Chipping blockage • Run-out defect on the drill used • Grinds incorrectly |
• Reduce feed rate • Use the correct tool • Reduce run-out defect as much as possible • Check grinding is correct |
|
Burr at borehole exit |
• Cutting speed is too fast • Wear limit width exceeded |
• Reduce feed rate • Replace or re-sharpen tools in good time |
|
Breakage of the cutting edge |
• Unstable working conditions • Incorrect core hole drill • Unstable workpiece clamping • Wear limit width exceeded • Feed rate is too high • Flute clearance angle too great |
• Clear spindle clearance • Use the correct core hole drill • Check workpiece clamping • Replace or re-sharpen tools in good time • Reduce feed rate • Carry out better re-sharpening |
|
Fissure in the core |
• Impact on the chisel edge • Drill tip too sharp • Feed rate is too high • Flute clearance angle too great |
• Correct cutting speed • Re-sharpen correctly • Reduce feed rate • Re-sharpen correctly |
|
Chisel edge wear |
• Cutting speed is too low • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition • Feed rate is too high |
• Correct cutting speed • Ensure good lubricating coolant delivery • Ensure good lubricating coolant composition • Reduce feed rate |
|
Built-up edge development |
• Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition • Cutting speed is too low • Uncoated tool |
• Ensure good lubricating coolant delivery • Ensure good lubricating coolant composition • Increase cutting speed • Use a coated tool |
|
Poor borehole surface quality |
• Feed rate is too low • Inaccurate positioning |
• Increase feed rate • Centre borehole in advance |
|
Vibrations |
• Cutting speed is too high • Feed rate is too low • Unstable workpiece clamping • Run-out error of the core hole drill is too great |
• Reduce cutting speed • Increase feed rate • Ensure stable workpiece clamping • Reduce run-out error |
|
Flank wear |
• Cutting speed is too high • Feed rate is too low • Clearance angle too small |
• Reduce cutting speed • Increase feed rate • Increase clearance angle |
|
Corner wear |
• Excessive speed |
• Reduce speed to the optimum • Possible increase in feed rate |
|
Margin wear |
• Cutting speed is too high • Run-out error of the core hole drill is too great • Tool tapering is insufficient • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition |
• Reduce cutting speed • Reduce run-out error • Use tools that are more tapered • Ensure good lubricating coolant delivery • Ensure good lubricating coolant composition |
|
Fluting edge breakage |
• Poor chip removal • Drill bit is not stable in the chuck |
• Remove earlier • Ensure that the drill bit is in the chuc |
|
Stand length is insufficient |
• Incorrect cutting specifications • Unstable workpiece clamping • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition |
• Ensure cutting specifications are correct • Ensure stable workpiece clamping • Ensure good lubricating coolant delivery • Ensure good lubricating coolant composition |
Here, you can find a few general tips for using the tools. Every day, we are asked different questions about problems in using them. To make your life a little easier, we have compiled potential problems, causes and solutions for the appropriate tool area.
There’s always an answer or reason for why a drill, thread cutter, milling cutter or reamer does not work as required. The key is to know exactly where to go to resolve the problem.
We have summarized a few general examples of problems, their causes and their solutions to enable you to recognize your issue and the cause immediately, and the steps needed to choose the correct solution.