Applications and solutions for threading
|
Problem |
Cause |
Solution |
|
Thread cutting |
• Incorrect thread cutter • Incorrect tolerance • Thread cutter is not centered • Cutting speed is too high • Insufficient lubricating coolant delivery • Core hole bore is too small • Chipping blockage • Incorrect axial feed rate selected |
• Match the thread cutter to the correct material group • Check the tolerance of the thread cutter and, if applicable, use another tool • Check tool mount and position the center of the thread cutter over the hole • Reduce cutting speed • Ensure good lubricating coolant delivery • Ensure that the correct core hole bore is used (see core hole drill table) • Use the correct tool shape • Reduce feed rate to 5-10% and check the contact pressure of the thread cutter |
|
Thread is too narrow |
• Incorrect thread cutter • Incorrect tolerance • Core hole bore is too small • Thread is too narrow |
• Match the thread cutter to the correct material group • Check the tolerance of the thread cutter and, if applicable, use another tool • Ensure that the correct core hole bore is used (see core hole drill table) • Ensure that the correct tool shape is used |
|
Too much wear |
• Incorrect thread cutter • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition • Cutting speed is too high |
• Match the thread cutter to the correct material group and select the correct shape • Ensure good lubricating coolant delivery • Ensure correct lubricating coolant composition • Reduce cutting speed |
|
Tool chipping off |
• Incorrect thread cutter • Hardened surface • Core hole bore is too narrow • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition |
• Match the thread cutter to the correct material group and select the correct shape • Reduce speed, choose a coated tool, • Ensure good lubricating coolant composition • Ensure that the correct core hole bore is used (see core hole drill table) • Ensure good lubricating coolant delivery • Ensure correct lubricating coolant composition |
|
Thread surface is not clean |
• Chipping blockage • Cold welding on the thread cutter flank • Unsuitable tool shape • Cutting speed is too high • Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition |
• Ensure that the correct tool shape is used • Remove cold welding or use another tool • Ensure the correct thread cutter is used • Reduce cutting speed • Ensure good lubricating coolant delivery • Ensure correct lubricating coolant composition |
|
Thread cutter breakage |
• Chip blockage or jam • Tool shape unsuitable for the work • Too much wear on the thread cutter • Torque is too high • Thread core hole is too narrow |
• Adapt choice of thread cutter to the work being carried out • Ensure that the correct tool shape is used • Replace the thread cutter in good time • Use a thread cutter with overload coupling • Ensure that the correct core hole bo |
|
Thread cutter overheating |
• Insufficient lubricating coolant delivery • Incorrect lubricating coolant composition • Thread cutter is worn |
• Ensure good lubricating coolant delivery • Ensure correct lubricating coolant composition • Replace the thread cutter in good time |
|
Thread axially blended |
• Obtain left-rotating thread cutter for lower point pressure • Strong right-rotating thread cutters have point pressure that is too strong |
• Keep thread cutter in the same pressure range as the thread cutter chuck. Stronger axial contact pressure when beginning to cut • Only minimum contact pressure when beginning to cut |