Here are some tips for machining internal threads:
1. Choose the right tool: According to the specification of the thread, material and processing requirements, choose the right tap or thread milling cutter.
2. Correct bottom hole size: Ensure that the diameter of the bottom hole meets the standard for threading, too large or too small will affect the quality of the thread.
3. Tool mounting and alignment: Ensure that the tool is securely mounted and perpendicular to the machine axis in order to obtain an accurate thread shape.
4. Suitable cutting parameters: These include cutting speed, feed and depth of cut, to be optimized according to material and tool characteristics.
5. Adequate cooling lubrication: Use effective cooling lubricants to reduce cutting heat, extend tool life and improve thread surface quality.
6. Staged machining: For larger or deeper internal threads, step-by-step tapping or milling can be used to reduce tool loads.
7. Quality of pre-drilled holes: the surface roughness of the bottom holes should be low and the walls of the holes should be smooth and burr-free.
8. Regularly check tool wear: Replace badly worn tools in a timely manner to ensure threading accuracy.
9. Machining sequence planning: Reasonable arrangement of work processes to avoid the influence of other machining processes on the threaded parts.
10. Trial machining and measurement: Before batch machining, carry out trial machining and use suitable gauges to test the thread size and accuracy, and adjust the parameters in time.
