What is the Proper Hole Condition for In-die Tapping?
We are often asked what the condition of the punched hole should be when utilizing In-die tapping. In-die tapping does not require any special consideration in regard to punched hole condition. However, the quality of the hole will have an affect on the quality of the thread whether you are In-die tapping or secondary tapping.
For example, when punching thicker material, it is common to see a bell mouthed condition due to material break out. If this bell mouthed condition is not corrected it is likely that you will not receive a full thread through the entire thickness of the material. This non full thread condition will exist in both In-die tapping and secondary tapping operations. It is common practice to shave the punched holes in order to get a full wall thickness which in turn will lead to a complete full thread over the complete material thickness
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