3. Drills
3.1 Tool selection
The first question to answer when choosing a tool is whether it should be an indexable or regrindable insert drill. As the first of these two types of drill cannot be used for small-diameter holes, the choice in such a case must necessarily be a resharpenable drill. In any case, it's a good idea to start by considering the diameter of the hole before choosing the appropriate tool.
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Small-diameter holes
Resharpenable drills with Delta geometry (Sandvik-Coromant nomenclature) are available in three versions, with partially overlapping diameter ranges (figure 27...
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Drills
Conclusion: tool selection
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