Driling is often carried out late in the manufacturing process, after previous operations have alreadyenhanced the initial component's value. The driling application, although seemingly simple, is acomplex operation that can have significant consequences if the tool malfunctions or is run beyond itscapacity. For this reason it is important to have a strategy on how to achieve your desired hole.

Drilling deep holes
- The process of driling deeper holes requires longer tools that are more sensitive to deflection

- Chips have a longer distance to evacuate
- When driling 6-7xD holes with CoroDrill DS20, a feed reduction at entry and exit is required. Entry feedshould be 75% of recommended feed rate, exit feed should be 0.05 mm/rev.

Important factors to consider:

- If drilling holes deeper than 6xD with CoroDrill 870 use a piloting operation

- Ensure that coolant flow is sufficient to evacuate chips

- Adiust vour cutting data to obtain satisfactory chins, a stable process and ultimately reaching thedemands of your hole

Achieving a stable process
- Achieving a stable process is the ultimate goal when selecting your drilling strategy

- To achieve this multiple factors come into play (coolant, fixturing, machine capacity, etc.)

- Apart from the previously mentioned, a factor that has a large impact is cutting data

Adjust cutting data to optimize your process either to:

- Increase penetration rates (by increasing feed)

- Prolong tool life (by reducing speed)

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