The three most basic parameters for the hole are:

• Hole diameter
• Hole depth
• Hole quality

The hole type and required precision affect tool choice. Drilling can be affected by irregular or angled entry/exit surfaces and by cross holes.

When analyzing the hole, look at the workpiece material, component shape and quantity

• Does the material have good chip-breaking qualities? Long or short chipping material?
• Machinability?
• Material hardness?
• Alloy elements?

The machine influences:

• The type of operation
• Which type of tool holders and/or collets to use

Always consider:

• Machine stability
• Spindle speed
• Coolant volume and pressure
• Workpiece clamping
• Choice of horizontal or vertical spindle

Productivity is not only influenced by grade and geometry, but also by the ability to clamp the tool securely and precisely. For best stability and hole quality, always use Coromant Capto^® or CoroChuck™ 930 with the shortest possible drill and overhang.