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CoroDrill® 400 and 430

The hole

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.

The component

When the hole is analyzed, have a 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

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

Tool holding

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.

Tool run-out

Minimum tool run-out is essential for successful drilling. The run-out should not exceed 0.02 mm in order to achieve:

  • Close hole tolerance and straightness
  • Good surface finish
  • Long and consistent tool life

Coolant

Coolant supply influences:

  • Chip evacuation
  • Hole quality
  • Tool life

Internal coolant is necessary for hole depths larger than 3 × DC and to avoid chip jamming.

External coolant can be used for shallow hole depths and good chip formation.

Chip control

Chip formation and evacuation is a critical issue. Chip jamming is dependent on:

  • Workpiece material
  • Choice of drill geometry
  • Coolant pressure/volume
  • Cutting data

It affects hole quality, drill life/reliability, drill breakages.

Cutting data

Cutting speed is the main factor affecting tool life.

High speed rates:
  • High temperatures
  • Increased tool wear
  • Poor hole quality
  • Bad hole tolerance
Lower speed rates:
  • Built-up edges
  • Bad chip evacuation
  • Longer time in cut

Application tips

Recommendations

  • It is recommended to use hydraulic precision chucks
  • It is recommended to use internal coolant; minimum recommended pressure of 10 bar (145 psi)

CoroChuck™ 930 for highest clamping force and precision

CoroChuck™ 930 pencil type for improved accessibility



Geometry selection



CoroDrill® 400 is recommended when drilling into solid material. It features more flute volume for better chip evacuation.



CoroDrill® 430 is recommended for drilling into cored material or pre-cast holes. It features three flutes for increased stability.

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