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CoroDrill 860

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 0.02mm 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 x DC and for avoiding 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

Correct tool selection

For help on selecting the right tool.

Initial considerations

Cutting speed, along with material hardness, are the main factors affecting tool life and power consumption.

How to achieve good hole quality

Achieving good hole quality may require some extra attention. Here you can find some useful tips to get you started.

Reconditioning

Recondition your round tool up to 3 times for major cost savings with our reconditioning service.

Recommendations

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

CoroChuck™ 930 For highest clamping force and precision

CoroChuck™ 930 pencil type For improved accessibility



Product range

Geometry Drill type Length/Diameter ratio Drill diameter
mm (inch)
Coolant Shank type Grade
-GM Standard single diameter drill (3‒8) 3-16
(0.118‒0.63)
Internal/external Cylindrical DIN 6535 HA X1BM
-GM Standard two diameter drill (3) 3-14
(0.118‒0.55)
Internal/external Cylindrical DIN 6535 HA X1BM
-SM Standard single diameter drill (2-5) 3-16
(0.118‒0.63)
Internal MQLHA 1210
-PM Standard single diameter drill (2–3) 3−20
(0.118−0.787)
Internal/external Cylindrical DIN 6535 HA GC4234
(4–5) 3−20
(0.118−0.787)
Internal/external Cylindrical DIN 6535 HA GC4234
(7–8) 3−16
(0.118−0.630)
Internal Cylindrical DIN 6535 HA GC4234
-PM Step and chamfer drill (3) 3.35−17.50
(0.132−0.689)
Internal Cylindrical DIN 6535 HA GC4234
-NM Standard single diameter drill (3, 8) 3−20
(0.118−0.787)
Internal Cylindrical DIN 6535 HA H10F
-MM Standard single diameter drill (2–3) 3−16
(0.118−0.630)
Internal Cylindrical DIN 6535 HA GC2214
(4–5) 3−16
(0.118−0.630)
Internal Cylindrical DIN 6535 HA GC2214
(7–8) 3−16
(0.118−0.630)
Internal Cylindrical DIN 6535 HA GC2214
-MM Step and chamfer drill (2–3) 3.35–17.5
(0.132-0.689)
Internal Cylindrical DIN 6535 HA GC2214

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