CoroDrill® 861
CoroDrill® 861 provides the high stability essential for drilling deep holes, with high speed and efficiency, up to 30 × D.
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.
Coolant
Coolant supply influences: Internal coolant is necessary for hole depths larger than 3 × DC and for avoiding chip jamming.
The machine
The machine influences: Always consider:
Tool run-out
Significant contributor to effective hole making.
Application tips
CoroDrill® 861-GM
—For longer tool life, avoid highest speeds
—Avoid low feed rates
—Reduce feed by a factor of x0.1 to break into exit cross hole and for angled faces
—Speeds and feeds, and methods, are to be used as a starting point. Final setup will be application dependent
- Important to apply a machining strategy
CoroDrill® 861-GP
- Recommended to use on drill lengths above 12 × D
Learn more about reconditioning your older tools
Recondition your round tool up to 3 times for major cost savings with our reconditioning service.
Recommendations
Piloting strategy
The range of drills for deep holes has a complementary range of high performance pilot drills.
The pilot drills are designed to work with the deep hole drills to give maximum accuracy in drill location and minimum hole run-out. Due to the body tolerance being p7, applying a pilot drill strategy will also extend the tool life of the deep hole drill.
Machining strategy
For maximum performance and productivity, Sandvik Coromant recommend applying a machining strategy when using CoroDrill® 861-GM.
Tool holding
Sandvik Coromant always strongly recommends CoroChuck® 930 for maximum precision and reliability.
Customized solutions
To complement the standard assortment, Sandvik Coromant offer a Customized Solutions program for the exact dimension or length needed to complete your application. Advanced Engineered support is available upon request.
Product range
| Length/diameter ratio |
Diameter, mm (inch) |
Coolant | Geometry | Shank style | Grade |
| 12 | 3−20 (0.118−0.787) |
Internal | -GM | DIN 6535 HA | GC34 |
| 15 | 3−12 (0.118−0.472) |
Internal | -GM | DIN 6435 HA | GC34 |
| 20 | 3−12 (0.118−0.472) |
Internal | -GM | DIN 6535 HA | GC34 |
| 30 | 3−8 (0.118−0.315) |
Internal | -GM | DIN 6535 HA | GC34 |
| Pilot drill | 3−12 (0.118−0.472) |
Internal | -GP | DIN 6535 HA | GC34 |
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