CoroDrill® 870
CoroDrill® 870 exchangeable-tip drill saves time, increases productivity, and reduces cost per hole. Tailored to suit your needs, CoroDrill® 870 is designed to optimize applications through diameter range, steps and length possibilities for the H9-H10 hole tolerance area.
Select drill tip
-PM 4334 - First choice for ISO P, N and titanium -MM 2334 - First choice for ISO M and Inconel -KM 3334 - First choice for ISO K -GP 4334 - Piloting drill tip for all ISO materials
Drilling strategy for deep holes
When drilling holes deeper than 6 × D, a pilot hole is needed for best hole quality.
Tool holding
For best possible tool performance in terms of productivity, tool life, hole quality and reliability, minimizing run-out is essential.
To minimize run-out, use CoroChuck™ 930 with a sealed collet.
Insert mounting
For quick and easy tool mounting, gently press the tip down and towards the support surfaces while tightening the screw to the recommended torque shown on the drill body.
Preferably use a torque screwdriver to ensure the tip is securely seated.
Application tips
Selecting your cutting data
There are many aspects to consider when optimizing your drilling process, and a good starting point can be valuable. Click on references below, for recommended speeds and feeds depending on your material:
Metric <6 × D
Metric >6 × D
Inch <6 × D
Inch >6 × D
Use CoroPlus® ToolGuide to obtain further tailored cutting data recommendations.
Achieving good hole quality
Achieving good hole quality may require some extra attention. Here, you can find some useful tips to get you started.
Advanced operations
Advanced operations, such as inclined or curved hole entries, crossing holes, and irregular surfaces, require extra attention before machining. We have collected useful information to make advanced holes easy.
Recommendations
Internal coolant
- Internal cutting fluid is recommended for safe chip evacuation
- Apply sufficient cutting fluid flow and follow the recommendation on emulsion concentration from your supplier
Coolant recommendations
- When drilling deep holes, sufficient coolant flow is crucial to enable proper chip evacuation
- Minimum recommended levels of cutting fluid flow are provided according to the adjacent figure
Always use the shortest drill bodies possible
- Keeping the drill body length to a minimum enhances rigidity and, in turn, stability and security in drilling applications
- For applications that require a long reach, CoroDrill® 870 has a Tailor Made option that allows drill bodies to be extended without a chip flute
Use of Tailor Made tips for best performance
- Sharp edges on the drill tip reduce feed force and the risk of built-up edges
- Corner radius provides a stronger corner and can enhance tool life in some applications. It also minimizes exit burrs
Learn more:
Ask your drilling specialist for more information concerning Tailor Made capabilities.
Highlights
Minimizing tool run-out in rotating applications
Sandvik Coromant tips video on how to reduce tool run-out in solid carbide and exchangeable tip drills.
Analyzing chip formation
Sandvik Coromant tips video on analyzing chip formation with symmetrical drills.
Apps
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