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OSNA-Cu 58®:
Drilling/Cutting
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- The High Performance Rod HPR
HPR rods are excellent for magazine feeding into autolathes because of their tight diameter and length tolerances. The ends are finished to allow easy feeding. Round rods with a tolerance of ISO h9, and a closer straightness tolerance can be supplied to order.
Finishing of Rod Ends
- Cutting
The OSNA-Cu 58® alloys belong to cutting class 1 with a cutting index of approx. 70-80 (basis: machining brass = 100). The cutting properties of OSNA-Cu 58® S are marginally lower than OSNA-Cu 58® Te. For gun drilling (e.g. nozzle holes) and other very complicated cutting work OSNA-Cu 58® Te is usually recommended.
Cutting index of machining brass, OSNA-Cu 58® and copper
- Drilling
For drilling, drills made of high speed steel as also used for machining brass, have proved to be eminently suitable.
OSNA-Cu 58® can be drilled dry. However, a thorough coating with light cutting oil, as applied for turning, is advised in order to minimize cutting tool wear. Feed should be constant and ensure that chips are removed from the hole.
To calculate optimal drilling conditions for OSNA-Cu 58® with twist drills, use the following reference values:
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Angle of twist |
24 - 40° |
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Clearance angle |
12 - 15° |
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Point angle |
118° |
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Tool rake |
3 - 8° |
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Cutting speed |
50 - 100 m/min. |
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Feed |
0.03 - 0.5 mm/rotation |
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Cutting feed speeds depend in each case on drill diameter, thickness of workpiece and drill hole depth.
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