Technical Information
Negative and Positive Insert Comparison
Negative insert ● Double/single sided ● High strength edge ● Zero clearance angle
Positive insert ● Single sided ● Low cutting forces ● With clearance angle ● 1st choice for boring and turning on slender parts
● First choice for external turning ● For heavy cutting conditions
Effects of Approach Angle
Approach angle Kr is the angle between cutting edge and feed direction. It's an important angle in turning that will affect:
● Chip formation ● Cutting force direction ● Cutting edge length
Large Approach Angle
Small Approach Angle
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● Cutting forces along with axis, less tendency for vibration. ● Can turn against the shoulder ● Higher cutting forces at the entrance and exit of cut ● It is easy to get notching wear in heat resistant alloy and hard materials
● Reduced the load on the cutting edge. ● Produced a thinner chip, higher feed rate can be used ● Reduced notch wear ● Cannot turn against a shoulder. ● Forces are directed to both axial and radial-vibration tendencies.
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