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There are many parameters to consider when selecting a turning insert. Carefully select the insert geometry, insert grade, insert shape (tip angle), insert size, tip radius and lead angle (lead angle) to achieve good chip control and machining performance.

The blade shape should be selected based on the accessibility of the cutting edge angle required by the tool. The largest possible nose angle should be selected to provide blade strength and reliability. However, this must be balanced with the variation in the cuts that need to be performed.

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The larger the insert size, the better the stability. For heavy-duty machining, insert sizes above IC 25 mm (1 inch) are usually used.

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Insert geometry and insert grade complement each other. For example, the toughness of the grade can compensate for the lack of strength in the insert geometry.

Turning geometries can be divided into three basic types, optimized for finishing, semi-finishing and roughing. This diagram shows the working area of each geometry, based on acceptable chip breaking, in relation to feed and depth of cut.

It is preferred that axial forces be greater than radial forces. High radial forces negatively affect the cutting action, resulting in vibration and poor surface finish.

-WMX: Always preferred in a wide range of chip applications. Provides maximum productivity, versatility and best results.

The lead angle KAPR (or lead angle, PISR) is the angle between the cutting edge and the feed direction. Selecting the correct lead angle/lead angle is very important for a successful turning operation. The lead angle/lead angle affects:

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The relationship between nose radius and depth of cut affects vibration tendency. As depth of cut increases, the radial forces pushing the insert away from the cutting surface become more axial.

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Select the insert size based on the application requirements and the space available for the cutting tool in the application.

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Use wiper inserts to improve surface finish with standard cutting data or to maintain surface finish at significantly increased feed rates.

Nose radius RE is a critical factor in turning operations. Inserts are available in a variety of nose radius sizes. The selection depends on depth of cut and feed, and affects surface finish, chip breaking and insert strength.

Negative blades have an angle of 90° (0° clearance angle), while positive blades have an angle less than 90° (e.g. 7° clearance angle). The illustration of a negative blade shows how the blade is assembled and angled in the holder. Listed below are some characteristics of the two blade types:

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-WMX wiper geometry is preferred and a good starting point for most applications. When conditions change, there is always an effective alternative.

Small nose angles are weaker and have less cutting edge engagement, both of which make them more sensitive to the effects of heat.

Determine the necessary cutting length LE, taking into account the toolholder’s entering angle, cutting depth a p and machine specifications