Groove Turning Operations

The information in this section will help you create and edit Groove Turning operations in your manufacturing program.

The Groove Turning operation allows you to machine a groove by a series of plunging cuts. You can specify:

The following topics are dealt with in the paragraphs below:

Tooling for Groove Turning

The following tooling may be used:

Note that the following attributes may influence machining (they are located on the Insert-holder's Technology tab):

These attributes take tooling accessibility into account and may reduce the machined area.
However, you can use the Insert-Holder Constraints option on the operation editor to either ignore or apply these tooling attributes. You can replay the operation to verify the influence of these attributes on the generated tool path.


Geometry for Groove Turning

Part and Stock profiles are required. They can be specified as follows:

Orientation for Groove Turning

The following Orientations are proposed: internal, external, frontal and inclined. The selected Orientation defines the type of geometric relimitation to be done between the stock and part geometry in order to determine the area to machine. For an inclined orientation you must specify the Angle of Incline.

Part and Stock Offsets for Groove Turning

Offsets can be positive or negative with any absolute value. The global offset applied to the part profile is the resulting value of the normal, axial and radial offsets.

Machining Strategy Parameters for Groove Turning

Path Definition for Groove Turning

Lead-in, Lift-off and Attack for Groove Turning

These options allow penetration into the workpiece at a reduced feedrate in order to prevent tool damage. Once the attack distance has been run through, the tool moves at machining feedrate.

When tool motion between two passes is in contact with the part profile, in order to avoid collisions the corresponding feed is the lift-off feedrate and not RAPID.

Feeds and Speeds for Groove Turning

Speed unit can be set to:

then you can give a Machining Speed value.

The following feedrates can be set to either Angular units (length per revolution) or Linear units (length per minute):

Feedrates in units per minute are also available for air cutting such as macro motions and path transitions.
Note that RAPID feedrate can be replaced by Air Cutting feedrate in tool trajectories (except in macros) by selecting the checkbox in the Feed and Speeds tab page .

Dwell setting indicates whether the tool dwell at the end of a path or a plunge is to be set in seconds or a number of spindle revolutions.

Please note that decimal values can be used for the number of revolutions. For example, when machining big parts that have a large volume, it can be useful to specify a dwell using a value of less than one revolution (0.25, for example).

Tool Compensation for Groove Turning

You can select a tool compensation number corresponding to the desired tool output point. Note that the usable compensation numbers are defined on the tool assembly linked to the machining operation. If you do not select a tool compensation number, the output point corresponding to type P9 will be used by default.

Note that the change of output point is managed automatically if you set the Change Output Point option.
If the output point is consistent with the flank of the groove to be machined, the output point is changed when the other flank of the groove is machined.
At the end of the operation, the output point is the same as it was at the start of the operation. See Changing the Output Point for more information.

Approach, Retract and Linking Macros for Groove Turning

The following Approach and Retract macro modes are proposed: Direct, Axial-radial, Radial-axial, and Build by user.
The selected macro type (Approach or Retract) defines the tool motion before or after machining.

Various feedrates are available for the approach and retract motions (RAPID, lead-in, lift-off, and so on). Local feedrates can be set to either Angular units (length per revolution) or Linear units (length per minute).

See Define Macros on a Turning Operation for more information.

Linking Macros

Linking macros, which comprise retract and approach motion can also be used on Groove Turning operations.
Approach and retract motions of linking macros are interruptible. For Groove Turning only, you can interrupt the macro at the end of the number of specified levels. See Interruptible Macros for more information.

It can be useful to interrupt an operation when the foreseeable lifetime of the insert is not long enough to complete the machining.

Behavior of Linking Macro when Grooving by Level

Groove turning can be done in one or more levels using the Grooving by Level mode. Also, you can define Linking macros and define interrupt modes of these macros.

Prior to Release 18, if the Linking macro is interrupted at the end of a level, the macro returns to the previous tool path and not to the next cutting motion.

As from Release 18, the macro returns to the next cutting position in the toolpath after retract from interruption at the end of a level.

A Linking macro returning to previous tool position and then moving to the next cutting position is considered a redundant move. As from Release 18, such redundant moves are avoided.