To produce an axial groove in a component, it is important to choose correct tool holder for the insert. The tool holder must be adapted to the bending radius of the groove and should therefore be curved.
Choice of tools
The illustration above shows the CoroCut, the CoroTurn and the Q-Cut insert geometries in relation to recommended face grooving diameters.
First choice is the CoroCut 2-edged solution. Use -TF geometry for low feed,
-GM geometry for medium feed and -RM geometry for radial bottom face grooving.
The -TF and -GM geometries have positive geometries that eliminate the risk of built-up edges. The -TF geometry has good chip control and surface finish due to the Wiper design.
The -RM geometry has outstanding chip control and good surface finish.
Second choice is Q-Cut 151.3 in -7G geometry for medium feed. The insert generates low cutting forces with little vibration.
The table above shows CoroCut, CoroTurn and Q-Cut insert geometries and grades in relation to recommended
Medium diameters – 24 to 500 mm
For medium diameters, use the Q-Cut 151.3 with -7G or -7P geometry. First choice is the -7G geometry with Wiper design for surface finish. Both geometries offer good chip control.
Small diameters – 6.2 to 30 mm
For small diameters, use the CoroTurn XS or the CoroCut MB system. Both inserts have sharp cutting edges for good results at low feeds.
CoroTurn XS is intended for precision machining in diameters from 6.2 to 18 mm.
Tool holder recommendation
70˚ angeled holder
Use CoroCut solid tool holders especially designed for face grooving. Type RF/LF (0° insert angle) or RG/LG (90° insert angle) cover the first cut from 34 to 400 mm diameter and offer the best stability.
For grooving depths up to 4.5 mm, an angled shank holder is available. The holder is available in 7°, 45° and 70°, rightand left-hand style versions.
CoroTurn SL face grooving blades can also be used together with Coromant Capto® and shank tool adaptors, making it possible to build several different combinations.
R= right-hand holder
Choose the correct tool (A or B sweep, right- or left-hand style) depending on your machine set-up and workpiece rotation. See illustration.
Insert geometry recommendation
How to apply
When roughing, the first cut (1) always starts on the largest diameter and works inwards. The first cut offers chip control but less chip breaking.
Cuts two (2) and three (3) should be 0.5-0.8 x width of the insert. Chip breaking will now be acceptable and the feed can be increased slightly.
When finishing, machine the first cut (1) within the given diameter range.
Cut two (2) finishes the diameter. Always start outside and turn inwards.
Finally, cut three (3) finishes the inner diameter to the correct dimensions.
Correct tool for diameter range
Make sure that the correct tool is chosen for the diameter range.
1. If the insert support rubs the inside diameter of the workpiece, the diameter range could be wrong or the tool may not be parallel to axis.
2. If the insert support rubs the outside diameter of the workpiece, the diameter range could be wrong or the tool may not be parallel to axis.