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CoroTurn® PI
Secure and efficient internal turning
- Combines roughing and finishing in a single tool, saving cycle time on tool changes
- Increases productivity with the PrimeTurning™ methodology
- High-precision chip breaker provides consistent quality, enabling automation
- Eight cutting edges increase cost-efficiency
Operation(s)
External turning, Internal turningWorkpiece material(s)
Tight spaces — your comfort zone
Vibration, build-up and tight tolerances are challenges internal turning operators know all too well.
CoroTurn® PI brings security and precision where demands are high and space is limited, applying our PrimeTurning™ methodology with small entering angles and multi-directional turning, now paired with a precisely engineered chip breaker.
With stability and control, it turns tight spaces into comfort zones.
Innovative tool design
From roughing to finishing in a single set-up
CoroTurn® PI features two dedicated insert seats, one for roughing and one for finishing, allowing you to complete both operations in a single set-up.
- Reduces tool changes
- Shortens cycle time
- Maximizes uptime
PrimeTurning™ method
This patented multi-directional turning method uses a low entering angle to enable higher feed rates and boost productivity.
Chip-breaking technology
Unlike conventional inserts, the chip breakers on CoroTurn® PI are narrower and positioned closer to the cutting edge, providing exceptional chip control and process reliability when applying the PrimeTurning™ methodology.
Versatile coolant configuration
CoroTurn® PI offers multiple coolant configurations to match different component shapes, ensuring precise coolant delivery for improved chip evacuation and uninterrupted machining.
Eight edges that cut costs
CoroTurn® PI is purposefully engineered to bring more value with every tool. With eight cutting edges on each roughing insert and excellent durability, you get longer cutting time from every insert and set-up.
CoroPlus® Tool Path
Fast, accurate programming
CoroTurn® PI can be programmed directly in CoroPlus® Tool Path, a software designed to handle a variety of component types and complex contours, including:
- Blind holes
- Through holes with or without profile
- Profiles with chamfer and radii, undercuts and reliefs, and multiple steps
The advantage? CoroPlus® Tool Path automatically considers both inserts throughout the process, including precise corner clean-up for the finishing insert.
Get started with a free trial period.
Product range
G-type inserts
- Operation: Medium and roughing
- Workpiece materials: ISO P, ISO M and ISO K
- IC sizes: 8 and 11 mm (0.315 and 0.433 inch)
- Corner radius: 0.8 mm (0.031 inch)
- Double-sided
- Cutting edges: 8
- Insert geometry: L5W
- Features a wiper design
A-type inserts
- Operation: Finishing and profiling
- Workpiece materials: ISO P, ISO M and ISO K
- IC sizes: 6–7 mm (0.236–0.276 inch)
- Corner radius: 0.8 mm (0.031 inch)
- Single-sided
- Cutting edges: 3
- Insert geometry: F5
Cutter body
- Diameter range: 20–50 mm (0.787–1.968 inch)
- Maximum depth of cut: 2.5 × DC
- Cutter body interface: Coromant Capto® and cylindrical shank without clamping feature
- Internal coolant
- Holds both roughing and finishing inserts
Assortment
Start by selecting one or more products
Start by selecting one or more products
How to use
Inserts
Geometries
Medium to roughing
The G-type insert is a double-sided pre-machining insert with eight cutting edges. It features a wiper design on all edges for excellent surface quality and high-feed capabilities.
Finishing to profiling
The A-type insert is an asymmetrical, single-sided insert with three cutting edges for corner clean-up and finishing. It’s optimized for high chip control in both forward and backward turning, even at high feeds.
Grades
GC4415
CVD-coated carbide grade for roughing to finishing. Made for applications with continuous cut to light intermittence in stable conditions — when more heat resistance is needed.
GC4425
CVD-coated carbide grade for roughing to finishing of steel and steel castings. Can handle continuous cuts as well as interrupted cuts at high metal removal rates. For a broad application area.
GC2220
CVD-coated gradient sintered carbide grade for roughing to semi-finishing, where higher wear resistance is needed.
GC1205
PVD-coated carbide grade with good adhesion and flank wear resistance. The combination of hard substrate and coating allows significant increases in cutting speed.
Tool set-up
Offset values
Setting up the tool differs slightly from most turning tools, as the bar holds two inserts. Each insert can be assigned a separate offset value under the same tool number.
For best results, mount the bar with the finishing insert on the top side (positive X direction). This makes it easier to compensate for dimensional adjustments.
| Tool holder | XD mm (in) | ZD mm (in) | ZG mm (in) | ZD+ZC mm (in) |
| C6-PI-32-BG11A07-110 | 37 (1.46) | 1.05 (0.041) | 7 (0.276) | 8.05 (0.317) |
| C6-PI-40-BG11A0-140 | 45 (1.77) | 1.05 (0.041) | 7 (0.276) | 8.05 (0.317) |
| PI-A16M-BG08A06-R | 19.5 (0.768) | 0.85 (0.033) | 4.75 (0.187) | 5.6 (0.220) |
| PI-A20Q-BG08A06-R | 24 (0.945) | 0.85 (0.033) | 4.75 (0.187) | 5.6 (0.220) |
| PI-A25R-BG11A07-R | 29.5 (1.16) | 1.05 (0.041) | 7 (0.276) | 8.5 (0.317) |
| PI-A12Q-BG2.5 A1.8-R | 23.05 (0.907) | 0.85 (0.033) | 4.75 (0.187) | 5.6 (0.220) |
| PI-A16R-BG3 A2-R | 29.88 (1.18) | 1.05 (0.041) | 7 (0.276) | 8.05 (0.317) |
Mounting the tool
All cylindrical bars have an EasyFix™ groove for the correct setup of center height. We also recommended using a suitable EasyFix™ sleeve.
The cylindrical bars can be adjusted for a suitable overhang, but too long an overhang can lead to vibrations. The Coromant Capto® bars all have a fixed 2.5 × DC overhang.
Mount the tool with the finishing insert positioned in the positive X-axis direction of the machine’s movement. This setup ensures proper functionality within CoroPlus® Tool Path and allows the machine operator to use conventional tool compensation for the finishing insert.
Tool handling in CNC controller
The machine must be programmed with two separate compensation values. The exact procedure depends on the controller brand. Most importantly, both compensations must be assigned to the same turret position — the same position number must be used.
CAM programming
The tool can be programmed in all types of CAM software due to the simple toolpaths, but there are no fixed strategies in their systems yet. Everything needs to be programmed as a single movement.
When programming blind holes, be sure to define the roughing insert path correctly. An incorrect profile length can cause collision with the finishing insert.
If the roughing insert contour is shortened by 0.5–1 mm, the finishing insert will avoid collision with the bottom profile.
Coolant set-up
CoroTurn® PI tools offer various configurations depending on the shape of the component. The coolant option distinguishes between components with blind holes and those with through holes.
The tailored coolant configuration helps to achieve the best possible chip evacuation.
In blind holes, all coolant channels need to be open.
In through-hole components, axial
coolant holes should be sealed to prevent water from flowing through them.
Remove stop screws to open coolant flow in the front. Optionally, remove all four screws for maximum forward cooling. In this case, very little will flow to the sides
Limits
To ensure optimal performance, we recommend using the tool at a diameter-to-length ratio of 2.5 × DC. Operations at 3 × DC is possible, but cutting data must be adjusted to avoid excessive pressure and vibration.
A laser-marked line on the tool indicates the 2.5 × DC depth.
Feed rate recommendations
Different feeds/D.O.C with PI-A0608L-F5
Different capability with different overhang PI-G0808D-L5
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Sandvik Coromant UK
+44 (0)121 368 0305