CNMM Series

Q: What is the main advantage of CNMM heavy-duty inserts?

CNMM inserts feature a reinforced 80° negative geometry with a negative chamfer (reinforced land). This design provides maximum edge strength and processing safety for extreme heavy-duty roughing, forged parts with black scale, and severe interrupted cuts where standard inserts would micro-chip.

Q: Which Amony grade is best for forged parts with scale?

For forged parts with black scale and heavy interrupted cuts, the PA4435 grade is highly recommended. It features a high-toughness substrate and CVD coating designed for extreme processing safety and high wear resistance.

Q: How many cutting edges do CNMM inserts have?

CNMM inserts feature 4 usable cutting edges. While fewer than the 8 edges of CNMG, the reinforced edge geometry is specifically engineered to withstand massive impact loads and deep cuts, making it the only viable choice for extreme roughing operations.

The ultimate solution for extreme heavy-duty roughing, forged parts with black scale, and severe interrupted cuts. CNMM's reinforced 80° negative geometry with a negative chamfer delivers maximum edge strength and processing safety under massive impact loads.

80° Reinforced Geometry Extreme Heavy-Duty Forged Scale & Interrupted High Toughness (PA4435) 4 Cutting Edges

View Specifications Request Bulk Pricing

Procurement & Commercial Terms

MOQ	10 pcs (Sample/Stock) \| 100 pcs (OEM/Bulk)
Lead Time	Same day dispatch (standard stock) \| 15–20 days (custom/OEM)
Inventory	CNMM190612-AG to CNMM250932-AG (-AG) heavy-duty range in stock. Ready to ship.
Material & Coating	Substrate: High-Toughness Carbide \| Coating: Medium-Temp CVD (PA4435, PA4225)
Packaging	Individual plastic boxes (10 pcs) \| Rigid export cartons
Shipping	DHL/FedEx/UPS for samples \| Air/Sea freight for bulk. Incoterms: EXW, FOB, CIF, DDP

CNMM Dimensions & Heavy-Duty Chip Breakers

80° reinforced negative geometry (0° clearance angle with negative chamfer). 4 usable cutting edges engineered for maximum impact resistance. Select your insert and inquire for pricing.

Model	IC (mm)	S (mm)	d (mm)	r (mm)	Available Chip Breakers	Action
CNMM190612-AG	19.05	6.35	7.94	1.2	AG	Inquire
CNMM190616-AG	19.05	6.35	7.94	1.6	AG	Inquire
CNMM190624-AG	19.05	6.35	7.94	2.4	AG	Inquire
CNMM250724-AG	25.4	7.94	10.32	2.4	AG	Inquire
CNMM250924-AG	25.4	9.52	10.32	2.4	AG	Inquire
CNMM250932-AG	25.4	9.52	10.32	3.2	AG	Inquire

Machining Strategy: CNMM's reinforced edge is mandatory for extreme roughing and heavy forge scale. For general to semi-heavy continuous turning, switch to our CNMG 80° Series to benefit from 8 cutting edges.

Heavy-Duty Chip Breaker Selection Guide

Optimized geometries for extreme roughing, forged scale, and severe interrupted cuts.

-AG Heavy-Duty (Single Side)

Single-sided chipbreaker with negative chamfer. Delivers high edge strength and maximum metal removal rate under large cutting depth and feed parameters. The preferred choice for light-load to extreme heavy-duty roughing and interrupted cuts.

Why Choose Amony CNMM for Extreme Roughing?

Solving critical pain points for B2B manufacturers requiring maximum process safety in the most demanding turning operations.

Maximum Edge Strength (Reinforced Land)

Standard inserts micro-chip instantly on forged scale or heavy keyways. CNMM's negative chamfer absorbs extreme impact forces, ensuring process safety and eliminating unpredictable tool failure.

Result: Uninterrupted machining cycles on forged and cast components.

High-Toughness PA4435 Grade

Our PA4435 CVD grade is specifically engineered for steel heavy-duty and interrupted turning. It combines a high-toughness substrate with a wear-resistant coating for extreme processing safety.

Result: Extended tool life in severe intermittent cutting conditions.

High Metal Removal Rate (MRR)

The -AG chip breaker is designed for large cutting depths and high feed parameters. It ensures stable chip breaking even under the most aggressive roughing strategies.

Result: Drastically reduced cycle times for heavy stock removal.

Factory Direct & OEM Support

As an ISO 9001 certified manufacturer, we provide direct pricing, stable lead times, and OEM support (laser marking, private packaging). Our engineers offer free CAM parameter optimization.

Result: Optimized supply chain costs and dedicated technical partnership.

Extreme Roughing & Interrupted Cut Applications

Where Amony CNMM inserts deliver unbeatable process safety and tool life.

Forged Parts with Black Scale (ISO P)

Machining forged components with hard, abrasive black scale. The reinforced -AG edge and PA4435 grade prevent catastrophic chipping and ensure predictable tool life.

Recommended: CNMM190612-AG / PA4435

Benefit: High toughness substrate withstands abrasive scale and impact forces.

Severe Interrupted Turning

Heavy keyways, square shafts, and splined components. Continuous impact loading shatters standard edges. CNMM's reinforced land absorbs the shock of entry and exit cuts.

Recommended: CNMM250724-AG / PA4435

Benefit: Eliminates edge breakdown in unstable cutting conditions.

Heavy-Duty Cast Iron Roughing (ISO K)

Rough machining of large cast iron housings and rolls. The -AG chip breaker handles thick chips efficiently while the CVD coating resists abrasive wear.

Recommended: CNMM190616-AG / PA4225

Benefit: Excellent cost-performance for general intermittent turning of steel and cast iron.

Large Roller & Shaft Profiling

Deep cuts and high feeds are required to remove large volumes of material quickly. CNMM's robust geometry ensures stability under extreme radial and axial loads.

Recommended: CNMM250932-AG / PA4435

Benefit: Maximum metal removal rate with excellent wear resistance.

Recommended Cutting Parameters (ap & f)

Optimize your feeds and depths for extreme heavy-duty roughing. All data strictly verified from factory testing.

Chip Breaker	Operation	Depth of Cut (ap mm)	Feed Rate (f mm/rev)	Target Material
-AG (Heavy-Duty)	Extreme Roughing	2.00 - 15.00	0.40 - 1.20	Steel (P) / Forged Parts
-AG (Heavy-Duty)	Severe Interrupted	1.50 - 10.00	0.30 - 0.80	Steel (P) / Cast Iron (K)

Note: For lighter roughing applications (ap < 2.0mm), consider using CNMG with the -AG chip breaker to reduce cutting forces and improve surface finish.

Best Practices for Heavy-Duty Turning

Machine Rigidity & Overhang

CNMM generates massive cutting forces. Ensure your CNC lathe has sufficient power and rigidity. Keep the tool holder overhang as short as possible to prevent vibration.

Coolant Strategy for Forged Scale

When machining forged parts with scale, dry machining or minimal coolant is often preferred to prevent thermal shock (cracking) on the CVD coating when exiting the scale.

Tool Holder Selection

Use robust clamping systems like PCLNR or PCBNN. The top-clamp or pin-lock mechanism must provide immense clamping force to prevent shifting under heavy impact.

Constant Engagement Strategy

For interrupted cuts, use CNC programming techniques (like variable depth of cut or lead-in arcs) to maintain constant tool engagement, reducing the shock of sudden entry.

Frequently Asked Questions

CNMM inserts feature a reinforced 80° negative geometry with a negative chamfer (reinforced land). This design provides maximum edge strength and processing safety for extreme heavy-duty roughing, forged parts with black scale, and severe interrupted cuts where standard inserts would micro-chip.

For forged parts with black scale and heavy interrupted cuts, the PA4435 grade is highly recommended. It features a high-toughness substrate and CVD coating designed for extreme processing safety and high wear resistance.

CNMM inserts feature 4 usable cutting edges. While fewer than the 8 edges of CNMG, the reinforced edge geometry is specifically engineered to withstand massive impact loads and deep cuts, making it the only viable choice for extreme roughing operations.

Request Quote for CNMM Series

Specify your diameter range, material, and monthly volume. We respond with pricing, stock status within 24 hours.

ISO 9001 Certified Factory

Export Packaging Standard

Technical Support Available

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