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Choosing CNC Cutting Tools: PCD, Carbide, TCT and HSS Explained

Choosing between PCD vs carbide cutting tools, TCT and HSS depends on the material being machined, cutting geometry, production volume and required finish. Understanding the differences helps manufacturers select the most suitable CNC tooling for woodworking, composites, plastics and specialist machining applications.

At Prima Tooling, we manufacture and supply PCD, tungsten carbide tipped (TCT), solid carbide and HSS cutting tools, including bespoke tooling designed around individual machining requirements.

What Are CNC Cutting Tools?

CNC cutting tools remove material from a workpiece through programmed machining operations such as routing, milling, drilling, profiling and grooving.

The tool is held in the machine spindle or toolholder and follows a programmed cutting path to produce the required component.

Common CNC cutting tools include:

  • Router cutters for profiling, trimming, grooving and nesting.
  • End mills for milling, contouring and machining pockets.
  • Drills for producing accurate holes.
  • Profile cutters for manufacturing specific shapes or features.
  • Specialist cutters designed to combine several machining operations.

The correct tool depends on the workpiece material, machine capability, production volume and required finish.

Understanding Cutting Tool Materials

PCD – Polycrystalline Diamond Cutting Tools

PCD cutting tools use a layer of synthetic diamond particles bonded together under high pressure and temperature, typically supported by a tungsten carbide substrate.

PCD offers exceptional resistance to abrasive wear, making it particularly suitable for applications involving:

  • MDF, HDF and abrasive engineered wood products.
  • Laminated, melamine-faced and coated panels.
  • High-pressure laminate (HPL) and compact laminate.
  • Carbon-fibre and glass-fibre reinforced composites.
  • Selected engineering plastics and non-ferrous materials.

Although PCD tooling generally has a higher initial cost than conventional carbide tooling, its extended working life can make it more economical in continuous or high-volume production.

Reduced tool changes, consistent cutting performance and improved production efficiency can make a significant difference to overall machining costs.

PCD is not suitable for every application. Tool selection must take account of cutting conditions, material properties and the possibility of impact or interrupted cutting.

Solid Carbide Cutting Tools

Solid carbide provides an effective combination of hardness, wear resistance and rigidity.

It is commonly used for CNC router cutters, end mills and drills where accurate cutting edges and suitable cutting geometries are required.

Solid carbide tooling is widely used for:

  • Solid timber and wood-based panels.
  • Plastics and engineering polymers.
  • Composite materials.
  • Aluminium and other suitable non-ferrous metals.
  • General CNC milling and routing operations.

Different flute arrangements, helix angles and cutting-edge geometries can be selected to suit the material, chip evacuation requirements and desired surface finish.

Solid carbide is often an economical option for shorter production runs, smaller cutter diameters or applications where PCD does not offer a significant advantage.

TCT – Tungsten Carbide Tipped Cutting Tools

TCT cutters incorporate tungsten carbide cutting edges attached to a supporting tool body, commonly manufactured from steel.

This construction offers considerable flexibility when manufacturing larger-diameter cutters, specialist profiles and tools requiring particular body designs.

TCT cutting tools are commonly used for:

  • Woodworking and joinery.
  • MDF, chipboard and plywood.
  • Panel processing.
  • Rebating and grooving.
  • Profile machining.
  • Specialist industrial routing applications.

A major advantage of TCT tooling is that cutting edges can often be sharpened or replaced, depending on the tool design and condition.

HSS – High-Speed Steel Cutting Tools

High-speed steel remains useful in many machining applications, particularly where toughness and resistance to chipping are important.

HSS tooling is used for applications including drilling, milling, profiling and specialist cutting operations.

Compared with carbide and PCD, HSS generally has lower wear resistance when machining highly abrasive materials. However, it remains a practical choice for suitable materials and operating conditions.

Why Cutting Tool Geometry Matters

Selecting the correct cutting material is only part of achieving reliable machining performance.

Tool geometry has a major influence on cutting forces, heat generation, chip evacuation and component finish.

Important considerations include:

Number of flutes: The correct flute count depends on the material, feed rate, spindle speed and available space for chip evacuation. More flutes are not automatically better for harder materials.

Helix angle and cutting direction: Up-cut, down-cut and compression geometries influence chip removal and the quality of the upper and lower surfaces of a component.

Rake and clearance angles: These affect how the cutting edge engages the material, the cutting forces generated and the support behind the cutting edge.

Cutting diameter and length: The tool must provide sufficient reach while maintaining adequate rigidity and stability.

Feed rate and spindle speed: These must be appropriate for the tool, material and machining operation to avoid excessive heat, premature wear or poor cutting quality.

For example, when machining double-sided laminated panels, a correctly selected compression router cutter can help reduce chipping on both the upper and lower surfaces.

In composite machining, cutting-edge geometry and tool design are particularly important for controlling fibre damage, delamination and abrasive wear.

Cutting Tool Coatings

Certain carbide and HSS cutting tools can be supplied with surface coatings to improve wear resistance, reduce friction or provide greater resistance to heat.

Common coating types include:

  • Titanium Nitride (TiN).
  • Titanium Carbonitride (TiCN).
  • Aluminium Titanium Nitride (AlTiN).
  • Chromium Nitride (CrN).

However, not every coating is suitable for every workpiece material or machining operation.

The coating must be selected alongside the cutting tool substrate and geometry, considering the material being machined and the intended cutting conditions.

When Is Bespoke CNC Tooling Worth Considering?

Standard cutting tools are suitable for many applications, but they cannot always provide the required profile, dimensions, finish or production efficiency.

A bespoke cutting tool may offer advantages where:

  • A particular component profile is required.
  • Standard tool dimensions are unsuitable.
  • Several machining operations could be combined.
  • Tool wear is affecting production efficiency.
  • Surface finish or edge quality needs improvement.
  • Abrasive materials are causing frequent tool replacement.

Prima Tooling manufactures bespoke PCD, TCT and carbide cutting tools to suit individual requirements.

Tooling can be developed from technical drawings, CAD files, sample components or existing cutters.

Sharpening, Servicing and Retipping

The working life of a cutting tool does not necessarily end when its cutting edges become worn.

Depending on the design and condition of the tool, sharpening, servicing or retipping may restore cutting performance and extend its useful life.

Prima Tooling provides in-house servicing for PCD, TCT, carbide and HSS cutting tools, including tools originally manufactured by other suppliers.

Each tool is assessed to establish the appropriate servicing requirements and whether further work is practical.

Regular tool maintenance can help maintain component quality, reduce unnecessary replacement costs and support consistent production.

Choosing the Right CNC Cutting Tool for Your Application

There is no single cutting-tool material or geometry that offers the best performance in every application.

For high-volume machining of abrasive materials, PCD may provide considerable advantages in tool life and reduced downtime.

Solid carbide offers versatility and precision across numerous CNC applications, while TCT is particularly useful for many woodworking, panel-processing and bespoke profile applications.

HSS remains relevant where its toughness and cutting characteristics suit the operation.

Ultimately, the most effective solution comes from matching the cutting tool to the material, machine, production volume and required result.

Discuss Your CNC Tooling Requirements with Prima Tooling

With over 40 years’ experience in cutting-tool manufacturing, Prima Tooling supports manufacturers across woodworking, panel processing, composites, plastics and specialist engineering applications.

Whether you require a standard CNC cutter, bespoke PCD tooling or sharpening and servicing for existing tools, our team can help you explore the most appropriate solution.

Contact Prima Tooling to discuss your application or request a quotation.

Telephone: 01277 260340
Email: sales@primatooling.co.uk
Website: www.primatooling.co.uk