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PCD Multi-Diameter Combination Reamer

Overview

The PCD Combination Reamer for Multi-Diameter Finishing is engineered to perform precision reaming of stepped and multi-diameter bores in a single operation. Designed with polycrystalline diamond (PCD) cutting edges, it delivers superior wear resistance, extended tool life, and mirror-like surface finishes even in high-volume CNC production environments.

By consolidating multiple finishing processes into one tool, it reduces cycle times, improves process stability, and guarantees tight tolerances with excellent roundness and concentricity. Custom geometries are available to match customer-specific bore dimensions, steps, and tolerance requirements.

For a complete overview of PCD reamers, including piloted, brazed, form, multi-step, combination, and adjustable reaming tools, visit our main PCD Reamers guide.

PCD Reamers guide

Applications

  • Automotive components such as cylinder heads, blocks, and transmission housings

  • Aerospace structural parts with precision multi-diameter bores

  • Hydraulic and pneumatic housings requiring multi-step bore finishing

  • Non-ferrous machining including aluminum, copper, magnesium alloys, and composites

Key Features

  • Multi-diameter finishing tool – Combines two or more bore finishing steps in one pass

  • PCD cutting edges – Exceptional wear resistance and long service life

  • Tight tolerance capability – Bore accuracy achievable to IT6 or better

  • Superior surface quality – Produces Ra ≤ 0.2 µm finishes

  • Custom geometries – Stepped, tapered, or compound bore profiles available

  • Coolant-through design – Improves chip evacuation and heat control

Benefits

  • Shorter cycle times by eliminating multiple reaming tools

  • Reduced tool inventory with one combination reamer covering multiple steps

  • Higher productivity in high-volume machining environments

  • Consistent bore accuracy with excellent roundness and concentricity

  • Lower cost per part compared with carbide alternatives

Technical Specifications

ParameterSpecification
Tool typePCD Combination Reamer
Cutting materialPCD (Polycrystalline Diamond)
GeometryMulti-diameter / stepped / compound bore
Flute count2 – 6 (custom per application)
Diameter rangeØ3 – Ø30 mm (customizable)
Chamfer optionIntegrated chamfers available
Tolerance≤ IT6 achievable
Surface finishRa ≤ 0.2 µm
CoolantThrough-coolant optional

Options & Customization

  • Step count: 2, 3, or multi-step geometries

  • Bore profiles: straight, tapered, compound, or special

  • Shank options: cylindrical, HSK, BT, CAT, or modular

  • Edge prep and PCD grade selection for specific materials

  • Chamfering or countersinking integrated into design

Related Tools

Contact

For drawings, multi-diameter bore specifications, or a quotation, please contact:
[email protected]
Aoshiji® Custom Tool – Precision PCD and Custom CNC Tooling Solutions

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PCD REAMER:

PCD Reamer Basics

Full Form Reamers

Brazed PCD Reamers

Piloted PCD Reamers

Multi-Step PCD Reamers

Adjustable PCD Reamers

Combination PCD Reamers

SOLID CARBIDE REAMERS :

REAMERS

STEP REAMERS

BRAZED CARBIDE REAMERS :

For Hydraulic Control Valve Body

Aoshiji® Custom Tool – PCD combination reamer for multi-diameter finishing operations.

PCD Reamer Basics

2-flute PCD step reamer for multi-step bore finishing in aluminium, combining multiple diameters in one pass

Definition, functions, and selection boundaries for PCD reamers in bore finishing. Start here before choosing brazed, step, form, piloted, adjustable, or combination PCD reamer concepts.

Piloted PCD Reamers

Piloted PCD reamer with pilot guide for alignment-critical bore finishing and coaxiality control

Piloted PCD reamers add a guiding pilot to improve alignment in coaxiality-critical bores. They are often used when maintaining bore-to-bore relationship, straightness, or alignment is as important as final size and finish.

Brazed PCD Reamers

4-flute reamer with an integrated chamfer for finishing the bore and entry chamfer in one pass

Brazed PCD reamers are a mainstream production solution where PCD cutting segments/tips are brazed onto a tool body. This concept is widely used for straight-shank, step, and form reamers because it balances performance with practical tool manufacture and cost control.

Full Form Reamers

BT taper shank PCD form reamer for profile-related bore finishing, combining wear resistance and repeatable form accuracy

PCD form reamers are tailored to bores with defined profile features where form accuracy must be repeated over long runs. The geometry is application-specific and is typically driven by the bore profile, allowance, and required surface integrity.

Multi-Step PCD Reamers

Three-step profiled PCD step reamer for stepped bore finishing with formed transitions in one pass

Multi-step PCD reamers finish multiple diameters (and often chamfers) in a single pass, reducing tool changes and improving positional consistency between features. They are commonly selected in high-volume production where cycle time and repeatability are critical.

Combination PCD Reamers

2-flute helical combination PCD reamer integrating PCD OD machining, internal step turning, and ID chamfering for one-pass bore finishing

Combination tools integrate reaming with additional operations to reduce tool changes and improve process efficiency. The exact concept depends on the part features and the process plan, and is typically developed as a dedicated production tool.

Adjustable PCD Reamers

fine-adjustable PCD reamer with diameter adjustment unit for micro-adjustable final sizing

Adjustable PCD reamers are used when fine diameter compensation is required—typically on larger bores—so size can be corrected without replacing the full tool. This concept supports predictable tool management in long production runs.

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