SAGA designs and supplies high-performance lapping and polishing machines, precision tooling, and engineered components used in controlled surface finishing applications across optics, advanced materials, and high-tolerance manufacturing industries.

We work alongside experienced engineering partners to support complete lapping and polishing systems aligned with customer production goals.

Lapping and Polishing Tooling

Concave Spherical Polishing Lap (Stainless Steel, Cast Iron)

Convex spherical Polishing Lap (Phenolic, Stainless Steel, Cast Iron)

Functional Engineering Objectives

The primary engineering objectives of lapping and polishing systems include:

• Achievement of flatness and parallelism
• Control of surface roughness parameters (Ra, Rz, PV)
• Minimisation of subsurface damage
• Dimensional stability under thermal and mechanical loading
• Repeatability across production cycles

These objectives are achieved through controlled interaction between the plate surface, abrasive media, slurry chemistry, applied pressure, and kinematic motion.

Plate Material Selection Criteria

Plate materials are selected based on:

• Hardness relationship to workpiece material
• Chemical compatibility with slurry constituents
• Wear behaviour and conditioning response
• Thermal stability
• Risk of contamination transfer

These objectives are achieved through controlled interaction between the plate surface, abrasive media, slurry chemistry, applied pressure, and kinematic motion.

Cast Iron

Micro-graphitic cast iron enables controlled abrasive embedding and predictable wear behaviour.

Characteristics
• Moderate hardness with self-conditioning capability
• High dimensional stability
• Consistent material removal performance

Applications
• Engineering metals
• Carbides
• Technical ceramics where metallic contamination is not critical

Hardened Steel

Used for aggressive stock removal applications requiring high structural durability.

Engineering Limitation
• Reduced abrasive retention
• Higher micro-scratch risk

Aluminum

Used primarily as a substrate for compliant polishing pads.

Characteristics
• Low hardness
• High machinability
• Corrosion sensitivity

Stainless Steel

Selected when chemical resistance is required.

Trade-off
• Higher cost
• Lower abrasive embedding capability

Ceramic Plates

Used to eliminate metallic contamination risks.

Benefits
• Chemical inertness
• Stable surface chemistry
• No ferrous impregnation

Glass Plates

Used for ultra-delicate substrates.

Characteristics
• Minimal contamination risk
• High fragility
• Low hardness

Natural Metals (copper, Tin, Tin-Alloys)

Used mainly for fine diamond polishing.

Function
• Facilitate diamond particle retention
• Enable ultra-fine surface finishes

Composite Plate Materials

Engineered matrices designed to balance removal rate, surface finish, and wear stability.

Groove and Surface Conditioning Function

Groove geometrics govern:

• Slurry hydrodynamics
• Contact mechanics
• Swarf evacuation
• Local pressure distribution
• Thermal dissipation

Improper groove design leads to hydroplaning, glazing, non-uniform wear, and unstable removal behaviour.

Groove Pattern Classifications

Solid Plates

Provide maximum support area and uniform pressure distribution.

Limitation
Reduced slurry transport efficiency.

Radial Grooves

Provide balanced slurry transport and manufacturability.

Performance
Stable wear patterns
Predictable removal rates
High process repeatability

Cross-Grid (waffle) Grooves

Increase slurry retention and contact modulation.

Risk
Groove intersection breakdown may generate scratch defects.

Spiral Grooves

Optimise slurry transport and swarf evacuation.

Constraint
Higher stress concentration at part edges.

Concentric Grooves

Used in low-speed, high-lubricity processes.

Limitation
Limited compatibility with automated carrier systems.

Insert Carriers (Polishing Carriers)

Insert carriers are precision holding systems designed to support thin, brittle, or high-value substrates during lapping and polishing operations. They combine rigid metallic carrier frames with compliant insert materials to optimise contact mechanics, part stability, and edge protection.

Functional Role

Insert carriers:

• Reduce edge stress concentration
• Improve thickness uniformity
• Stabilise rotational kinematics
• Improve material removal repeatability
• Reduce wafer edge fracture and chipping

Mechanical Principle

The compliant insert layer distributes contact pressure while the steel frame maintains dimensional rigidity. This hybrid structure enables:

Controlled elastic deformation
Reduced shear stress at part edges
Improved centering stability

Construction

Typical construction includes:

• Precision-machined steel carrier frame
• Polymer or composite insert segments
• Bonded or mechanically retained interfaces
• Insert hardness is selected based on:
• Substrate brittleness
• Process pressure
• Abrasive aggressiveness
• Target surface finish

These objectives are achieved through controlled interaction between the plate surface, abrasive media, slurry chemistry, applied pressure, and kinematic motion.