Stylus Tip (Sphere): Hardness 1500-2000 HV (ruby)

Component Specifications

Definition

A spherical stylus tip is a critical component of measurement probes used in coordinate measuring machines (CMMs) and other precision metrology systems. It serves as the contact point that physically touches the workpiece surface during dimensional inspection. The spherical geometry provides consistent contact geometry regardless of approach angle, allowing for accurate measurement of complex surfaces, contours, and features. These tips are manufactured to extremely tight tolerances to ensure measurement accuracy and repeatability.

Working Principle

The spherical stylus tip operates on the principle of tactile contact measurement. When the CMM probe approaches a workpiece, the spherical tip makes physical contact with the surface. The machine records the precise coordinates of the contact point, using the known radius of the sphere to calculate the actual surface position. The spherical shape ensures that the contact point is always at a consistent distance from the probe center, regardless of the approach angle, enabling accurate measurement of complex geometries.

Materials

Typically manufactured from synthetic ruby (aluminum oxide), tungsten carbide, silicon nitride, or industrial diamond. Ruby is most common due to its excellent wear resistance, hardness (9 on Mohs scale), and chemical inertness. High-precision applications may use diamond tips for superior wear characteristics.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	0.3mm to 8mm (common range)
Hardness	1500-2000 HV (ruby)
Sphericity	≤0.1μm to 0.5μm
Surface Finish	Ra ≤0.01μm
Mounting Thread	M2, M3, M4 standard
Temperature Stability	Coefficient of thermal expansion: 6.5×10⁻⁶/K (ruby)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10360, ISO 14253, DIN 32876, ASME B89.4.1

Parent Products

This component is used in the following industrial products

Measurement Probe (Stylus)

A precision contact sensor used on Coordinate Measuring Machines (CMMs) to physically touch and collect dimensional data from manufactured parts.

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Engineering Analysis

Risks & Mitigation

Tip wear leading to measurement drift
Contamination affecting contact accuracy
Impact damage from collisions
Thermal expansion errors
Improper mounting causing runout

FMEA Triads

Trigger: Abrasive contact with workpiece surfaces
Failure: Gradual wear changes tip diameter and sphericity
Mitigation: Use appropriate tip material (ruby/diamond), implement regular calibration, establish replacement schedules based on usage

Trigger: Probe collision with workpiece or fixture
Failure: Tip deformation or catastrophic damage
Mitigation: Implement collision detection systems, proper probe path programming, operator training, use of breakaway mechanisms

Trigger: Contamination buildup on tip surface
Failure: Inaccurate contact point measurement
Mitigation: Regular cleaning protocols, controlled environment, use of protective covers when not in use

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter tolerance: ±0.5μm to ±2μm, Sphericity: ≤0.1μm to 0.5μm depending on grade

Test Method

Laser interferometry for diameter and sphericity, roundness testing machines, optical comparator inspection, coordinate measuring machine verification

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Stylus Tip (Sphere)

Manufacturer profiles associated with Stylus Tip (Sphere).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

Why are ruby balls commonly used for stylus tips?

Ruby (synthetic aluminum oxide) offers exceptional hardness (9 Mohs), excellent wear resistance, chemical inertness, and can be polished to extremely fine surface finishes, making it ideal for precision measurement applications.

How does tip diameter affect measurement accuracy?

Smaller tips can access tighter spaces and measure smaller features but are more susceptible to wear and deflection. Larger tips provide better durability and stability but may not access confined areas. The diameter must be compensated in measurement software.

What maintenance do stylus tips require?

Regular cleaning with isopropyl alcohol, visual inspection for damage or wear, periodic calibration checks, and replacement when sphericity exceeds tolerance or surface shows significant wear.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Stylus Tip (Sphere)