Sensing Tip/Head: Temperature Range 0°C to 40°C

Q: Why is ruby commonly used for sensing tips?

Ruby (synthetic sapphire) offers exceptional hardness (9 Mohs), excellent wear resistance, and good chemical stability, making it ideal for maintaining measurement accuracy over thousands of contact cycles without significant deformation.

Q: How often should sensing tips be calibrated or replaced?

Calibration should be performed daily or before critical measurements. Tip replacement depends on usage intensity—typically every 6-12 months for continuous operation, or when wear exceeds 0.5μm deviation from original sphericity.

Component Specifications

Definition

The sensing tip or head is a critical component of measurement probes used in coordinate measuring machines (CMMs), profilometers, and other precision metrology equipment. It serves as the physical interface that contacts the workpiece to collect dimensional data, surface topography, or geometric features. These components are engineered for minimal deformation, high wear resistance, and consistent contact behavior to ensure measurement accuracy and repeatability across thousands of cycles.

Working Principle

The sensing tip operates by making physical contact with the target surface, transmitting displacement or force signals through the probe's internal mechanism (typically strain gauges, piezoelectric sensors, or optical encoders). When contact occurs, the tip deflects slightly, generating an electrical signal that corresponds to the precise position of contact. This data is processed to calculate dimensional measurements, surface profiles, or geometric tolerances.

Materials

Ruby (synthetic sapphire) is standard for spherical tips due to extreme hardness (9 Mohs) and wear resistance. Alternative materials include silicon nitride, zirconia, or diamond-coated carbide for specialized applications. Shafts are typically made of stainless steel, tungsten carbide, or ceramic for stiffness and thermal stability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	1500-2000 HV (Ruby)
Sphericity	<0.1μm
Tip Diameter	0.1mm to 10mm
Maximum Force	0.1N to 1N
Stem Diameter	1mm to 6mm
Temperature Range	0°C to 40°C

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 2257

Parent Products

This component is used in the following industrial products

Measurement Probe

A sensing element that directly contacts or interacts with the material surface to detect thickness variations.

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Engineering Analysis

Risks & Mitigation

Tip wear causing measurement drift
Contamination from oils/debris
Impact damage from collisions
Thermal expansion affecting accuracy

FMEA Triads

Trigger: Abrasive wear from repeated contact
Failure: Increased tip diameter and loss of sphericity
Mitigation: Regular calibration, use of harder materials (diamond coating), and implementing probe approach optimization

Trigger: Improper cleaning procedures
Failure: Contamination buildup affecting contact consistency
Mitigation: Establish cleaning protocols with approved solvents and lint-free wipes, implement regular maintenance schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1μm for diameter, ±0.05μm for sphericity

Test Method

Laser interferometry for dimensional verification, roundness testing for sphericity, hardness testing per ISO 6507

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 Sensing Tip/Head

Manufacturer profiles associated with Sensing Tip/Head.

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Frequently Asked Questions

Why is ruby commonly used for sensing tips?