INDUSTRY COMPONENT

Contact Probe

A precision contact probe used in coordinate measuring machines (CMMs) for dimensional inspection and quality control in manufacturing.

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Component Specifications

Definition
A contact probe is a precision measurement component in coordinate measuring machines (CMMs) that physically touches the workpiece surface to collect dimensional data points. It consists of a stylus with a spherical tip, a probe head with deflection sensors, and a mounting interface. When the stylus contacts the workpiece, the probe detects deflection and triggers a measurement signal, recording the exact position in three-dimensional space for geometric dimensioning and tolerancing (GD&T) analysis.
Working Principle
The contact probe operates on tactile sensing principles. When the stylus tip contacts a workpiece surface, it deflects slightly, triggering sensors (typically strain gauges or optical sensors) in the probe head. This deflection generates an electrical signal that indicates contact has been made. The CMM's controller records the machine's position at that moment, creating a precise 3D coordinate point. The probe can perform single-point measurements or scanning motions along surfaces.
Materials
Stylus: Tungsten carbide or ceramic shaft with ruby (synthetic sapphire) spherical tip (typically 0.3mm to 8mm diameter). Probe body: Aluminum alloy or stainless steel with hardened steel components. Internal sensors: Strain gauges or optical elements with electronic circuits.
Technical Parameters
  • Repeatability 0.1μm to 0.5μm
  • Trigger Force 0.1N to 1.0N
  • Stylus Tip Diameter 0.3mm to 8mm
  • Connection Interface M2, M3, or proprietary mounting systems
  • Operating Temperature 15°C to 30°C
  • Maximum Approach Speed 10mm/s to 50mm/s
  • Maximum Permissible Error (MPE) ±0.5μm to ±2.5μm
Standards
ISO 10360, ISO 15530, DIN 32876, VDI/VDE 2617

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Contact Probe.

contact probe CMM probe dimensional measurement coordinate measuring machine inspection probe metrology equipment quality control tactile probe Contact Probe in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Contact Array

A structured arrangement of electrical contact points within a test fixture interface.

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Engineering Analysis

Risks & Mitigation
  • Stylus wear affecting measurement accuracy
  • Probe damage from collision or excessive force
  • Temperature variations causing thermal expansion errors
  • Contamination (dust, oil) on stylus tip
  • Electrical interference affecting signal transmission
FMEA Triads
Trigger: Excessive approach speed or incorrect programming
Failure: Probe collision damaging stylus or internal components
Mitigation: Implement speed limits in CMM software, use protective covers, and conduct operator training on safe probing practices
Trigger: Accumulation of contaminants on stylus tip
Failure: Measurement errors due to false triggering or offset
Mitigation: Regular cleaning with approved solvents, maintain clean measurement environment, implement daily verification procedures
Trigger: Thermal expansion from temperature fluctuations
Failure: Dimensional measurement drift exceeding tolerance
Mitigation: Maintain stable temperature environment (20°C ±1°C), allow thermal stabilization time, use temperature compensation in CMM software

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Maximum Permissible Error (MPE) as per ISO 10360-2: Typically ±(1.0 + L/350) μm where L is measurement length in mm
Test Method
Performance verification using reference artifacts (spheres, gauge blocks) according to ISO 10360 series standards. Daily calibration using master sphere with form error <0.1μm.

Buyer Feedback

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Frequently Asked Questions

What is the difference between a contact probe and a non-contact probe?

Contact probes physically touch the workpiece with a stylus, providing high accuracy for hard materials with defined surfaces. Non-contact probes (like laser or vision systems) measure without physical contact, suitable for delicate or soft materials but may have different accuracy characteristics.

How often should contact probes be calibrated?

Contact probes should be calibrated daily or before critical measurements using a reference sphere. Full performance verification should follow manufacturer recommendations, typically every 6-12 months or according to ISO 10360 standards.

Can contact probes measure soft or delicate materials?

Yes, with appropriate selection. Low-force probes (0.1N-0.3N) with larger tip diameters can minimize surface deformation. For very delicate materials, non-contact methods might be preferable to avoid any marking or damage.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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