Measurement Probe (Stylus) for CMMs | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Measurement Probe (Stylus)

Definition

The measurement probe, specifically the stylus, is the critical contact component of a Coordinate Measuring Machine (CMM). It is the physical interface that makes direct contact with the surface of a workpiece. Its primary role is to precisely detect the point of contact and transmit this positional data to the CMM's controller. The stylus tip's geometry (e.g., spherical ruby) defines the exact measurement point, enabling the CMM to calculate dimensions, geometric tolerances, and surface profiles with high accuracy. The stylus is mounted on a probe head. When the stylus tip contacts the workpiece surface, it triggers a deflection or signal in the probe mechanism (e.g., a strain gauge, piezoelectric sensor, or optical switch in a touch-trigger probe, or measures continuous deflection in a scanning probe). This event signals the CMM controller to record the precise X, Y, Z coordinates of the machine's position at that instant. For scanning probes, continuous analog signals of deflection are recorded as the stylus moves along the surface. The stylus is available with various tip diameters (0.5–8 mm), lengths (10–100 mm), and measuring forces (0.1–0.5 N). Repeatability is ±0.5 µm, and pre-travel variation is ±0.3 µm. Maximum deflection is ±15°, with over-travel protection of ±3 mm. Operating temperature range is 10–40 °C, storage range -10–60 °C, and IP rating is IP54 per IEC 60529. Common materials include tungsten carbide or ceramic for the shaft and ruby for the tip. Weight ranges from 10–50 g, and connection threads are M2–M5 per ISO 68-1. These values are reference ranges; verify model-specific specifications with the manufacturer.

Working Principle

The stylus is mounted on a probe head. When the stylus tip contacts the workpiece surface, it triggers a deflection or signal in the probe mechanism (e.g., a strain gauge, piezoelectric sensor, or optical switch in a touch-trigger probe, or measures continuous deflection in a scanning probe). This event signals the CMM controller to record the precise X, Y, Z coordinates of the machine's position at that instant. For scanning probes, continuous analog signals of deflection are recorded as the stylus moves along the surface.

Common Materials

Synthetic Ruby (Tip), Tungsten Carbide or Stainless Steel (Shaft), Ceramic (Shaft)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Probe Tip Diameter	0.5–8 mm	Smaller tips access tight features; larger tips are more robust.
Probe Length	10–100 mm	Longer probes reach deeper but reduce rigidity.
Measuring Force	0.1–0.5 N	Lower force minimizes part deformation.
Repeatability	±0.5 µm	Critical for consistent measurements.
Pre-travel Variation	±0.3 µm	Affects accuracy in multi-direction probing.
Maximum Deflection	±15 °	Allows measurement of angled surfaces.
Over-travel Protection	±3 mm	Prevents damage on accidental collision.
Operating Temperature Range	10–40 °C	Outside this range, thermal drift affects accuracy.
Storage Temperature Range	-10–60 °C	Protects electronics and materials.
IP Rating	IP54	Dust and splash water protection.IEC 60529
Probe Material	Tungsten carbide	High stiffness and wear resistance.
Tip Material	Ruby	Hard and wear-resistant; low thermal expansion.
Weight	10–50 g	Lighter probes reduce inertial effects.
Connection Thread	M2–M5	Standard thread sizes for compatibility.ISO 68-1

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

Components / BOM

Stylus Tip (Sphere) Part
The precision spherical element that makes direct contact with the workpiece surface. Its geometry defines the measurement point.

Material: Synthetic Ruby
Stylus Shaft Part
The rod that connects the tip to the probe body or extension. It provides the necessary reach and must minimize bending.

Material: Stainless Steel or Tungsten Carbide
Mounting Thread/Interface Part
The mechanical connection (e.g., M2, M3 thread, kinematic mount) that attaches the stylus to the probe head or an extension.

Material: Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Coordinate Measuring Machine (CMM)

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Coordinate Measuring Machine

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Manufacturers of Measurement Probe (Stylus)

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Frequently Asked Questions

What is the typical tip diameter range for a CMM stylus?

According to the directory, the tip diameter typically ranges from 0.5 to 8 mm. Smaller tips access tight features, while larger tips are more robust. Always confirm the exact diameter for your specific application with the manufacturer.

What materials are commonly used for the stylus shaft and tip?

The shaft is commonly made of tungsten carbide or ceramic, and the tip is typically synthetic ruby. These materials offer high stiffness, wear resistance, and low thermal expansion. Verify material grades with the supplier.

What is the repeatability of a typical CMM stylus?

The directory lists repeatability as ±0.5 µm. This indicates the consistency of measurements under repeated probing. However, actual repeatability depends on the entire CMM system and must be verified for the specific model.

What is the operating temperature range for a CMM stylus?

The operating temperature range is 10–40 °C. Outside this range, thermal drift can affect accuracy. The storage temperature range is -10–60 °C. Always check the manufacturer's specifications for your environment.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric pressure environment, no pressure rating as it operates in standard CMM conditions
other spec:	Maximum stylus deflection: 0.5-1.0mm depending on probe type, Measurement force: 0.1-1.0N typical, Vibration tolerance: <0.5g, Humidity: 30-70% RH non-condensing
temperature:	15-25°C (59-77°F) typical operating range, with thermal stability ±0.5°C/hour recommended for precision measurements

Measurement Probe (Stylus)

Product Specifications

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