Choosing the Right Styli for Precision Measurement
In the world of metrology, precision is everything. Whether you’re working with coordinate measuring machines (CMMs) or other high-accuracy measuring devices, the right styli can make all the difference. From standard straight styli to more complex configurations, each type serves a specific purpose to ensure accurate, reliable measurements. In this guide, we’ll explore different types of styli and their applications.
Straight Styli: The Industry Standard
Straight styli are the most commonly used type and are ideal for inspecting simple features where direct contact can be made. These styli typically feature a ball as the probing element, except for pointed variants (Type K), which use hardened stainless steel or tungsten carbide tips. Available in single-stepped or multi-stepped designs, straight styli offer versatility for various measurement tasks.
Star Styli: Versatility in Measurement
Star styli provide a flexible solution for measuring complex geometries. With multiple fixed probe arms, they can capture measurements in various orientations, making them ideal for undercuts, threads, and large diameters. Their rigid structure ensures precise readings even with long gauging lengths.
Adapters and Holders: The Core of CMM Integration
Adapter plates serve as the central interface between the measuring machine, the probe, and the workpiece. Many modern adapters include an electronic identification chip for automatic probe recognition. By allowing easy interchangeability of different styli, adapters enhance efficiency and accuracy in measurement processes.
Extensions: Reaching the Unreachable
When measuring hard-to-reach areas, extensions come into play. These components extend the probe’s reach while maintaining stability and accuracy. To minimize measurement deviations, metrology standards recommend keeping extensions as short and rigid as possible, reducing connection points to a minimum.
Cylinder Styli: When Spherical Probes Fall Short
Sometimes, a ball probe is not the optimal choice—especially when measuring features like punched hole endpoints in metal sheets. In such cases, cylindrical styli offer an alternative by enabling precise contact along the stem rather than just a single point. Some variations even allow for end-face or full-surface probing.
Disk Styli: Ideal for Internal Measurements
Disk styli, made from precision-cut sections of a spherical ball, excel in measuring large internal diameters and undercuts. However, standard disks are not suitable for probing in the Z direction unless equipped with radius end rollers, making them highly specialized tools for specific applications.
Hemispherical Styli: Maximizing Contact Surface
For measurements requiring a large probe ball diameter but with a lightweight or compact design, hemispherical styli provide the ideal solution. Unlike disk probes, which primarily allow radial probing, hemispherical styli enable full-surface contact, improving measurement accuracy for various geometries.
Selecting the Right Stylus for Your Needs
Choosing the correct stylus depends on the application, material, and accuracy requirements. Factors like rigidity, contact surface, and accessibility should all be considered. By selecting the right combination of styli, adapters, and extensions, engineers can optimize their measurement setups for maximum precision.
Whether you're performing standard inspections or tackling complex measurement challenges, investing in high-quality styli ensures reliable results. Explore our range of precision-engineered styli to enhance your metrology capabilities today!
