Liberty Technologies, Inc.

CONTURA G2 aktiv

	Designed for measuring deep features or projected tolerance zones over long distances, self-centering probings, and high throughput needs.
	ZEISS Active Scanning with VAST XT for multi-point measurement of size, form, and position

Are you measuring...

Do you need scanning?
Scanning gives you much better information about your workpiece. Continuous measurement of features and contours provides the high point density needed for determining actual shape. Measurements become more reliable and stable with shorter throughput times.

Does it fit or doesn’t it?
A mating part may not fit correctly to a bore measured with only 4 points. The calculated circle only provides an idea of its location and a guess as to its functional size. 1000s of points gives you the complete geometry (location, form and size) and allow you to calculate the largest diameter able to fit into the bore. In the Proper Fit example below, a cylinder is measured with 4 points and scanned (red). The least squares bestfit circle (yellow) is calculated from 4 points. The maximum inscribe circle is calculated from scanning data. They provide different mid-point coordinates.

Cylinder Measurements
With its high dispersion and low repeatability, single point measurement yields results of low accuracy. Scanning guarantees results of optimum quality and density due to its low dispersion and high repeatability. In the Cylinder Measurement below, single point results are shown at left and scanning results at right.

Proper Fit	Cylinder Measurement

Segments and Partial Features
When measuring small sections of geometrical elements like spheres, cones, cylinders, and surfaces, scanning provides more stable results. A partial inner radius, for example, using single point measurement can produce a variety of mid-point coordinates. Scanning not only measures it correctly, it also does it faster. In the Partial Feature example below, it shows two single point measurements (3 points each) and a scan.

A Prerequisite for Gage R&R
Alignment can be critical in Gage Repeatability and Reproducibility. When a part is removed and replaced (shown at top), it isn’t necessarily placed in the same position—which causes different results when measuring only 4 points. With scanning, even if the part is removed or replaced and not in the same position, you will get correct and repeatable results.

In the example below, the left two circles are single point measurements of the same feature in two different positions....which produces two different mid-point coordinates. The right two circles are scanned measurements of the same feature in two different positions...which produces the same mid-point coordinates.


Key Benefits of ZEISS Scanning

	Fast scanning of form features for prismatic workpieces featuring circles, cylinders, cones, planes and even single point for basic tasks.
	Scanning of known contours for curves and free-form surfaces and unknown contours, ideal for digitizing in tool and moldmaking.
	Self-centering probing for grooves or cavities.
	Automatic selection of scanning speed based on the required accuracy.
	CONTURA G2 aktiv For active single-point measuring, configure the CONTURA G2 aktivwith the high-performance DynaTouch (DT) sensor. For the benefits of ZEISS Active Scanning, select VAST XT. DT Sensor DT measures using an integrated dynamic system. It is much more reliable, robust and reproducible than conventional single-point systems which are more sensitive to variations in materials, stylus geometries, or ambient conditions. DT permits flexible use of complex stylus configurations. Automatic weight balancing lets you mount heavy styli (up to 500 g) or even one-sided loads. Probe deep bores using long extensions, up to 500 mm in any direction. Or, measure tiny features with very small tips...as small as 0.5 mm. Multiple styli can be used in a single probe combination. DT has a self-centering feature that allows you to measure a specific point at the bottom of a feature, like a V groove or radius, to accurately measures the characteristic. DT has an affordable upgrade path to VAST XT. The sensor fits the same mounting socket, holds the same stylus combinations and weights, the stylus adapter plate and magazine are identical, and measuring runs are created and evaluated using the same software. VAST XT Sensor VAST XT is suitable for all applications in curve and free-form metrology and reverse engineering. VAST XT offers Active Scanning and singlepoint measuring. With its high-speed, highpoint density capability, VAST XT can handle virtually any task, including form inspection, scanning of curves and free-form surfaces, digitizing for reverse engineering, and more. VAST XT is active because it monitors probe head deflection continuously. A consistently low measuring force is generated, controlled, and applied by the probe to reduce dynamic influences, such as stylus bending. VAST XT gives you the same capabilities as the DT, such as flexible use of complex stylus configurations, self-centering capability, etc. Application Examples Aircraft Engine Air Foils (vanes) Bearings Brake Components Cams Castings Crankshafts CV Joints Cylinder Blocks Cylinder Heads Disk Drive Components EDM Parts Electrical Connectors Low-Accuracy Dies and Tools Medical Implants Plastic Moldings Styrofoam Transmission Components Wheels