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February 2014

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Inspection Systems for Measurement of Cylinder Heads

The VSM and SIKO Valve Seat Inspection Systems from Euro-Tech Corporation are designed for the complete measurement of cylinder heads. Applications include automotive, small engine, off-road vehicle, motorcycle and diesel engine.

The VSM is a manual gage and uses mandrels armed with inductive built-in transducers. The mandrel is connected to a DC motor via a cardan coupling with clutch and a pair of gear wheels with stop cam. By turning 360°, the mandrel controls the difference between the seat and the shaft. The VSM consists of the mandrel, joint coupling, a hollow shaft and a driving component.

"Unlike a CMM, the VSM does not have a spatial frame of reference," said a company spokesperson. "The mandrel itself creates the reference between the geometry of the guide bushing and the valve seat. It centers in the lower end of the bushing and in the valve seat. Therefore, the dual valve of the measurement results in a value according to the run out of the bushing axis and the center of the valve seat. Ultimately, the mandrel develops a reference axis and measures the eccentricity of the bushing to this axis. Measurement by the VSM is fast, taking only three seconds for a reading."

The SIKO consists of a measuring head adapted to the valve seat, a universal linear slide and a measuring computer. When inserted into the cylinder head, it lays on the seat like a valve. After initial instruction the inductive built-in transducer (IET), with a diamond tip, scans into the seat. The IET slides over the valve seat and fore and aft chamfers. The touching force is low, between 0.3 and 5.0 N. The travel of the slide is 5 mm with a deviation of 0.2 m. After the measurement has been finished, the profile of the valve seat will be displayed on a monitor in a graphic and/or numerical format. Measurement time is eight seconds.

The Siko measures valve seat angle, width and straightness/crowning, and also charts surface roughness and gage line location. When SIKO is inserted in the cylinder head, it lays on the seat like the valve. Then a built-in inductive transducer (IET) with a diamond tip slides over the valve seat and chamfers. After eight seconds the measurement is finished and the profile of the valve seat is displayed on the monitor.

Options include the Slide Scan, which is a variation of the SIKO gage offering dual slides, resulting in no operator influence in the one-step measurement. Both gages are designed for shop floor use and can withstand rough conditions while maintaining reliable measurements, according to the company.

For more information contact:

Euro-Tech Corporation

N48 W14170 Hampton Avenue

Menomonee Falls, WI 53051


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