Camshaft Measurement

Cylindrical parts like camshafts or gearshafts are major components of the power train in a vehicle. The mechanical precision of these parts is the foundation for a long life and a high fuel efficiency of the engine.

During the manufacturing of such parts gages are employed close to the assembly line as well as in separate inspection labs. These gages are responsible for a smooth production with a minimal scrap rate.

Until now the majority of the gages in the inspection lab are exclusively equipped with tactile probes. To measure complex part geometries like an angular position of a timing wheel or a chain wheel, they require special adapters. These adapters have to be manually attached to each part that is to be measured.

The complexity and diversity of camshafts and related parts is steadily increasing, while the typical lot size in manufacturing is down to a few hundred parts. This means that the demand for more flexible gages in the inspection lab is going up.

Lightscope2 en

VOLAS has designed a flexible optical measuring device based on laser triangulation for the US-based Adcole Corporation, the leading manufacturer of gaging systems for cam- and crankshafts. The device, called LightScope, is available in variants for horizontal and vertical camshaft gages and can easiliy be adapted to an existing gage. It is completely integrated into the software of the gage.

LightScope has three axes of motion and can observe the laser spot from two orthogonal directions. Distance readings can be taken in a range of about 12 mm and with an accuracy of a few microns. In parallel to each distance reading the LightScope also registers the positions of its internal axes and those of the gage with high precision.

The addition of an optical device widens the spectrum of possible measurements. Characteristics like the angles of a timing wheel or the position keyway can be measured without any special adapter with high accuracy and in a flexible way.

Axial characteristics like the position of lobes can be measured much faster than before. The laser just scans along the shaft, and the positions of all parts are calculated from the resulting point cloud.