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CNC Control with Probing Cycle for 3D Shapes

Using Cycle 444 for 3D probing, the TNC 640 mill-turn control from Heidenhain provides automation and advanced probing routines that inspect free-form surfaces where measurement positions are often difficult to capture.

Posted: March 31, 2017

Using the versatile TNC 640 mill-turn control with conversational programming from Heidenhain, Cycle 444 checks one specific point on the surface of each workpiece. The contact point is determined by a vector that is normal to the 3D surface. The measurement cycle enables the measurement of 3D shapes, such as free-form surfaces of a mold part, and based on a defined tolerance range along the vector, checks the determined measured values.

The versatile TNC 640 mill-turn control with conversational programming from Heidenhain Corporation (Schaumburg, IL) is now available with an exciting new option, a 3D Probing cycle called Cycle 444. Ideal for demanding machining tasks in regard to speed, accuracy and high surface definition, the TNC 640 is a mill-turn control is already equipped with both manual and automatic probing cycles for datum setting, workpiece alignment and inspection. Now it offers this additional 3D probing cycle to meet manufacturers’ increased requirements for automation and advanced probing routines that inspect free-form surfaces where measurement positions are often difficult to capture.

Cycle 444 checks one specific point on the surface of each workpiece. The contact point is determined by a vector that is normal to the 3D surface. The measurement cycle enables the measurement of 3D shapes, such as free-form surfaces of a mold part, and based on a defined tolerance range along the vector, checks the determined measured values. It is advisable to determine the normal vector with the help of a CAD/CAM system.

For the automatic probing control cycle, a parameter is given for classifying a part as Good/Rework/Scrap. Additionally, the TNC outputs a log file with documented positions and deviations. If option 92 “3D-ToolComp” is active on the TNC 640, a touch probe can be recalibrated using a calibration ball and the system accuracy for measurements can be improved in this manner. The key here is that the touch probe is re-calibrated for various contact points along the ball-tip of the touch probe styli. In this way, repeatability is increased for the vectors formed by the contacts points and the spheres’ centers. Heidenhain also offers the TS 460 universal touch probe with optical trigger mechanism for higher repeatability and also features a collision adapter.

Heidenhain Corporation, 333 East State Parkway, Schaumburg, IL 60173, 877-565-9151, www.heidenhain.us.