Hybrid Measuring System
Makino (Mason, OH) has developed a hybrid automatic tool-length measuring system that is available on its precision Hyper 2J, V22 and V33 high-performance vertical machining centers.
Makino (Mason, OH) has developed a hybrid automatic tool-length measuring system that is available on its precision Hyper 2J, V22 and V33 high-performance vertical machining centers. The system is designed to obtain high-quality machined surfaces. With these superior and more accurate surface finishes, polishing and bench time can be eliminated—thus reducing leadtimes. The key is to measure the position of the tip of the rotating machining tool at the submicron level. Measuring the tip of the tool in a highly accurate and stable manner is vital, taking the expected thermal displacement caused by spindle rotation into consideration. Measuring by a contact sensor is an appropriate method to achieve high accuracy measurement, as cutting oil or chips do not easily affect it. There also is a method for measuring accurately by a non-contact sensor, as well as a combination of processes.
This system combines the contact and non-contact measuring options. The tip of the machine tooling is brought in contact with the low contact, pressure-contact sensor while the spindle is stopped. The effect of vibration can thus be minimized and the position of the tool tip is measured highly accurately. The spindle with the machine tooling in place is rotated at a speed used during the machining process, and a non-contact sensor measures the position of the spindle end. By measuring the end of the spindle, which has specified shape and accuracy as a machine component, it is possible to measure the position, accounting for thermal displacement caused by the spindle rotation in a highly accurate and in a stable manner.