The combination of the Cincom M32 and TC76-DIGILOG has been running smoothly and efficiently in Lehmann's production operations since February 2015. The sequence is as follows: At the start of a production run, a reference part is clamped onto the machine and the complete contour of the corresponding slot is scanned and recorded. The master profile recorded and saved in the evaluation software. The subsequent production workpieces are measured and compared against the recorded profile, and any that exceed the tolerance are discarded. As a result, the tight tolerances of the slot are reliably checked immediately after the cutting process in the lathe. In-machine measurement itself delivers enormous benefits. If it is run without problem in the idle times, as in Parker Hannifin's quick-coupler production, it is hard to beat. It allows Lehmann to implement 100 percent checking, with error trends being detected at an early stage by evaluation software.
Incidentally: it doesn't matter whether the TC76-DIGILOG is fitted in a grinding machine or a milling machine. And thanks to its increased scanning forces, it is even well suited to the tough demands of applications in lathes. The TC76-DIGILOG scans the part accurately and non-directionally, measuring with supreme precision thanks to the patented shark360 measuring mechanism. "Neither coolant nor viscous oils impair the reliability of the measurement data. With its higher scanning force, the touch probe simply pushes through the coolant," adds David Cousins.
The Blum-Novotest/Citizen combination is also used for other large production lots from 10,000 to 30,000 pieces. The processed materials are wide-ranging: from stainless steels, heat-treatable steels and free cutting steel, to aluminium. "Given that we were close to having to refuse the quick-coupler order from Parker Hannifin, we are delighted to have found such a powerful solution in the combination of Blum touch probe and Citizen machine," Timo Lehmann concludes with satisfaction.
Machining contractor Karlheinz Lehmann GmbH is based in Oberwolfach in Germany's Black Forest. At its 1,000 square metre site, the family business employs 17 people, operating 20 state-of-the-art CNC lathes and milling machines, mostly in the manufacture of high-precision rotationally symmetrical parts. The company has been trading for over 40 years, and is now managed in the second generation by the founder's son and daughter. Lehmann employs state-of-the-art technology to manufacture small and large production runs in a three-shift operation – though the night shift is unmanned. The traditional family company's motto is "Cutting skills in perfect precision", and it is based on those principles that it has established a customer base including major international corporations such as Parker Hannifin.