Comparison between a Laser Micrometer and a Touch Trigger Probe for Workpiece Measurement on a CNC Lathe

Abstract

The current requirements for an efficient dimensional inspection of manufactured parts have lead to development of different in process and on-machine measurement (OMM) techniques. Touch trigger probes (TTP) are the most common technologies utilized, inspired on contact probes used on coordinate measuring machines (CMMs). The on-machine accuracy of TTPs depends upon precision of the tool-machine control as well as upon the procedure for TTP presetting. Taking this into account, a different OMM technique is considered in this work, which consists on a laser micrometer (LM) that is commonly used for in-process measurement of continuous products. The behaviour of TTP and LM is analysed and discussed in terms of repeatability and reproducibility. Results obtained by both techniques are compared each other by measuring a cylindrical workpiece and by checking the results with those obtained on a CMM.

Machining Error Compensation of Single Shaft Part Based on Touch Trigger Probe

“…In the turning center, the touch trigger probe is installed in the tool magazine, the axis of the workpiece and the spindle center coincide, with the instruction used to call the tool to call the probe, the probe can stop and measure the workpiece size when the workpiece is touched, then the measurement results can be locked in the macro variables of numerical control system [6] . FIGURE 1.…”

An Automatic Error Surface Diagnostics During Turning Machining Operation Using Laser Sensor

“…Some approaches to in-process dimensional control and measurement were described almost 30 years ago by [Fan 1991], then for example by [Yandayan 1997], [Vacharanukul 2005], [Ko 2007] and [Czarske 2013]. The experiments with measuring in Lathe machines were described, for example, in the works [Jeong 2005], [Kuschmierz 2016], [Zou 2017] and using laser sensors in the articles [Dorsch 1994], [Günther 2009], [Valino 2012] and [Gunther 2013]. New approaches to data acquisition and principles of digital data storage from the production process to industrial Cloud Platforms can be found in the articles [Lu 2019], [Mahmoud 2019], and [Zidek 2020].…”

Optical, in situ, three-dimensional, absolute shape measurements in CNC metal working lathes

“…Shadow projection for instance can scan the absolute three-dimensional shape of a shaft in just a few seconds [12] and was already successfully applied in a metal working lathe. However, it is unable to resolve concave profiles and too bulky to easily fit into a lathe, since sending and detection unit of the system are on opposite sides of the specimen.…”

“…As a result, the light with 3 Three mutually tilted interference fringe systems of a P-LDDS (top), and resulting calibration functions. The unambiguous calibration function ϕ 31 , which results from the fringe systems 3 and 1, offers an absolute distance measurement with higher distance uncertainty, while the steep calibration function ϕ 12 , which results from the fringe systems 1 and 2, offers a low distance uncertainty the wavelength λ 2 is focussed into the upper multimode fiber A. The scattered light with the wavelengths λ 1 and λ 3 is focussed into the lower multimode fiber B and divided by wavelength in a separate fiber coupled unit.…”