This method has been applied to circuit board component defect detection in our laboratory. Compared with the traditional method of microscope focus correction, this method has the advantages of high accuracy, good linearity and fast focus speed for the actual requirements of industrial inspection processes. The analysis of the experimental results proves the feasibility of using this method in industrial applications. Preliminary experiments with a 50x objective lens show that the measured values are consistent with the theoretical values, have good linearity and possess a focusing accuracy of 0.2μm within ☓0μm of the focal plane. To control a PZT to achieve real-time auto-focusing, a Gaussian curve fitting method is used to process the spot information with the presented mathematical model giving the relationship between the detection value and the defocus value FES. The light reflected from the surface of the object reaches a CCD camera and forms a spot via a set of optical devices. The approach combines infrared light at a wavelength of 808nm with visible light. Here, a distance-measuring approach based on the laser triangulation principle is proposed with a corresponding mathematical model to overcome these problems and to satisfy the requirements of an industrial TFT-LCD (thin film transistor liquid crystal display) Inspection Microscope System in active auto-focus applications. Meets OSHA requirements (minimum five to one safety factor).Limitations of the pinhole method and astigmatic defocus detection have difficulties in determining the direction of defocus and a restricted linear correction range.Color coded and stamped with rated capacity to provide quick identification.Available in 1/2, 2, 5, and 10 ton maximum rated capacities.Lifting lugs are designed to be welded to compatible steel materials in order to lift them into place safely and securely. Lifting lugs are an essential component for for rigging and are a popular product in Northern Strands Industrial Supplies Warehouse. Lifting lugs have been available from Northern Strands for many years and have been used by local farmers, construction companies, and underground mines across Canada. Locally owned and operated since 1970, Northern Strands has continuously provided a wide variety of industries with the best prices on industrial equipment and supplies. Northern Strands is one of the top lifting lug and d-plate suppliers in Saskatoon and Saskatchewan.

Lift lug design