A fuzzy-logic controller supporting the manufacturing of wind turbines and the bolt tightening of their hubs has been designed. The controller embeds assembly error recognition capability and detects tightening faults like misalignment, different threads, cross threads and wrong or small nuts. According to this capability, K-nearest classifiers have been implemented to cluster the output contro...

Abstract Correct torquing of bone screws is critical for positive patient outcomes in orthopaedic surgery. Under-or over-tightening can lead to thread stripping or screw loosening, leading implant/fixation failure and potential tissue damage disability. It has been proposed that an automated torque-limiting smart-screwdriver may be able use model-based methods determine the properties as are in...

Background and Aim: Screw loosening is a common problem with both screw-retained and cemented implant restorations. It is assumed that the abutment diameter affects detorque value and screw loosening. We aimed to determine the effect of two different abutment diameters on detorque value using cyclic loading and thermocycling. Materials and Methods: This in-vitro experimental study was conducte...

Introduction: Some clinicians use a handheld screw driver instead of a torque wrench to definitively tighten abutment screws. The aim of this study was to compare the removal torque of one-piece and two-piece abutments tightened with a handheld driver and a torque control ratchet. Methods: 40 ITI implants were placed in acrylic blocks and divided into 4 groups. In groups one and two, 10 ITI one...

Purpose Friction-style and spring-style torque wrenches are used to tighten implant abutments and prosthetic screws. The mechanical stability of these torque wrenches is crucial for the implant-abutment connection. The purposes of this study were to assess the performance of five brands (Straumann, Zimmer, Implant KA, Bredent, and Biohorizons) of wrench and to evaluate possible changes in appli...

A reliable electricity transmission network has a vital role in modern society. The long service life and the capital intensity emphasize the importance of distribution network design and selecting good quality components. The thesis addresses quality related factors in underground cable connectors. The connections in underground cable connectors are widely established by screwing. The performa...

In the production industry, quality control is of importance. Even though today's tools provide a lot of functionality and safety to help the operators in their job, the operators still is responsible for the final quality of the parts. Today the nutrunners manufactured by Atlas Copco use their driver to detect the tightening angle. Therefore the operator can influence the tightening by turning...