The author says in the preface : " Nothing but a strong conviction of being in the right could justify the author of the following pages for expressing views which must give a violent wrench to preconceived opinions, and which will almost certainly be met with opposition from all parties. In justice to himself, and as some explanation of the revolutionary statements here made, it may be added t...

According to the problem of screw fracture of electric submersible pump unit in Shengtuo oilfield, the reasons for the screw fracture are analyzed from three aspects: material, strength and pretightening force. The preliminary result shows that the imbalanced pretightening force of screw is the main reason of screw fracture. By means of Ansys software, the static and modal analyses for the elec...

This paper describes RUR53, the unmanned mobile manipulator robot developed by the Desert Lion team of the University of Padova (Italy), and its experience in Challenge 2 and the Grand Challenge of the first Mohamed Bin Zayed International Robotics Challenge (Abu Dhabi, March 2017). According to the competition requirements, the robot is able to freely navigate inside an outdoor arena; locate a...

A framework tackling the problem of large wrench application using robotic systems with limited force or torque actuators is presented. It is shown that such systems can Ž . apply a wrench to a limited set of Cartesian locations called force workspace FW , and its force capabilities are improved by employing base mobility and redundancy. An efficient numerical algorithm based on 2 -tree decompo...

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...

For humans, power is in part control over their lives. History is a collection of past experiences that empower informed actions. A repertoire is the catalog of your things. A large diverse repertoire can be critical or it can be irrelevant. A great hammer is nice if the job involves a nail. You might have lots of wrenches, but not the one that bends the right way for the “tough nut”. The wrong...

PURPOSE To determine the nature and the origin of metallic foreign particles appearing on the iris after phacoemulsification surgery. SETTING P.D. Hinduja Hospital and Medical Research Centre, Mumbai, Maharashtra, India. DESIGN Case series. METHODS Metallic foreign particles were observed on the iris surface and the pupillary border on the first postoperative visit after phacoemulsificati...

BACKGROUND As one of the loads applied in implant dentistry, managing the torque is important for the success of an implant treatment. For this purpose, it is crucial to ascertain the level of torque being exerted with a hand driver. We have developed an adapter that makes it easy to measure torque by using a standard torque wrench in one's possession, rather than with a torquemeter. PROCEDUR...

Motion planning in multi-contact scenarios has recently gathered interest within the legged robotics community, however actuator force/torque limits are rarely considered. We believe that these limits gain paramount importance when the complexity of the terrains to be traversed increases. For this reason we propose two new six-dimensional bounded polytopes named the Actuation Wrench Polytope (A...