Communications (nuts and bolts series)

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Bolt installation tool for tightening large nuts and bolts

Large bolts and nuts are accurately tightened to structures without damaging torque stresses. There are two models of bolt installation tool. One is rigidly mounted and one is hand held. Each model includes torque-multiplier unit

Trends in mechanical fasteners

Some of the specialty fasteners which are enjoying increasing usage are: thread rolling screws, self drilling and tapping screws, locking screws, tamperproof fasteners, and flanged bolts and nuts. The development of an optimum metric fastener system is recommended for future fastener manufacturing

The supersymmetric NUTs and bolts of holography

We show that a given conformal boundary can have a rich and intricate space of supersymmetric supergravity solutions filling it, focusing on the case where this conformal boundary is a biaxially squashed Lens space. Generically we find that the biaxially squashed Lens space S^3/Z_p admits Taub-NUT-AdS fillings, with topology R^4/Z_p, as well as smooth Taub-Bolt-AdS fillings with non-trivial topology. We show that the Taub-NUT-AdS solutions always lift to solutions of M-theory, and correspondingly that the gravitational free energy then agrees with the large N limit of the dual field theory free energy, obtained from the localized partition function of a class of N=2 Chern-Simons-matter theories. However, the solutions of Taub-Bolt-AdS type only lift to M-theory for appropriate classes of internal manifold, meaning that these solutions exist only for corresponding classes of three-dimensional N=2 field theories.Comment: 54 pages plus 7 appendices; v2: discussion of global properties of gauge field A in eleven dimensions improved and some parts of the paper rewritten to reflect this, new subsections 6.4.1, 6.4.2 and appendix F added, references added; v3: final version published in Nuclear Physics

Automatic, computerized testing of bolts

System for testing bolts with various platings, lubricants, nuts, and tightening procedures tests 200 fasteners, and processes and summarizes the results, within one month. System measures input torque, nut rotation, bolt clamping force, bolt shank twist, and bolt elongation, data is printed in report form. Test apparatus is described

ชุดฝึกทักษะการประมาณการขันอัดแป้นเกลียวและสลักเกลียว

This is an experimental research with the objectives to 1) Create and evaluate the exercise on the estimation skills of tightening Nuts and Bolts 2) To find out the effectiveness of exercise on the estimation skills of tightening Nuts and Bolts 3) To study the achievement of estimation skills of tightening Nuts and Bolts 4) To study the effectiveness of estimation skills of tightening Nuts and Bolts 5) To study the satisfaction of learners towards exercise on the estimation skills of tightening Nuts and Bolts. The researcher has created an exercise on the estimation skills of tightening Nuts and Bolts and has assessed the quality and effectiveness of the exercise created. It is experimented on 11 2nd year students in High Vocational Certificate level, Mechanics Department, Uthaithani Community College. The result analysis is done using statistics, average, standard deviation, percentage and T-test. The result found that 1) The evaluation result is at an excellent level 2) The effectiveness of exercise on the estimation skills of tightening Nuts and Bolts is at 96.78% 3) The achievement after learning is higher than before with significance level of 0.05. 4) The analysis result of the effectiveness of estimation skills of tightening Nuts and Bolts is 100/100, which is higher than the standard criteria. 5) Learner’s satisfaction result is at an excellent level