Posúdenie vplyvu použitia univerzálneho vrutu a vrutu novej generácie s klzným povlakom

Thesis deals with the assessment of the impact of using the classic universal screw and screw the new generation with a sliding coating on various aspects of the production process. It was judged mainly possibility to join two operations into one: pre-drilling and screwing. This opportunity of screws the new generation would mean omission of pre-drilling at joints in hard hardwood, which would result in savings in labor time and costs for making joints. This option would therefore have a major impact on the economic factor in the production of furniture. Furthermore, it was determined the strength of cordless drill screwdriver needed to tighten screws into hardwoods - beech, and watched the wear on drill bits of cordless screwdriver associated with increased effort on tools of missed pre-drilling operation. This issue relates, for example, the manufacture of chairs, supporting frames of upholstered furniture as well as garden furniture or wooden constructions. During the tests it was used solid beech wood, as a classic representative of the hardwood deciduous wood, widely available and often used in the manufacture of furniture. The focus of this work was to observe the characteristics of the three selected types of wood screws in two dimensions. The results of observations and measurements were noted, photographically documented, analyzed and evaluated