The project ?Investment proposal for grinding station for service work of screw feeders? has been performed during the spring semester 2014 for the course Bachelor?s thesis for degree of  Bachelor of science in machine engineering at Karlstad?s University. The project has been performed in cooperation with Fiber Workshop which is a service department in the company Valmet AB. Valmet AB is a company that develops and manufacture soft paper tissue machines. The screw feeder is a part that is used to feed, and squeeze out the water out of woodchips.

In this essay I have looked more closely at different means of grinding wood prior to the mass production and total dominance of the sandpaper in recent times as there is virtually no information to be found about this. I have also done a few replicas of how early sandpapers might have looked and as a part of creating these replicas I have also tested diffrent types of early glues. The conclusion of it all is that all the alternative grinding materials tested workd virtually as well as modern sandpaper, with some reservations. And the replicas, although rough, worked mostly well despite being constructed with simplicity in mind. This indicates that an artisan could easily construct sandpapers if he so wished..

The aim of this essay is to contribute to a better understanding of the prehistoric site Flyhov in the province of V?sterg?tland, Sweden and its immediate surroundings from an archaeological perspective. The site contains material artistic and ritual expressions from different prehistoric periods, and its long use-history (from the Stone Age until today) shows that the site, and its remains, has attracted the interest from people in prehistory, in modern times, as well as today. With a point of departure in perspectives derived from hermeneutics and phenomenology the essay examines the site?s prehistoric remains, the use of, and the interest directed towards, the site and its remains during different time- and use-horizons and how these horizons have been affected and intertwined with each other, in a manner where earlier material expressions have affected people and their new expressions.

This paper deals with variations in the osteological material of dog (Canis familiaris L.) from the Mesolithic Scania, southern Sweden. The general aim is to discuss the use and specialisation of dog during the period, and differences or relations between cultures and traditions within the Mesolithic period. The study is based on a analysis of the bone material from the sites; Ageröd I:A-D, Ageröd I:H-C, Bredasten, Bökeberg III, Hög, Löddesborg, Ringsjöholm, Segebro, Sjöholmen, Skateholm I-II and Tågerup, phase 1-3, with datings from Late Maglemose Culture to Early Ertebølle Culture. The seminar paper also includes descriptive statistics of the osteometrical data of Denmark, from several studies of Degerbøhl (1927) and Noe-Nygaard (1995, 2003). The study is focused on the relation between size, robusticity, muscle grooves and ligaments of mandibula, tibia, radius, humerus, femur and metacarpalia/metatarsalia.

The task was to design and manufacture a submersible displacement pump working with the wobble plate principle. The main task for the Wobble plate pump is to be used as a sewage pump for smaller households or dewatering pump in environments where small flows and high pressures are acquired. For these purposes ITT Flygt sell a screw pump, PC-Grinder 3068. The hydraulic part of the PC-Grinder is manufactured by a subcontractor. Therefore ITT Flygt wants to evaluate an alternative to their screwpump PC-Grinder, which can be entirely manufactured by them self.

Syftet med denna uppsats var att undersöka påståendet att ?basisten ska driva? i ett rock-/bluessammanhang, ett påstående de flesta basister inom genren nog har hört någon gång. I undersökningen spelade jag in en blues-shuffle i fem olika versioner med inspelningsprogrammet Cubase. I de olika versionerna varierades timing och betoningar i basen: i övrigt var de identiska. Inspelningarna användes i ett lyssningstest med en jury på sex personer, två professionella basister, två professionella musiker och två ickeprofessionella musiker.

Detta examensarbete har utförts på Ovako Bar i Hällefors i syfte att kontrollera möjligheterna att automatisera en slipningsprocess på stänger med ytdefekter. Det största skälet till arbetets uppkomst är de vibrationsskador som uppstår i operatörers händer vilket i sin tur leder till sjukskrivningar.Arbetet inleddes med en nulägesanalys på Kontrollstation 7 för att kontrollera hur processen går till, hur operatörerna upplever situationen och få en större förståelse för situationen. Information om nuvarande utrustning inhämtas i syfte att kunna utvärdera möjligheter. Kontakter med potentiella leverantörer togs också, i syfte att få ytterligare bollplank.Efter nulägesanalysen inleddes förbättringsförslagsprocessen. Lösningar till problemet uppkom ur brainstorming efter kravspecifikationen.

Detta examensarbete har genomförts vid LKAB:s anrikningsverk i Kiruna, där produktionssektion 24 har studerats. Denna sektion maler tillsatsmedel, som används vid tillverkningen av pellets. Projektets fokusering har legat på att ta fram konkreta förslag på förändringar som kan förbättra styrningen av produktionen, uppnå en jämnare produktkvalitet och en bättre arbetsmiljö för personalen. Projektet började med en grundläggande studie av nuläget, för att kunna identifiera de problem som finns idag. Metoder som användes till denna studie var arbetsstudier, intervjuer, kontroller av produktkvalitén och studie- och benchmarkingbesök.

There have been, in some rare cases, difficulties with clamping of inserts with U-holesin their tool holder. According to the complaints, the inserts could not be properlyclamped or could fracture when clamped. A study has shown that variations inclamping behaviour are mainly depending by the position of the screw hole in the toolholder and the centering of the screw hole in the insert.The focus of this project has been the centering of screw hole in insert. It has beenshown that the screw holes are not always enough centered in the insert. Theproblem may occur after a certain step in the production, i.e.

The study investigates the use of collection and treatment wagon for piglets in relation to castration. The importance of good and ergonomically designed tools in pig stables can probably reduce the risk of suffering from musculoskeletal disorders (MSD). During the last 20 years the number of pig farms has decreased and at the same time the herd sizes and the number of pig keepers have increased (Statistic Sweden (SCB) 2007). As a consequence, the pig keepers have more pigs to take care of, treat and neuter and spend more of their daily work in these large confinements. This also means that the repetitive work e.g.

There is an uncertainty in the market for grain forcing the meat/milk producers to review alternative feeds to a larger extent, in order to get control over the feed costs. This has led to that the meat/milk producers need to have a good knowledge regarding how the different feeds influences the animals and which technical equipment to use for handling. For those that produce their own feedmix, there is a need to put interest in new crops and their characteristics to be able to get the knowledge of what is required for their own production. It is beneficial to keep an open dialogue with advisors to be updated in new crops and new technology for feeding. When mixing feed at farm level, the legislation is not very clear since it the target group is large scale mixing plants. We have brought up the most important rules and regulations from the EU parliament Council as well as the ones from the Swedish Board of Agriculture (SJV), regarding feed mixing on farm and factory level. We have studied beans and pea at two different moisture levels, in order to evaluate how the moisture level affects the distribution of particles when milling with a plaitmill and a hammermill.

This master thesis investigates quality procedures and measuring of solid carbide end mills, with the main focus on measuring equipment. The thesis has been written in collaboration with a special production department for solid carbide end mills at Sandvik Coromant in Gimo. The department?s needs and constraints have been the foundation of the project and the main research question is: how to measure end mills in order to ensure good quality of the produced end mills. The project has contained both a theoretical study consisting of a literature review and practical studies in the workshop with the objective to identify an end mill?s main parameters and the relationship between an end mill?s geometry and the manufacturing processes.

På LKAB:s produktionsanläggning i Malmberget vill LKAB öka produktionskapaciteten med ca 20 % i anrikningsverket. Ett av flera alternativ för att uppnå en sådan kapacitetsökning är att installera en HPGR (High Pressure Grinding Roll) i en av Malmbergets sektioner. Tidigare studier av HPGR har visat på en möjlig kapacitetsökning samt en energibesparing. En försöksserie har genomförts för att undersöka hur väl Malmbergets malm (med interna specifika benämningen PAR) krossas i en HPGR samt om malmens malbarhet ökar. Testerna är genomförda på Hacettepe universitet i Ankara, Turkiet, med deras tryckutrustning anpassad för HPGR undersökningar.

Blast furnace is the heart of every steel plant. Steel production is based on the blast furnace process, as it is where the iron is extracted from the iron ore and turned into liquid iron, which will subsequently be used to make liquid steel. Therefore, without hot iron, steel can not be produced. Blast furnaces in this process are supplied among others with pulverized coal. Raw coal should be prepared for the blast furnaces in the form of fine coal powder.

In metabolism Mg plays an important role because it affects many cellular enzymes in the body. The energy metabolism and protein synthesis are dependent on Mg as an enzyme activator, Mg is also involved in the synthesis of RNA and DNA. Absorption of Mg primarily takes place over the ruminal epithelium in ruminants. The main storage of Mg is in the bones but that can only be reached if the cow is in great need of calcium or phosphorus, it's a hormonal regulated process that induces catabolism of bones. Free and available sources of Mg are found in soft tissues and in the extra cellular fluids that includes cerebrospinal fluids and blood.