This master thesis was conducted during the spring of 2014 at Atlas Copco Rock Drills AB in Örebro. The purpose of the thesis was to develop a simulation model of the rotation system for a hydraulic rock Drill. In the future, the model will be used to investigate the phenomena called ?jerky rotation?. In order to validate the simulation model a test bench was designed and tests were made.

A study was carried in conjunction with the Orthodontic department at Halmstad General Hospital in Sweden to investigate the possibility of reducing cost and manufacture time of dental implant Drill guides. The current system involves sending a digital image in STL format to the Materialise factory in Belgium where information of the position of dental implants is translated onto a moulded mouthpiece. Drill guides are placed in the mouth piece which is then returned to the surgeon. The mouthpiece complete with Drill guides is then placed in the patients mouth and used as a guide for the implant Drill holes. The cost of 10000 sek and a turnaround time of 2 weeks gave rise to the need for a faster and cheaper solution.

The aim with this study was to investigate the effects a change of manufacturing process would have on the mechanical properties of Drill bits made of a WC/Co composite used for stone cutting. The method used today is sintering, where the material is heated in a conventional sintering oven. The other method was microwave sintering, where the material is heated by radiation in the microwave region. Also an investigation of the manufacturing cost were made.The main difference between the two heating methods is that the conventional way is a rather slow process and the microwave method is very fast. The material is also heated homogeniously in the method with mirowaves, aposed to the case with the conventional sintering where the material is heated from the outside in.This makes the material harder and more wear resistent.

Syfte och frågeställningarSyftet var att undersöka frekvensstegen som träningsmetod för fotbollsspelare i avsikt att öka snabbhet i vändningar och agility då dessa förmågor är mycket viktiga för en spelare under en fotbollsmatch.Frågeställningar:Ökar träning med frekvensstege spelarnas agility?Förbättrar träning med frekvensstege spelarnas förmåga att ändra riktning i hög hastighet?MetodFör att besvara frågeställningarna valdes en experimentell, kvantitativ studie med Test-Retest som insamlingsmetod. I studien deltog både en försöksgrupp och en kontrollgrupp. Försöksgruppen var ett damfotbollslag, ålder 18.8±1.9  år och de var 12 deltagare. Kontrollgruppen var ett damfotbollslag, ålder 17.8±0.8 och var 6 deltagare.Undersökningen pågick under 7 veckor och vid totalt 12 tillfällen.

The use of combi-Drilling during spring tillage has become very common in southern Sweden in recent years. Combi-Drilling leads to fewer passes on the field and better plant nutrient utilisation. An example of a combi-Drill is the Väderstad Rapid, which is very widely used in spring tillage in southern Sweden. The Rapid has separate fertiliser and seed coulters, which means that the draught requirement is relatively high. It thus requires large, heavy tractors, which compact the soil and are comparatively expensive to buy and run. A few years ago the Finnish combi-Drill Tume Nova Combi came onto the Swedish market.

In the assembly process of airframe structures there are many Drilled holes and on some parts the holes are mainly Drilled manually with pneumatic handheld Drilling machines. During conventional Drilling in metal, burrs appear. To remove these burrs the parts of the structure must be separated and deburred before they can be put together for fastening. This is a time consuming measure and therefore expensive. To facilitate this process and lower production costs some parts of the process needs to be automated.A part of this thesis was a project in co-operation with Saab, Novator, Specma Automation and the University of Linköping.

In this thesis tests has been performed on the pull strength of screws glued into glulam beams.The experiment is based on the already approved method whereby the diameter of the Drilled holes is the same as the screw outer diameter of 1 mm or bigger. The screws strength class shall not be less than 4.6 (EN ISO 898-1:1999, 1999).The difference in the experiments that were performed where that the Drilled diameter were 1 mm smaller than the outer diameter of the screw so that the screw thread was worked into the wood.In the tests the gluing where made on M8 glulam beams. The screws where Drilled at and angel of 90°tangental to the fiber direction with a diameter of 7 mm. The gluing of the screws where made in three different depths and where later exposed to pulling forces. The results showed both pulling breaks and screw breaks when they reached their maximum capacity.

Mozarts fagottkonsert är ett oerhört viktigt stycke i fagottrepertoaren. Vad behöver jag veta för att kunna bilda mig en egen uppfattning om konserten? Hur spelades den då den skrevs? Hur vill jag tolka den och var hittar jag informationen som ger mig kunskap om mina olika valmöjligheter? Denna uppsats är ett försök att visa hur man på en modern fagott kan framföra Mozarts fagottkonsert på ett informerat sätt med hjälp av den kunskap som finns att tillgå..

The county administration asked LKAB to make an inventory of possibly contaminated sites caused by their mining activity. The inventory should be performed according to the MIFO model, a method from SEPA which is used to assess a contaminated site. The first phase involves collection of information through interviews and site inspections and in phase 2 a general survey with field sampling is conducted.LKAB started the work with the first phase of the survey during 2003. During this project the information collected in Phase 1 was evaluated and 16 of the sites were chosen to proceed to MIFO Phase 2 (six sites in Kiruna, and 5 sites respectively in Svappavaara and Malmberget). The sampling of these 16 sites was performed during week 27 2004.

The county administration asked LKAB to make an inventory of possibly contaminated sites caused by their mining activity. The inventory should be performed according to the MIFO model, a method from SEPA which is used to assess a contaminated site. The first phase involves collection of information through interviews and site inspections and in phase 2 a general survey with field sampling is conducted. LKAB started the work with the first phase of the survey during 2003. During this project the information collected in Phase 1 was evaluated and 16 of the sites were chosen to proceed to MIFO Phase 2 (six sites in Kiruna, and 5 sites respectively in Svappavaara and Malmberget). The sampling of these 16 sites was performed during week 27 2004.

The primary goal of this study was to investigate how the radial growth of retained trees responds after thinning-from-above. The National Board of Forestry which initiated this study, was interested in whether there were differences in the growth-response between the tree species Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.). Another question of issue was if there were differences in the growth response between trees of different sizes. It is within the framework of the National Board of Forestry?s, Continuous Forests Project that these urgent questions are to be answered.

In today's agriculture efficiency and the capacity of tools and machinery are crucial. In this work we investigate whether it is possible to enhance the capacity of sowing by increasing the work speed of seeders, how seed technology affects seed placement, and if there is any difference between two different brands of seeders and their sow techniques. The seeders we have chosen to compare are Väderstad Rapid Drill and Amazon Cirrus Drill. The tillage capacity of the seeders and their traction power needs were examined as well.Väderstad Rapid and Amazon Cirrus were tested in a randomized block design with four replicates at three different speeds, 8 km/h, 12 km/h and 15 km/h. The seed placement at the different speeds was examined by dividing the seedbed into four different zones from its surface to its bottom.

Syftet med detta examensarbete var att undersöka praktiskt kontra formellt arbetssätt i matematikundervisningen på högstadiet. Den praktiska undervisningen är en undervisningsform som bottnar i det sociokulturella perspektivet, där kunskap föds genom den kommunikativa processen. Den formella undervisningen med ursprung i Associationismen fokuserar däremot på Drill och övning. Meningen var att undersöka vilka effekter praktisk respektive formell undervisning får resultatmässigt och hur de olika arbetsformerna uppfattades av eleverna. Undersökningen genomfördes i en årskurs sex och en årskurs sju med sammanlagt trettio elever. För att undersöka mina frågeställningar genomförde eleverna tre olika prov inom statistikområdet och besvarade en enkät.

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Detta projekt återspeglar åsikten att det finns stora vinster att göra när redan nu väl etablerad teknik vidareutvecklas, förfinas, och rationaliseras med hjälp av datorisering. Denna rapport summerar bakgrund, arbete och slutresultat för ett projekt där denna filosofi har legat till grund för att erbjuda ett företag strategiska marknadsfördelar inom en redan väl etablerat verksamhet ? Borrning av djupa hål i berggrunden. Projektet Borr IT tar verksamheten ett steg vidare genom att erbjuda visualisering av borrprojekt med hjälp av 3-dimensionell datorgrafik. This project reflects the opinion that there are large profits to be made when existing technology evolves, is refined and becomes rationalized by means of computerization.