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Stark, starkare, starkast: en jämförelse av fasta tappar och centrumtappar med utgångspunkt i tappens dimensioner, inpassning, komprimering, antal och limning
Linköping University, Department of Management and Engineering, Malmstens Linköping University.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesisAlternative title
Optimizing the stability : an investigation of tenon and dowel joints regarding their dimensions, fitting, compression, number and glueing (English)
Abstract [sv]

I mitt examensarbete jämför jag styrkan för sammanfogningar i trämöbler med fasta tappar och centrumtappar utifrån fem parametrar: tappens dimensioner, tappens inpassning, tappens komprimering, tappens antal och tappens limning. Den övergripande frågan har varit, ”är fasta tappar eller centrumtappar starkast?” Målet har varit att sålla i olika teorier rörande dessa två typer av sammanfogningar och skapa ett underlag i syfte att hjälpa möbelsnickare och formgivare att kunna ta medvetna beslut vad gäller sina val av dessa typer av sammanfogningar. Genom litteraturstudier och verkstads besök har jag samlat kunskap som ligger till grund för det hållfasthets test jag sedan gjort i materiallabbet på Linköpings universitet. Testet har utgått från ett scenario där en stols bakben ska fogas samman med en sarg. Testet visar, utifrån ett antal angivna avgränsningar, att fasta tappar utan undantag är starkare än centrumtappar.Det visar också att en dubbel fast tapp fördelar belastningen bättre än en enkel fast tapp och bidrar till en betydligt starkare fog. För c-tappar gäller generellt att ökat antal tappar ökar fogens seghet men inte nödvändigtvis maxbelastningen. Inpassning och komprimering har betydelse för hur seg en fog är.

Abstract [en]

I have in my thesis compared the strength of mortise and tenon joints and dowel joints in wooden furniture. I´ve made the comparison based on five parameters: the dimensions of the tenon or dowel, the fit of the tenon or dowel, the compression of the tenon or dowel, the number of tenons or dowels and the gluing of the tenon or dowel. The bigger question has been, “is the mortise and tenon joint or the dowel joint the strongest?” The goal has been to go through different theories regarding these two types of joinery and making a foundation to help cabinet makers and designers to make conscious decisions regarding their choices of these two types of joinery. Through studies of literature and visiting workshops I´ve gathered knowledge that lies as a foundation for a test of strength of different joinery made in the material testing facility of Linköping University. The test was based on a scenario of joining the back leg and side rim of a chair. The test shows, from the given definitions, that mortise and tenon joints are without exceptions stronger than dowel joints. It also shows that double tenons better will distribute the load and make for a stronger and tougher joint. Dowel joints will get tougher with an increased number of dowels but it will not necessarily make for a stronger joint. The fit and compression of the tenon or dowel will affect the joints strength.

Place, publisher, year, edition, pages
2018. , p. 63
Keywords [en]
cabinet making, joint, wood, mortise and tenon, dovel joint, glueing, fitting, compression
Keywords [sv]
möbelsnickeri, träförband, trämöbelförband, sammanfognigar, tapp och kista, centrumtapp, limning, komprimering, inpassning
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:liu:diva-152652ISRN: LIU-IEI-TEK-G--18/01493--SEOAI: oai:DiVA.org:liu-152652DiVA, id: diva2:1262151
Subject / course
Bachelor Degree in Cabinetmaking
Presentation
2018-06-04, Malmstens, Larsbergsvägen 8, Lidingö, 13:15 (Swedish)
Supervisors
Examiners
Available from: 2018-11-13 Created: 2018-11-09 Last updated: 2018-11-13Bibliographically approved

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