The CB-hand
(2018) In CODEN:LUTEDX/TEIE EIEM01 20182Industrial Electrical Engineering and Automation
- Abstract
- The purpose of the thesis was to design and build an externally powered prosthetic hand. The hand should preferably have one or more new functionalities not found in other prostheses. The human hand is very complex, it contains over 30 muscles and at least 18 joints. In comparison, a complex and dexterous commercial prostheses has five actuators and eleven joints, but only one or two control signals. All in all making it essentially impossible to replace the human hand with an equal prosthesis.
The concepts was developed after literature study and interviews. The concept was 3D printed, tested, evaluated and improved in cycles until a final prototype could be constructed and manufactured. The final prototype was mainly 3D-printed in... (More) - The purpose of the thesis was to design and build an externally powered prosthetic hand. The hand should preferably have one or more new functionalities not found in other prostheses. The human hand is very complex, it contains over 30 muscles and at least 18 joints. In comparison, a complex and dexterous commercial prostheses has five actuators and eleven joints, but only one or two control signals. All in all making it essentially impossible to replace the human hand with an equal prosthesis.
The concepts was developed after literature study and interviews. The concept was 3D printed, tested, evaluated and improved in cycles until a final prototype could be constructed and manufactured. The final prototype was mainly 3D-printed in plastic because of the design, quickness and viability; the design made it hard to manufacture in any other way. The exceptions are the gears, motors and shafts which were bought from suppliers.
In the end, the assembly of the final prototype did not go as well as expected. The reason was mainly the accuracy and the fitting of the gears to the shafts; the accuracy of the measurements in the parts was not high enough, and the gears came loose.Thus, it is very hard to draw any conclusions about the design from it. What can be seen is that the idea of the design seems to work but requires some reworking. Finally, to get some real answers about its viability, it needs to be tested with a prototype of better build quality. (Less) - Abstract (Swedish)
- Syftet med detta arbete var att designa och bygga en externt driven proteshand. Handen ska helst ha en eller flera funktioner som inte finns hos andra protester. Den mänskliga handen är väldigt komplex, den innehåller över 30 muskler och minst 18 leder. Jämförelsevis har en komplex och rörlig kommersiell protes fem aktuatorer och elva leder, men endast en eller två kontrollsignaler. Allt som allt gör detta det i princip omöjligt att ersätta en mänsklig hand med en lika bra protes.
Koncepten fram togs efter litteraturstudie och intervjuer. Det valda konceptet 3D-printades i plast, testades, utvärderades och förbättrades i cykler till en slutgiltig prototyp kunde konstrueras och tillverkas. Prototypen var huvudsakligen 3D-printad i plast... (More) - Syftet med detta arbete var att designa och bygga en externt driven proteshand. Handen ska helst ha en eller flera funktioner som inte finns hos andra protester. Den mänskliga handen är väldigt komplex, den innehåller över 30 muskler och minst 18 leder. Jämförelsevis har en komplex och rörlig kommersiell protes fem aktuatorer och elva leder, men endast en eller två kontrollsignaler. Allt som allt gör detta det i princip omöjligt att ersätta en mänsklig hand med en lika bra protes.
Koncepten fram togs efter litteraturstudie och intervjuer. Det valda konceptet 3D-printades i plast, testades, utvärderades och förbättrades i cykler till en slutgiltig prototyp kunde konstrueras och tillverkas. Prototypen var huvudsakligen 3D-printad i plast på grund av designen samt snabbheten och lättillgängligheten i att 3D-printa; designen var för komplex för att på ett smidigt sätt tillverkas på något annat sätt. Det ända som inte var printat var motorerna, kugghjulen och axlarna, vilket köptes av leverantörer.
I slutändan gick konstruktionen av den slutgiltiga prototypen inte så bra som förväntats. Anledningen var huvudsakligen att noggrannheten på tillverkningen var för dålig samt problem med att fästa kugghjulen på axlarna; måtten på de tillverkade delarna var inte noggranna nog, och kugghjulen lossnade. På grund av detta, är det väldigt svårt att dra några slutsatser om designen. Den slutsats som kan dras är att det ser ut som om designen fungerar, men det är möjligt att det kommer krävas lite omarbete. För att dra några definitiva slutsatser om hur väl designen faktiskt fungerar, krävs en slutgiltig prototyp som är mer välbyggd (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8964010
- author
- Blomstrand, Daniel LU and Skarrie, Erik
- supervisor
- organization
- alternative title
- A study of the functions and development of modern prosthetic hand
- course
- EIEM01 20182
- year
- 2018
- type
- H3 - Professional qualifications (4 Years - )
- subject
- publication/series
- CODEN:LUTEDX/TEIE
- report number
- 5413
- language
- English
- id
- 8964010
- date added to LUP
- 2019-03-29 13:28:04
- date last changed
- 2019-03-29 13:28:04
@misc{8964010,
abstract = {{The purpose of the thesis was to design and build an externally powered prosthetic hand. The hand should preferably have one or more new functionalities not found in other prostheses. The human hand is very complex, it contains over 30 muscles and at least 18 joints. In comparison, a complex and dexterous commercial prostheses has five actuators and eleven joints, but only one or two control signals. All in all making it essentially impossible to replace the human hand with an equal prosthesis.
The concepts was developed after literature study and interviews. The concept was 3D printed, tested, evaluated and improved in cycles until a final prototype could be constructed and manufactured. The final prototype was mainly 3D-printed in plastic because of the design, quickness and viability; the design made it hard to manufacture in any other way. The exceptions are the gears, motors and shafts which were bought from suppliers.
In the end, the assembly of the final prototype did not go as well as expected. The reason was mainly the accuracy and the fitting of the gears to the shafts; the accuracy of the measurements in the parts was not high enough, and the gears came loose.Thus, it is very hard to draw any conclusions about the design from it. What can be seen is that the idea of the design seems to work but requires some reworking. Finally, to get some real answers about its viability, it needs to be tested with a prototype of better build quality.}},
author = {{Blomstrand, Daniel and Skarrie, Erik}},
language = {{eng}},
note = {{Student Paper}},
series = {{CODEN:LUTEDX/TEIE}},
title = {{The CB-hand}},
year = {{2018}},
}