Manufacturing Mountain Bike

Topics: Bicycle, Crankset, Bottom bracket Pages: 34 (10977 words) Published: October 10, 2012
1.0 Introduction 1
2.1 Introduction & History of Mountain Bike 1 2.2 Function of The Component / Product 3
2.3 Assumption on The Type of Manufacturing Method 4 and Quantity of Production

2.0 Detailed Specification of The Final Product 7 3.4 Material Selection 7
3.5 Component Analysis 8
3.6 Dimensional, Surface etc Specification 9
3.7 Technical Drawing 11

3.0 Stages of The Processes 14
4.8 Crank Arm with Spider 14
4.9.1 Process 1 14
4.9.2 Process 2 16
4.9.3 Process 3 19
4.9 Chain Ring 21
4.10.4 Process 1 21
4.10.5 Process 2 24
4.10 Type of Processes Selected 27
4.11.6 Casting 27
4.11.7 Forging 29
4.11.8 Rolling 30
4.11.9 Drilling 32
4.11.10 Anodizing 33

4.0 Type of Machines / Equipment For Each Process 35

5.0 Conclusion 42

6.0 References 43

For the subject SME2713 Manufacturing Process, we have been assigned to do a group assignment for the parts of a mountain bike. The main objectives of this group assignment are to train students in acquiring and organizing information. Besides that, it is also set for the purpose of training students in technical report writing and working in a team. Other than that, this group assignment also helps the students to improve the knowledge and understanding with regards to the field of study. The part of a mountain bike that our group assigned is the crankset.

A mountain bike or mountain bicycle (abbreviated MTB) is a bicycle created for off-road cycling. This activity includes traversing of rocks and washouts, and steep declines, on dirt trails, logging roads, and other unpaved environments—activities usually called mountain biking. These bicycles need to be able to withstand the stresses of off-road use with obstacles such as logs and rocks. Most mountain bikes use wheels with rims which are 559mm in ISO sizing, one of the sizes colloquially referred to as "26-inch". Wheels used on mountain bikes usually use wide, knobby tires for good traction on uneven terrain and shock absorption. Since the mid-1990s, front wheel suspension has become the norm and since the late 1990s, full front and rear suspension has become increasingly common. Some mountain bikes are also fitted with bar ends on the handlebars to give extra leverage for hill-climbing. Since the development of the sport in the 1970s many new subtypes of mountain biking have developed, such as cross-country (XC) biking, all-day endurance biking, Freeride-biking, downhill mountain biking, and a variety of track and slalom competitions. Each of these place different demands on the bike requiring different designs for optimal performance. MTB development has included an increase in gearing, up to 30 speeds, to facilitate both climbing and rapid descents. However, recently the "1 by 10" trend has emerged, simplifying the gearing to one sprocket in the front and 10 in the rear of the drive train. This allows for lighter component weights while still maintaining a large spread of gearing options. Other developments include disc instead of rim brakes. A recent production is the SKYVER, a type of downhill bike scooter. As far back as 1490, Leonardo da Vinci had envisioned a machine remarkably similar to the modern bicycle. Unfortunately, da Vinci did not attempt to build the vehicle, nor were his sketches discovered until the 1960s. In the late 1700s a Frenchman named Comte de Sivrac invented the Celerifere, a crude wooden hobby horse made of two wheels and...
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