Preliminary Project Proposal
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Preliminary Project Proposal
Project Title
: Machine Design Course Project
Date:
October 04, 2022
Project Type:
Skateboard Bearing Efficiency
Problem Statement:
Group three will focus on the efficiency and tolerance associated with commonly produced
bearings used in skateboards. Our group proposes better alternative techniques to manufacture a
better rolling bearing then what is utilized now. The goal is to explore the pros and cons
associated with the changes that can be made to improve the current design. Rather than
analyzing the entire skateboard and truck assembly, we will focus our attention solely on the
forces associated with the rotational movement of the skateboard bearings, creating contents in
exterior forces that will allow the group to test multiple avenues of improvement. The overall
goal of our research is to see if there are any readily easy ways to improve on the simple design
of a bearing, while weighing all the associated reactions of this design change, such as cost of
manufacturing, or tolerance of materials used.
Background Information:
All bearings that are manufactured currently follow a strict guideline that measures their quality
control, as well as performance when applied to exterior systems, like a skateboard. These
guidelines are defined as the ABEC standard ratings, and we will use these ratings to be the basis
for our factor of safety when testing our theories for improvement. We will be focusing on the
standard
Max RPM 608-ZZ ABEC1 (1.0)
bearing from the ABEC scale, as this size is the most
commonly used, and least efficiently rated bearing in skateboards manufactured today.
Project Description:
To analyze our test theories, we will look upon lecture material learned in class, as well as
outside sources and articles to drive the mathematical analysis of our design improvement. We're
focusing primarily on the friction force associated on the bearing when a constant load is applied,
and how this frictional force affects the speed to which the bearing can rotate on the assembly of
a skateboard truck. Most of the analysis for this project will be done by hand, or through the
assistance of programs such as MatLab, and the design portion will be represented by models
created using SolidWorks. SolidWorks simulation will also bring important information and
values as we study how the bearing reacts in different materials and designs.
Needs Assessment:
Once we have gained some insight to the possible improvements that can be made, we will
model and analyze two different bearing designs, and compare them side-by-side to the standards
and tolerances associated with the standard control bearing.
One potential solution we’re going to study is the change from traditional steel ball bearings to
steel cylindrical roller bearings. The idea behind changing the bearing type is that, although we
might encounter an increased cost of production, there will be a notable difference in engineering
properties such as a higher max load and a lower coefficient of friction. We will be able to loosen
tolerance requirements since this bearing type doesn’t require such tight tolerances in order to
over perform, thus decreasing production cost according to our needs. In addition to the steel
cylindrical roller bearings, we propose that changing the design from steel ball to ceramic ball
bearings might give us the improvement in efficiency that we are looking for. Our group will
explore the mathematical benefits and flaws to these two design improvements, and compare the
results with that of our control bearing represented by the Max RPM 608-ZZ ABEC1 (1.0) as
mentioned before.
Outside sources used for this projects research and method of standardization:
-
https://koyo.jtekt.co.jp/en/support/bearing-knowledge/8-4000.html
-
https://www.ahrinternational.com/Skateboard_bearings.htm
-
https://www.liveabout.com/abec-bearings-ratings-3002421
-
https://insights.globalspec.com/article/10809/bearing-tolerances-explained
-
https://downhill254.com/skateboard-longboard-bearings-guide/
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