Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Mechanical Engineering
Freehub Test Machine, Brett Murphy, Mitch Ambrosini, Nick Boldt, Stephen Knaus
Freehub Test Machine, Brett Murphy, Mitch Ambrosini, Nick Boldt, Stephen Knaus
Mechanical Engineering
The purpose of this project is to design and build a machine to test a bicycle freehub in a lab environment. The conditions need to imitate the forces experienced by a bike wheel in a repeatable fashion. To do this we designed a machine that can fatigue the freehub in two distinct modes, pedaling and freewheeling. In the pedaling mode the freehub will be repeatable torqued to find how many engagement cycles freehub can endure before failure. The freewheeling test will spin the freehub in its coasting direction to find how the freehub wears during its lifetime. A freehub is …
Formula Sae Hybrid Carbon Fiber Monocoque / Steel Tube Frame Chassis, Matthew Hagan, John Rappolt, John Waldrop
Formula Sae Hybrid Carbon Fiber Monocoque / Steel Tube Frame Chassis, Matthew Hagan, John Rappolt, John Waldrop
Mechanical Engineering
The Cal Poly Formula SAE Team created this project in order to design and fabricate a high-performance chassis which would be competitive at 2013 FSAE Lincoln, and to document the process so that future teams could more easily create a chassis. One of the main goals was to reduce weight from the 143- lb 2012 chassis subsystem. A weight of 95 lb was achieved, with 82 lb in the chassis structure itself and a predicted torsional stiffness of 1700 lb*ft/deg. Composite materials design and manufacturing techniques were developed during the project. Design, testing, and manufacturing processes are detailed, and results …