CNH Tractor Attachment Chris Beadle, Chris Hewitt, Doug Stewart, Jamieson Weiss Overview Concept Generation Final Design Background Information Design Process Solid Model CNH (Case New Holland) is one of the largest global industrial and tractor companies. They are looking for a better way to move certain pieces of equipment around their facility, including on both their shop and farm. The key idea of this project is to be able to have multiple attachments on the tractor and not to have to leave them out on the farm when not in use. 1st Generation Rejected due to machinability, strength concerns. 2nd Generation Rejected due to long operation time. 3rd Generation Rejected due to machining costs. The Product The design should pick up hay with bale spears as well as shop equipment with pallet forks, should tow attachments such as a baler using a draw bar, and should attach smaller devices which use the same two-point hitch system that our device would connect to. Our solution seeks to combine spears, forks, a draw bar, and a two-point hitch into a single, all-encompassing device able to perform a variety of tasks. Project Scope Design and build a device to store and utilize bail spears and forks, enable usage of a two-point hitch, and allow access to a drawbar for use on category two tractors with three-point link hitch systems in-house at CNH. It should be operable by a single user, comply with existing requirements, and not impede normal usage of the machine. Half-Circle Base Square Base Shroud Mechanism Manufacturing Throughout the design process, the concept was built with manufacturing in mind. Mild steel was used as the primary material, and at CNH’s request many of the components were designed to be quickly and inexpensively cut on CNH’s laser cutter and welded in their machine shop. Front Testing Plan Thanks to CNH, we were able to use a New Holland tractor to test our concept. Some metrics required only static measurements, for instance lateral adjustability and the distance from the spears to the ground. Others, like installation time and operation time, required simulating normal and abnormal usage conditions. Metrics Metrics Lift Capacity Installation Time Lateral Spear Adjust Lateral Fork Adjust No. of Bale Spears Weight Cost Operation Time Loose Parts Constraints 5,000 lbs 2 min 3 in 7-36 in 3 500 lbs $3,000 2 min 0 Right Validation Our primary method of validation prior to prototyping was fullassembly FEA analysis. We validated our concept by testing the model in a multitude of worst-case scenarios. Other metrics were tested as described above and meet acceptable target values. Acknowledgements We would like to thank our sponsors at CNH, Doug Fitzkee, Kevin Smith, and Chris Foster, our advisor Dr. Glancey, and the rest of the Senior Design Staff.