1. Introduction A wildland firefighter is a valuable resource to protecting public lands and managing fuels. The many hand tools used by firefighters aid in their ability to complete any required tasks effectively. Several of the tools available are specially purposed for individually grubbing, scraping, or liming. A small squad of firefighters could become a more effective resource if the tools they carried could perform several of these purposes as one single tool. To improve the effectiveness of an individual on the fireline, a multi- use hand tool was designed to include an axe for liming and a heavy duty scraper for grubbing and scraping simultaneously. Materials and Methods The design and construction of the tool were first directed by the design requirements. Important Design Requirements -Tool weight is less than 8lbs. -Tool head must fit in 10”x12”x8” box. -Tool hardness must be 50-60 HRC. -Scraping tool must remove at least 15 in³ of soil. -Tool must not fail to bending or shear stress after loading 5olbs. Analysis was focused on impact forces, stresses in the tool head, and material properties. These topics determined the minimum dimensions and material selection for this device. Construction Method When planning the construction of the tool, it was important to use the available resources found in the MET department and apply the fabrication skills obtained. Some of these include: -SolidWorks 3D Modeling Software -CNC Plasma Table -CNC Milltronics 3-axis Milling Machine -TIG Welding Acknowledgments The following staff and classmates made the completion of this new tool possible, Thank You. Prof. Charles Pringle Mr. Ted Bramble Trevor Reher Mr. Matt Burvee Zach Uhrich Manufacturing Results The final constructed device was an overall success as a functional multi-use hand tool. The device met the design requirements and was completed well within budget. During the machining process issues occurred due to the size of the tooling required and the hardness of the AISI 4140 steel. More expensive carbide tooling was used to mitigate these issues. Figure 1: Scraper Manufacturing Figure 2: Axe Manufacturing Figure 3: Completed Multi-Use Hand Tool Testing Methods The testing portion of this project was Dimensional Results distributed into five sections. All the dimensions of the final tool passed -Dimensional Testing the required values. -Soil Volume Removal -Material Hardness -Static & Dynamic Loads -Functional Field Test Static & Dynamic Loading The point of the tool most likely to fail due to loading is at the base of the scraper tool near the weld. During the design and testing, a predicted stress Figure 4: Static Load Testing w/ Strain Gauge was calculated for loads up to 60 lbs. Conclusions The success of this project was based on how the final tool would perform common fireline duties when compared to the standard Pulaski. The field testing required 5ft of line to be constructed and compared. The success value was determined by the # of swings, time, and quality of the line. After comparison, the new Multi-use tool achieved a 1.5x better success value. The final constructed device allows an individual firefighter to be a more effective resource. This tool provides the soil removing capabilities of a Rhino scraping tool as well as the liming and ridged grubbing abilities of the Pulaski. Bruce Wayne Bernard Jr Mechanical Engineering Technologies Central Washington University Ellensburg, WA 98926 Literature Cited Hibbeler, R.C.. Engineering Mechanics Dynamics. 13 th ed. New Jersey: Pearson Prentice Hall, 2013. Print. Hibbeler, R.C.. Statics & Mechanics of Materials. 4 th ed. New Jersey: Pearson Prentice Hall, 2014. Print. “AISI 4140 Steel, oil quenched.” MatWeb, LLC. MatWeb. Web. 10 November 2015. Mott, Robert L. Machine Elements in Mechanical Design. 5 th ed. New Jersey: Person, Inc, 2014. Print. Additional Project Information For more information and final project report, visit the project webpage at http://bernardb3.wix.com/cwusenior. Multi-Use Fireline Hand Tool