Arrow Fletching and Nock Replacement

thingiverse

This model was made by a senior, Taylor Dottley, and a junior, Kristen Casey. They got the idea from the P.E. department, as archery arrows would break after use. Their teacher asked if it was possible to 3D model a replacement. After repeated renditions (approximately 25), they were able to the exact fit for the arrow shaft with everything the correct size. The arrows fire perfectly, unless you hit a tree. Print Settings Printer Brand: MakerBot Printer: MakerBot Replicator 2X Rafts: Yes Supports: No Notes: 2x: scale to 101.5% z18: scale to 102% How I Designed This We started with a blank Inventor Pro template and calipers. It was very hard to know where to start, especially since arrows have been the same for so long. First we tried to size how large the original cylinder that goes around the arrow shaft should be. After we perfected that we started trying to attach the individually modeled feathers to the cylinder. Inventor was very resistant to us connecting the flat face of the arrows to the curved cylinder. After a few days of trying to attach the feathers tangent to the shaft, we started trying to build the three arrows off the cylinder instead of trying to attach it directly. Using the polygon tool, we built a series of triangles and then modeled the feathers off of a created face. We built the nock end separate and then attached it to the design using the compilation tools of Inventor. We then had to rotate the nock so the arrow would properly fire from an archery bow. Custom Section o Objectives: To 3D print, attach, and then fire an arrow with the 3D printed model acting as the arrow fletching and nock. o Audiences: Any age that can understand 3D modeling and archery safety precautions. Our specific audience is our high school physical education class. o Preparation: The arrow shaft should be cleaned before putting the 3D printed piece on the shaft. The nock should be removed as well as the fletching from the original arrow. o Steps! It is easiest to first saw through the arrow to remove the nock, and then to remove the arrow fletching with an exacto knife. The printed piece should slide on and off with a normal amount of strength without coming off when fired from the bow. o Results: By the end of it you should have a fully functioning arrow that can be fired. Our tests indicate that this replacement part will last at least 70 fires without issue. Do be cautious to hit your target as harder surfaces can break the part (such as hitting a tree or wall).