Nelson Traveling Sprinkler Parts

thingiverse

We have a Nelson Traveling Sprinkler that got hung up and stripped the final drive gear. We could've bought a full gear set from Nelson, but it costs $30! So whats a person with calipers and a 3d printer to do? Reverse engineer it, of course! There are three versions of this gear uploaded. The "correct" gear is the .45 inch version. On my printer all the dimensions, except the center hole, were printing correctly so I made a .47 inch version since they were consistently printing at .43 inches. This one slipped right on to the shaft. I've included .46 inches just in case. I've marked this as a work in progress since I'll be adding more gears as I'm able to model them. Edit 8-16-16: I was requested to model the shutoff platform that attaches to the hose. I've uploaded the platform, and a ground stake. I didn't intend for the stake to actually be printed, but I included it just in case somebody wanted to try. The hole I included for a stake was designed to allow a hot nail to be melted into the platform. The cross design should allow plastic to flow over the head of a nail to capture it in the part. Since the platform just barely fits on the build plate of my printer (and I don't need one) I'm not going to print one. Please post a make if you do make one. I'd like to see if it works. If it doesn't I will make changes. https://youtu.be/k6nKQTk2MIQ Edit 6-16-18: Added a replacement front wheel. For ease of printing the wheel doesn't include any of the knobs that the original has. It shouldn't be necessary since it's just being used to track a hose. Print two and replace both pieces, even if one isn't broken. It's not designed to be a direct replacement. Print Settings Printer: Flashforge Dreamer Rafts: No Supports: Yes Resolution: .3mm Infill: 50% Notes: Printed in MakerGeeks Yellow PETG. Be sure your supports extend beyond the edge of the gear teeth. ABS should be strong enough. Normal PLA might be too brittle. A premium PLA would probably be better if that's all you can use. Edit 8-16-16: Since I installed this gear the PETG has stripped out. I think it's a combination of the sprinkler getting hung up again, and the PETG having a shear strength lower than the factory nylon gears. I've ordered some Taulman Alloy 910 to reprint the gear. Hopefully the Alloy 910 will hold up a little better.