Bike Hoist (35lbs max)

thingiverse

This is my Junior year machine design project for Chico State's Mechanical Engineering program. It's a bike hoist designed for limited space in an apartment or house to store bikes vertically with ease. The assembly is made mostly from Hatchbox PETG, except for a few pieces printed in Taulman 618 Nylon. This is an advanced printing project due to the materials used and the necessary pauses inserted into the GCode. I utilized a 0.6 mm nozzle for all prints except the nylon gears. *M3 washers may require epoxying to the ends of the two towers out back of FrameFront4, as the screw head surfaces might be missing; I apologize if you downloaded this before fixing the model and replacing it with FrameFront5.* [UPDATE] 10-09-2017: I posted the STL file for Frame Front5, so if you're downloading this after the update, you're good to go. Frame Front4 lacks small yet crucial features necessary for the two M3 body screws to function correctly. Wherever there's an M3 machine screw in this assembly shown in the photos (2 for body, 4 for motor mount, 4 for spool, and 4 for battery door), you must find the layer corresponding to the last open layer with the hexagon voids I created to insert M3 nuts mid-print. Creating pauses during printing is essential; insert the nuts by partially threading them onto a long screw and hitting them with a propane torch for two seconds to melt their way into the hole. Ensure the nuts are below the surface of the part or you might damage your brass nozzle. Notice that the renderings and photos have two pulleys top and bottom, whereas this model is designed for three pulleys top and bottom to increase mechanical advantage. Color switching can be done to make the arrows pop out on the front piece. This will require two more pauses at the exact right layer unless you're using a dual extruder. Printed Parts: 1X Frame Front#, Frame Back#, Batt Door, Ceil_Bracket, Hook2, Lower_Cablegide, motor bracket, spool#, top pulley holder - PETG # (#) indicates parts that require pauses to insert M3 nuts 6x single pulley - PETG 6X nylon bushing, nylon washer - Taulman 618 nylon 1x BigGear - Taulman 618 nylon 1x DriveGear - Taulman 618 nylon Hardware: 10x double battery terminals (Amazon stopped selling the ones I used; similar to these: http://a.co/jk0yA94) 1x DC female and male charge jack: http://a.co/7Yt8o51 1x Double momentary rocker switch: http://a.co/5i4lC7O 1x DC right angle gear motor: http://a.co/5WFvhQe 6x terminal connectors (small gauge) 8x 608zz bearings 10x rechargeable AA batteries 1x Battery charger: https://www.amazon.com/dp/B074P2RMYF/ Good luck, happy printing! And try not to make a mess with your epoxy! Please comment if you have questions and post your make if you accomplish this project! Chase