Printable Drive Train Module

thingiverse

This is a fully functional drive train module designed for 3D printing. Students often struggle with assembling robots, particularly the drive train, due to moving parts. To simplify this process, I created this module that requires only a few components per unit: 2 Case Halves 2 Case Clips (edit them for optimal fit) 4 Basic Axle Attachments (edit for clearance and precision) 2 Sprockets (ignore any modifications made) 1 Final Chain Loop 1 Chain Tensioner All parts can be printed on a 6" x 6" x 6" (156 mm x 156 mm x 156 mm) print bed without supports. Consistent bridging of 30 mm is necessary; some strands may need to be trimmed otherwise. Editing the axle attachments is essential for a functioning module. While this can be done using Blender or other software, the motor attachment cannot be predetermined due to varying motor sizes. However, the motor must be relatively strong. The clips don't require editing but might be easier with modifications. Editing can serve as a project subsection or be handled by a teacher for customized motor mounts. Instructions and pictures have been added on 8/18/16; apologies for the initial upside-down image. Assembly Step 1: Gather All Pieces Collect all required pieces, including any edited components. The number of pieces may vary depending on edits made. For a basic module like a demo print, the listed parts are sufficient. The necessary pieces include: Step 2: Insert First Axles and Sprockets Begin by assembling the first axles and sprockets. Combine one frame half with both sprockets. Choose two axles and slide them through the circular holes in the frame piece. Align the axles and sprockets to ensure a snug fit. If the axles don't stay in the sprocket, edit them for smaller clearance or reprint at higher speed and lower resolution. If they don't fit initially, print at higher resolution or edit for increased clearance. A frame half with two axles Step 3: Add Chain Circle the chain around the sprockets, ensuring it turns loosely throughout. The teeth of the sprockets work effectively in both slot and gap positions within the chain links. Step 4: Attach Second Case Half Place the second case half over the original, with both halves being mirror images except for the axles. Slide the clips onto each end; they should fit snugly. These clips will hold the halves together. Step 5: Add Final Axles and Chain Tensioner Look through the axle holes and align the d-shaft with the sprocket hole. With a bit of luck, it should pop in. Repeat this process for both axles. Next, slide the chain tensioner down over the top. The sprockets will turn slightly; don't hold them in place. The nubs on the tensioner arms should catch in the horizontal slot. If they don't, try moving the tensioner or trimming any intervening edges. Once it fits, congratulations – your module is complete!