pic: Bit Buckets 2015 Offseason Drivetrain

[z_beeblebrox]

Originally Posted by fb39ca4

Is your chassis held together entirely with T-slots? We thought those would not be strong enough, so we use wood glue for everything. It probably helps that you are using 1/4" plywood, rather than 3/16".

Everything is held together with t-slots.

Originally Posted by asid61

How small is "a hair smaller" for wood?

We've experimentally found that cutting the bearing holes .006" undersize compensates for kerf and gives a pretty tight fit. I imagine that this number varies with laser model and material.

[asid61]

Originally Posted by z_beeblebrox

Everything is held together with t-slots.



We've experimentally found that cutting the bearing holes .006" undersize compensates for kerf and gives a pretty tight fit. I imagine that this number varies with laser model and material.

Thank you, I will file that away for when we use wood.

[z_beeblebrox]

Here's the next version of the drivetrain. It maintains the same general design as the last iteration, but the CAD model has been completely redone. It is now better organized and entirely equation driven- the length, width, height and other properties can all be adjusted by changing numbers in a text file.

This model is not intended to be cut out as-is. It's intended as a base that a team can quickly and easily adapt to any game, changing the size, wheels, gearbox or anything else. As such, the gearbox mounting, which is intended as an example, is not equation-driven and the model includes no lightening or access holes, wheels or axles.

The electronics layout is also not a final design - it is simply a demonstration of how SolidWorks' blocks can be used to quickly draw an electronics board.



The gearbox included in the model is a repackaged Vex Pro Ball Shifter. Its only custom parts are the 4 wooden enclosure pieces.

SolidWorks files are available on GrabCAD here. Look in the folder "2015 Offseason Drivetrain v2 Upload".