pic: Bit Buckets 2015 Offseason Drivetrain

[asid61]

Originally Posted by fb39ca4

We've never done wood gearboxes, but bearing press fits work fine, you just have to make the hole a hair smaller than the size of the bearing.

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".

How small is "a hair smaller" for wood?
Press fits in metal are pretty precise. 0.001" smaller than the bearing is a light/ medium fit, whereas 0.002" is a heavy press fit, for the usual FRC bearings. Wood would be more forgiving on the size.

[fb39ca4]

Originally Posted by asid61

How small is "a hair smaller" for wood?
Press fits in metal are pretty precise. 0.001" smaller than the bearing is a light/ medium fit, whereas 0.002" is a heavy press fit, for the usual FRC bearings. Wood would be more forgiving on the size.

Like z_beeblebrox was saying, the number varies due to the laser kerf, as well as the softness of the wood. If you haven't tried it before, I would cut a test piece with different sized holes in 0.001" increments to determine the ideal size. The other option is cutting holes slightly too small and sanding the inside until the bearings press fit.