pic: Bit Buckets 2015 Offseason Drivetrain

[z_beeblebrox]

Originally Posted by orangemoore

It appears that some parts were not saved in the same place as the rest of the project and were left behind when put on grabcad. Most of these parts are spacers and things that are not important

What parts are missing for you?

I just looked over the GrabCAD model and it looks like everything is there. I used SolidWorks Pack and Go, so it should have captured all of the parts regardless of location.

[orangemoore]

This is the message I got. I looked through the folder and couldn't find the part.
http://1drv.ms/13s7hOI

[z_beeblebrox]

I re-uploaded the model; try downloading again.

[orangemoore]

Originally Posted by z_beeblebrox

I re-uploaded the model; try downloading again.

Is it just me or did the Download All button go missing. I now have to download all of the files individually.

[z_beeblebrox]

Originally Posted by orangemoore

Is it just me or did the Download All button go missing. I now have to download all of the files individually.

Missing for me too. That's odd.

[orangemoore]

Originally Posted by z_beeblebrox

Missing for me too. That's odd.

Could it be a setting in the project?

[z_beeblebrox]

Originally Posted by orangemoore

Could it be a setting in the project?

I don't see anything.

[orangemoore]

Originally Posted by z_beeblebrox

I don't see anything.

The Button is Back!

[fb39ca4]

Very nice. Our team has had laser cut chassis for the past two years, but they are nowhere near as modular as yours.

[z_beeblebrox]

Originally Posted by fb39ca4

Very nice. Our team has had laser cut chassis for the past two years, but they are nowhere near as modular as yours.

Thank you. We looked at your team's robots when we were trying to figure out whether or how a laser-cut robot would work.

Do you guys have any experience with wood gearboxes or bearing press fits? We're trying them on this robot but won't have much time to test them before build season.

[fb39ca4]

Originally Posted by z_beeblebrox

Thank you. We looked at your team's robots when we were trying to figure out whether or how a laser-cut robot would work.

Do you guys have any experience with wood gearboxes or bearing press fits? We're trying them on this robot but won't have much time to test them before build season.

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".

[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.

[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.