Build Blitz CAD

[Ty Tremblay]

Additional choo-choo question.

Am I missing something in the model, or will the choo-choo interfere with itself as the large gear rotates? I'm assuming in the haste of Build Blitz, CADing spacers was not high priority, but I'd like to make sure.

[Grant Cox]

Originally Posted by Coach Norm

I have a question about the Choo Choo and the Lexan tab mentioned in the blog. I do not completely understand how the Lexan is used with the alignment and cannot find it in the CAD drawings. I know a picture was posted in the blog but could not wrap my head around how this tab was used.

This was one casualty of trying to liveblog while our team of stellar engineers worked faster than I could type - at one point it was the plan, but as Aren said, the ratchet wrench + limit switch ended up working fine.

The idea was that the tab hung down vertically in between the two gears of the choo-choo. During normal operation, the larger gear spun clockwise, brushing the lexan out of the way (think sort of like a playing card in a bicycle spoke). However, if the system tried to backdrive, the interface between the two gears would reverse, choking the lexan tab into tension between the two gears and locking it up.

[Coach Norm]

Originally Posted by Grant Cox

The idea was that the tab hung down vertically in between the two gears of the choo-choo. During normal operation, the larger gear spun clockwise, brushing the lexan out of the way (think sort of like a playing card in a bicycle spoke). However, if the system tried to backdrive, the interface between the two gears would reverse, choking the lexan tab into tension between the two gears and locking it up.

Thanks for the response Grant.

Is the 3D printed CAM the black tab on the hex shaft? Is this the tab that was used in conjunction with a limit switch that is not shown?

Thanks again - learning still from the Build Blitz and the follow up CAD.

[Aren_Hill]

Originally Posted by Coach Norm

Thanks for the response Grant.

Is the 3D printed CAM the black tab on the hex shaft? Is this the tab that was used in conjunction with a limit switch that is not shown?

Thanks again - learning still from the Build Blitz and the follow up CAD.

This is correct, the CAM was a quick 20min print job.

[JVN]

Originally Posted by Nemo

Wow. That is just about the coolest thing ever.

Just so you know... we're referring to that as the "Nemo hole" in house.
"Does the Rev2 Rail have the Nemo hole in it?"
"Yes, and I also added a mirrored Nemo hole for Dead Axle configs."

[Grant Cox]

Originally Posted by JVN

Just so you know... we're referring to that as the "Nemo hole" in house.

He wasn't kidding.

http://www.vexrobotics.com/vexpro/st...-in-a-day.html

[Nemo]

Our team finds that to be pretty entertaining. We did end up choosing Drive in a Day as our frame - it's a nice system in that it's pretty quick to build and does what we need it to do.

This year it's a tough call between AM14U, VersaChassis, and Drive in a Day. They're all really nice, flexible, well thought-out drive bases that a team can put together quickly.

[cadandcookies]

Originally Posted by Grant Cox

He wasn't kidding.

http://www.vexrobotics.com/vexpro/st...-in-a-day.html

Just saying, I've been looking at the model for the 2014 drive in a day and want to express my thanks to anyone who worked on it (from TeamJVN to Nemo's input). You guys have managed to make one of the most feature-packed chassis I've ever had the fortune of laying eyes on. Truly hats off to the guys at VexPro.

Now to convince my team to use it!