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-   -   pic: Bit Buckets 2015 Offseason Drivetrain (http://www.chiefdelphi.com/forums/showthread.php?t=131268)

EricH 07-12-2014 22:12

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
If you do something similar in the future, cut the following letters into each disk:

T, U, I, and T.

Add your team number, and use as giveaways. When you finally get "a round TUIT"...:p :D

*ducks*

nixiebunny 07-12-2014 22:16

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
The Trotec Speedy 300 at our build space, Xerocraft Hackerspace, has a 29" x 17" bed. We made the top and bottom in 3 pieces to let us make a 28" square robot.

z_beeblebrox 07-12-2014 23:00

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Quote:

Originally Posted by EricH (Post 1412157)
If you do something similar in the future, cut the following letters into each disk:

T, U, I, and T.

Add your team number, and use as giveaways. When you finally get "a round TUIT"...:p :D

*ducks*

*throws 1.78 lbs of wooden circles*


z_beeblebrox 13-12-2014 21:54

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Another meeting tomorrow, another iteration ready to fab:


This version includes a significant redesign of the gearbox and its mount, allowing for a stiffer gearbox and more sensible encoder placement. New t-slot design should better retain nuts. The battery mount was enlarged and holes for a velcro strap were added. Small improvements to clearances, press fits and lightening holes were made throughout the model.

This will be the last iteration of the drivetrain before build season. We received our Vex Pro and FIRST Choice orders, so will be assembling the full powertrain and wiring all the electronics on this version.

Here's all of the wooden parts, laid out for the laser:

nixiebunny 14-12-2014 23:46

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
We tested our last-week's robot base to destruction with a car.

http://youtu.be/kjUfTZ4KFO0

The next couple of drive-overs resulted in a flat tire on the Volvo.

This week's robot is closer to working with real wheels and motors and electronics!

MrForbes 15-12-2014 00:05

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Quote:

Originally Posted by nixiebunny (Post 1414115)
The next couple of drive-overs resulted in a flat tire on the Volvo.

That was what I predicted, watching the video. Poor little car.

philso 17-12-2014 13:52

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Quote:

Originally Posted by nixiebunny (Post 1414115)
We tested our last-week's robot base to destruction with a car.

http://youtu.be/kjUfTZ4KFO0

The next couple of drive-overs resulted in a flat tire on the Volvo.

This week's robot is closer to working with real wheels and motors and electronics!

Beautiful robot chassis. Beautiful car. It is a shame that either one got damaged.

z_beeblebrox 18-12-2014 00:19

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
We worked more on assembly and wiring today. Photos soon to come.

We do have two exciting documents to share: the CAD model and our engineering journal.

The CAD model posted contains a few bugs that we fixed with a drill and jigsaw, but is still a basically functional drivetrain:
https://grabcad.com/library/bit-buck...n-drivetrain-1

The engineering journal is a description of our process and decisions in building this project. It is not an exhaustive document, nor is it a particularly polished one, but it will contain helpful ideas for designing things with plywood:
https://docs.google.com/document/d/1...it?usp=sharing

Have fun and feel free to ask any questions.

z_beeblebrox 18-12-2014 09:28

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Some pictures:
http://www.chiefdelphi.com/media/photos/41024?
http://www.chiefdelphi.com/media/photos/41023?
http://www.chiefdelphi.com/media/photos/41022?
http://www.chiefdelphi.com/media/photos/41021?
http://www.chiefdelphi.com/media/photos/41020?
http://www.chiefdelphi.com/media/photos/41019?
http://www.chiefdelphi.com/media/photos/41018?

nuclearnerd 18-12-2014 09:38

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Pretty!

I hope you have a chance to bash this bot up in some open field defense. I'd really like to see how the plywood base holds up compared to, say, and AM14U, given that yours has much more cross-bracing. If it works OK it could be a really cheap way to design custom chassis (cheaper than laser cutting and bending aluminum anyway)

s_forbes 18-12-2014 12:54

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Latest iteration looks great! Get some bumpers and weight and drive it like you stole it.

I got to see the previous one (in the car crushing video) in person. It's an extremely clever design that somehow ranks high in all of the desirable categories; extremely stiff, relatively lightweight, and can literally be cut out and assembled in an afternoon out of $50 worth of material. The drop-out wheel modules are pretty neat too, I don't think I've seen something done quite like that before.

Great prototype, I can't wait to see you apply these design concepts to the rest of your robot this season. Might be my new favorite build material.

orangemoore 21-12-2014 12:49

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
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

z_beeblebrox 21-12-2014 13:26

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
Quote:

Originally Posted by orangemoore (Post 1415636)
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 21-12-2014 13:37

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
This is the message I got. I looked through the folder and couldn't find the part.
http://1drv.ms/13s7hOI

z_beeblebrox 21-12-2014 14:21

Re: pic: Bit Buckets 2015 Offseason Drivetrain
 
I re-uploaded the model; try downloading again.


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