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-   -   paper: 2014 HOT Tech Notes (http://www.chiefdelphi.com/forums/showthread.php?t=127827)

Chadfrom308 17-03-2014 19:17

Re: paper: 2014 HOT Tech Notes
 
Thank you so much for this. When our team did terrible in 2013, I spent days looking over things like this. I ran into your tech notes and it was like I struck gold. I showed this to our head engineer and we decided to do what you did. We used waterjet 5052 1/16" aluminum and lowered the pneumatics use. We also did our own little spin by adding some mounting holes, cable management holes, and some strain reliefs built in to the chassis. We even had to buy our own 5052 stock because Chrysler (or fiat now ;) ) only had 6061.

In short, thanks. This really helped us get a good base down to start tinkering with.

Adam Freeman 18-03-2014 08:09

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Chadfrom308 (Post 1360536)
In short, thanks. This really helped us get a good base down to start tinkering with.

Chad, thanks for the kind words...I'm glad that the tech notes are being used.

We were really impressed with your machine and driver's at Howell. Keep it up!

Looking forward to seeing you in Lansing.

-Adam

tim-tim 19-03-2014 18:47

Re: paper: 2014 HOT Tech Notes
 
Adam,

Thanks for sharing the Tech Notes again this year. I finally got a chance to read them, after watching some of your matches of course. It is always cool as an engineer to know how something works and some of the thoughts throughout the process.

Good luck the rest of the season and hopefully I can see this beast of a machine at Champs!

Adam Freeman 01-04-2014 08:38

Re: paper: 2014 HOT Tech Notes
 
Since we weren't able to finish our premier night reveal video in time, we waited until we had additional footage to publish a video.

Fresh from the HOT Team Promotional Department is a video featuring our robot at the Howell District: https://www.youtube.com/watch?v=pHBzLlr8aso

Additional videos from Waterford can be found here: https://www.youtube.com/watch?v=-AGQ...zK-g_bv4hkgwwd

Enjoy!

Ty Tremblay 01-04-2014 08:56

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Adam Freeman (Post 1367748)
Fresh from the HOT Team Promotional Department is a video featuring our robot at the Howell District: https://www.youtube.com/watch?v=pHBzLlr8aso

Enjoy!

Good song choice. The last time I remember a team using that song in their reveal video they won The World Championship.

Adam Freeman 01-04-2014 10:04

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Ty Tremblay (Post 1367752)
Good song choice. The last time I remember a team using that song in their reveal video they won The World Championship.

Nice!!! I wish I could say that was intentional, but unfortunately that might be the only Robowrangler video I have never watched.

But, I am not suprised that us and 148 would choose similar music:
http://instagram.com/p/jUvPJGn23l/

Adam Freeman 30-07-2014 14:21

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Adam Freeman (Post 1358634)
CAD models coming soon...

Finally got around to posting the CAD files: http://frcdesigns.com/designs-2014/

Typical CAD disclaimers apply...not everything is 100% accurate to competition robot.

This is the most complete CAD model we have created. But, most of the robot was designed in AutoCAD then Solidworks models were created to help find integration and assembly issues. We are by no means CAD/modeling experts.

Enjoy!

g_sawchuk 30-07-2014 14:34

Re: paper: 2014 HOT Tech Notes
 
Wow, this is a great set of notes. It looks great as well, super attractive cover page. I like how you laid out every step of your process including game analysis, concepts, and design. Fantastic work, and thanks for sharing.

tim-tim 30-07-2014 20:48

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Adam Freeman (Post 1394846)
Finally got around to posting the CAD files: http://frcdesigns.com/designs-2014/

Typical CAD disclaimers apply...not everything is 100% accurate to competition robot.

This is the most complete CAD model we have created. But, most of the robot was designed in AutoCAD then Solidworks models were created to help find integration and assembly issues. We are by no means CAD/modeling experts.

Enjoy!

Thanks Adam, and HOT! First pneumatics, now CAD. Can't wait to dive into the design.

notmattlythgoe 31-07-2014 12:37

Re: paper: 2014 HOT Tech Notes
 
Adam, great robot this year. I look forward to reading through your design process and stealing ideas that we think will improve our process. Hope to see you guys again next year.

April_robo 31-07-2014 13:06

Re: paper: 2014 HOT Tech Notes
 
I love that I still read every word of the Tech Notes even though I know most of it. As a new mentor its nice to have these resources around. Thanks Adam love the robot and the team.

MrRiedemanJACC 31-07-2014 23:57

Re: paper: 2014 HOT Tech Notes
 
Adam, The step file looks great. Not so sure I'm glad I saw this, I won't be getting much sleep now!

It always amazes me how well designed your robots are and how you can push something right to the limit. The first thing I noticed is that you don't direct drive any of your wheels on the drivetrain. Is there a specific reason for that? Or do you just want to keep the weight of your Cims and gearbox centered?

Also, I am impressed with the 9 mm belts, seems like that is just too close to breaking, but I like that you were able to do that.

In the model it looks like you raised the outerwheels about 1/8"? Is that what you went with or did you need more and shaved the wheels a bit?

Thanks for posting this!

Adam Freeman 01-08-2014 10:35

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by MrRiedemanJACC (Post 1394995)
Adam, The step file looks great. Not so sure I'm glad I saw this, I won't be getting much sleep now!

It always amazes me how well designed your robots are and how you can push something right to the limit. The first thing I noticed is that you don't direct drive any of your wheels on the drivetrain. Is there a specific reason for that? Or do you just want to keep the weight of your Cims and gearbox centered?

Also, I am impressed with the 9 mm belts, seems like that is just too close to breaking, but I like that you were able to do that.

In the model it looks like you raised the outerwheels about 1/8"? Is that what you went with or did you need more and shaved the wheels a bit?

Thanks for posting this!

We've used this chassis setup for a couple of years now, so most of it just carries over from year to year. At the start we decided that it was easier to leave the gearboxes centered for packaging and CG purposes. At this point we are comfortable with the gearing and chain/belt routing that we've just left them there. It helps us get a jump start on the season knowing we can get a chassis design solidified quickly so we can move on to more game specific components of the robot.

We actually switched from the 9mm belts to 15mm belts after we broke a belt practicing before the season. We had quite a bit of practice time on that belt and only one side broke, so I would guess something might have happened to that belt when it was re-installed (we had just replaced wheels before it failed). We ended up using 15mm kevlar re-inforced belts to ensure that we didn't have any drivetrain issues. We had the space and weight, so better safe than sorry.

The only drivetrain issue we experienced this year was picking up some debris in the drive that flipped the belt over and shredded it.

We stayed with the 1/8 raise on the outside wheels. We didn't shave the wheels, but the turning performance did increase as the outside wheels wore down. We had some issues throughout the season with popping the main breaker, which I'm sure the turning scrub had quite a bit of influence.

Overall we weren't extremely happy with the chassis performance from an agility standpoint, getting out of t-bones, avoiding defense, etc. We will probably do a complete re-evaluation of the chassis size, shape, # of wheels for next year.

Andrew Schreiber 01-08-2014 10:56

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Adam Freeman (Post 1395016)
We've used this chassis setup for a couple of years now, so most of it just carries over from year to year. At the start we decided that it was easier to leave the gearboxes centered for packaging and CG purposes. At this point we are comfortable with the gearing and chain/belt routing that we've just left them there. It helps us get a jump start on the season knowing we can get a chassis design solidified quickly so we can move on to more game specific components of the robot.

We actually switched from the 9mm belts to 15mm belts after we broke a belt practicing before the season. We had quite a bit of practice time on that belt and only one side broke, so I would guess something might have happened to that belt when it was re-installed (we had just replaced wheels before it failed). We ended up using 15mm kevlar re-inforced belts to ensure that we didn't have any drivetrain issues. We had the space and weight, so better safe than sorry.

The only drivetrain issue we experienced this year was picking up some debris in the drive that flipped the belt over and shredded it.

We stayed with the 1/8 raise on the outside wheels. We didn't shave the wheels, but the turning performance did increase as the outside wheels wore down. We had some issues throughout the season with popping the main breaker, which I'm sure the turning scrub had quite a bit of influence.

Overall we weren't extremely happy with the chassis performance from an agility standpoint, getting out of t-bones, avoiding defense, etc. We will probably do a complete re-evaluation of the chassis size, shape, # of wheels for next year.


Was this a VP belt that snapped? I ask because we ran belts on our intake this year and ended up having to replace every single VP belt at least once. We had one non VP belt from a different supplier (SDP-SI?) and it survived the entire season. Trying to see if our experience was unique or if others have seen that the VP belts have a shorter lifetime than those of other suppliers or if there was something different between the runs.

* And anyone who is worried, VP belts are probably fine for anyone who does a sane season. 125's was NOT sane.

DampRobot 01-08-2014 12:33

Re: paper: 2014 HOT Tech Notes
 
Quote:

Originally Posted by Andrew Schreiber (Post 1395018)
Was this a VP belt that snapped? I ask because we ran belts on our intake this year and ended up having to replace every single VP belt at least once. We had one non VP belt from a different supplier (SDP-SI?) and it survived the entire season. Trying to see if our experience was unique or if others have seen that the VP belts have a shorter lifetime than those of other suppliers or if there was something different between the runs.

* And anyone who is worried, VP belts are probably fine for anyone who does a sane season. 125's was NOT sane.

We had frequent 9mm belt snaps in our drivetrain, and heard similar things from other CA teams.


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