OCCRA
Go to Post This is what I love about FIRST everyone helps and asks why later. - Kyle [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 10-10-2018, 05:15 PM
Delphine's Avatar
Delphine Delphine is offline
Registered User
FRC #0395 (2Train Robotics)
Team Role: Mentor
 
Join Date: Jan 2015
Rookie Year: 2014
Location: Washington
Posts: 14
Delphine is an unknown quantity at this point
Robot Cart Designs

Hello!
Team 395 is interested in building a new cart for our robot, and we were wondering if anyone has any advice that would help us design it. Our old cart is very bulky and difficult to maneuver and we're looking to make something new! We're also looking to make this into a project to get familiar with design/machining so we would like to add some element of "home made" to it (aka not just buying something...potentially buying something and building off of it?) Any ideas would be appreciated!

Thanks!

Team 395
Reply With Quote
  #2   Spotlight this post!  
Unread 10-10-2018, 05:22 PM
AllenGregoryIV's Avatar
AllenGregoryIV AllenGregoryIV is offline
Engineering Coach
AKA: Allen "JAG" Gregory
FRC #3847 (Spectrum)
Team Role: Coach
 
Join Date: Jul 2008
Rookie Year: 2003
Location: Texas
Posts: 3,032
AllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond repute
Send a message via AIM to AllenGregoryIV
Re: Robot Cart Designs

Spectrum's Cart CAD
__________________

Team 647 | Cyber Wolf Corps | Alumni | 2003-2006 | Shoemaker HS
Team 2587 | DiscoBots | Mentor | 2008-2011 | Rice University / Houston Food Bank
Team 3847 | Spectrum | Coach | 2012-20... | St Agnes Academy
LRI | Alamo Regional | 2014-20...
"Competition has been shown to be useful up to a certain point and no further, but cooperation, which is the thing we must strive for today, begins where competition leaves off." - Franklin D. Roosevelt
Reply With Quote
  #3   Spotlight this post!  
Unread 10-10-2018, 05:24 PM
Delphine's Avatar
Delphine Delphine is offline
Registered User
FRC #0395 (2Train Robotics)
Team Role: Mentor
 
Join Date: Jan 2015
Rookie Year: 2014
Location: Washington
Posts: 14
Delphine is an unknown quantity at this point
Re: Robot Cart Designs

Also if anyone has wheel recommendations that would be super as well
Reply With Quote
  #4   Spotlight this post!  
Unread 10-10-2018, 05:32 PM
Billfred's Avatar
Billfred Billfred is online now
Never look back, no, never say die
AKA: Always attack with the warrior's cry...
FRC #1293 (Pandamaniacs); FTC #11444 (Garnet Squadron) (Also, CD mod.)
Team Role: Mentor
 
Join Date: Feb 2004
Rookie Year: 2004
Location: The Shadow Realm
Posts: 9,576
Billfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond reputeBillfred has a reputation beyond repute
Re: Robot Cart Designs

Start by figuring out your needs.

What has to fit on there, in addition to the robot? Driver station? Spare battery? The other bumpers? Tools? Gloves? Safety gear? Some emergency hardware, for when your freshman human player drops the bumper pins?

How big are the doorways in your shops and at events? Does your pit have a front clearance that might require a change from your usual cart to a shorter cart so a tall robot can fit? Do you have any space limitations in your truck/bus/van/trailer/whatever-gets-your-gear-there? Do you have to clear any particular terrain? (Spoiler on this one, yes you do, strongly consider big air-filled wheels or you'll be fighting every cable protector you see.)

Once you know how the cart fits into your system, I think you'll have a better idea of what you need to change.

(Also, this post was partly to plant 4451's carts in your psyche. )
__________________
William "Billfred" Leverette - Gamecock/Jessica Boucher victim/Owner/Director of Bricks 4 Kidz in Columbia, SC.

2004-2006: FRC 1293 (D5 Robotics) - Student, Mentor, Coach
2007-2009: FRC 1618 (Capital Robotics) - Mentor, Coach
2009-2013: FRC 2815 (Los Pollos Locos) - Mentor, Coach - Palmetto '09, Peachtree '11, Palmetto '11, Palmetto '12
2010: FRC 1398 (Keenan Robo-Raiders) - Mentor - Palmetto '10
2014-2016: FRC 4901 (Garnet Squadron) - Co-Founder and Head Bot Coach - Orlando '14, SCRIW '16
2017: FRC 5402 (Iron Kings) - Mentor, Coach (oh, and I worked at AndyMark during this time)
2018-: FRC 1293 (Pandamaniacs) - Mentor

113 events (more than will fit in a ChiefDelphi signature), 15 seasons, over 74,500 miles, and still on a mission from Bob.
Rule #1: Do not die. Rule #2: Be respectful. Rule #3: Be safe. Rule #4: Follow the handbook.
Reply With Quote
  #5   Spotlight this post!  
Unread 10-10-2018, 06:39 PM
AllenGregoryIV's Avatar
AllenGregoryIV AllenGregoryIV is offline
Engineering Coach
AKA: Allen "JAG" Gregory
FRC #3847 (Spectrum)
Team Role: Coach
 
Join Date: Jul 2008
Rookie Year: 2003
Location: Texas
Posts: 3,032
AllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond reputeAllenGregoryIV has a reputation beyond repute
Send a message via AIM to AllenGregoryIV
Re: Robot Cart Designs

Harbor freight 8" solid rubber (not pneumatic) castors and wheels. Two locking casters and two none swivel casters. Pneumatic tires can have blow outs at events or get flats that's really annoying.
__________________

Team 647 | Cyber Wolf Corps | Alumni | 2003-2006 | Shoemaker HS
Team 2587 | DiscoBots | Mentor | 2008-2011 | Rice University / Houston Food Bank
Team 3847 | Spectrum | Coach | 2012-20... | St Agnes Academy
LRI | Alamo Regional | 2014-20...
"Competition has been shown to be useful up to a certain point and no further, but cooperation, which is the thing we must strive for today, begins where competition leaves off." - Franklin D. Roosevelt
Reply With Quote
  #6   Spotlight this post!  
Unread 10-10-2018, 08:21 PM
marshall's Avatar
marshall marshall is online now
Online Stripe & Drape Sales
FRC #0900 (The Zebracorns)
Team Role: Mentor
 
Join Date: Jan 2012
Rookie Year: 2003
Location: North Carolina
Posts: 2,927
marshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond reputemarshall has a reputation beyond repute
Re: Robot Cart Designs

Quote:
Originally Posted by AllenGregoryIV View Post
Harbor freight 8" solid rubber (not pneumatic) castors and wheels. Two locking casters and two none swivel casters. Pneumatic tires can have blow outs at events or get flats that's really annoying.
Pneumatic tires are also no better on foam tiles than other tires.
__________________
"La mejor salsa del mundo es la hambre" - Miguel de Cervantes
"The future is unwritten" - Joe Strummer
"Simplify, then add lightness" - Colin Chapman
Clarke's Laws
Reply With Quote
  #7   Spotlight this post!  
Unread 10-10-2018, 11:25 PM
Daniel Ascencio Daniel Ascencio is offline
Registered User
FRC #5012 (Gryffingear)
Team Role: CAD
 
Join Date: Apr 2018
Rookie Year: 2017
Location: Palmdale, CA
Posts: 1
Daniel Ascencio is an unknown quantity at this point
Re: Robot Cart Designs

Going back to what Billfred said, it is very important to understand your team's exact needs. With robot carts, it typically isn't a one-size-fits-all type of solution.
Obviously, making sure you know what you want to store in the cart is crucial, but keep in mind that generally, the simpler the design, the better, so long as it meets your needs. I was initially planning on having our robot cart hold a bit more than needed, however, this would have resulted in issues for us, as the cart would have been difficult to move around with all that extra weight.
For our team's robot cart, we used a document to lay out the things we actually needed and anything that was desired but not necessary.
https://docs.google.com/document/d/1...it?usp=sharing

Here's an image of our robot cart for reference: https://imgur.com/Oip1hDR
For most of the aluminum tubing (the only exception is the horizontal 2x1 tube on the back) we went with 1/8" thickness to support quite a bit of weight.
On our gussets, we went with 0.09" gussets for everything except for the gussets used to mount the casters (0.25"). We went with 6" casters (2 swivel, 2 static), although bigger wheels would probably make the cart a bit smoother.
We're still adding onto our robot cart, but this design has worked very well
for us so far, and was actually quite simple to assemble.
Reply With Quote
  #8   Spotlight this post!  
Unread 10-11-2018, 06:22 AM
Mr. Mike's Avatar
Mr. Mike Mr. Mike is offline
Registered User
FRC #3138 (Innovators)
Team Role: Mentor
 
Join Date: Mar 2010
Rookie Year: 2010
Location: Vandalia, Ohio
Posts: 100
Mr. Mike is a name known to allMr. Mike is a name known to allMr. Mike is a name known to allMr. Mike is a name known to allMr. Mike is a name known to allMr. Mike is a name known to all
Re: Robot Cart Designs

+1 on the 8" solid rubber wheels.

Also design the top of the cart so it can be changed from year to year and it holds the frame. With the wheels free you can test the drive train in the pits.

Mr. Mike
Reply With Quote
  #9   Spotlight this post!  
Unread 10-11-2018, 06:45 AM
Tom Line's Avatar
Tom Line Tom Line is offline
Don't lay blame. Fix probems.
FRC #1718 (The Fighting Pi)
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 1999
Location: Armada, Michigan
Posts: 3,160
Tom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond repute
Re: Robot Cart Designs

Quote:
Originally Posted by Delphine View Post
Hello!
Team 395 is interested in building a new cart for our robot, and we were wondering if anyone has any advice that would help us design it. Our old cart is very bulky and difficult to maneuver and we're looking to make something new! We're also looking to make this into a project to get familiar with design/machining so we would like to add some element of "home made" to it (aka not just buying something...potentially buying something and building off of it?) Any ideas would be appreciated!

Thanks!

Team 395
We just went through this exercise. After thinking about it for a while, we actually went to something a little like Spectrum's cart. We decided that the lighter the cart the better. Excess weight poses difficulties in maneuvering around small spaces, and makes it hard to push on carpets and foam pads. We see both those during the season.

Our cart uses 6 inch wheels. I would absolutely not go any smaller than that. We carry an absolute minimum of tools on the cart. The tools are usually limited to a set of hex wrenches, some zip ties, and a wire stripper. We have room for a couple full batteries and an empty. We also have an inverter and USB plugs attached. The top of our cart is usually a couple of 2x6's that we change out every year to "tailor" the cart to the robot. There is also a little room for bumpers because there are matches have short turn-around and you need to change bumpers and batteries without returning to the pits.
Reply With Quote
  #10   Spotlight this post!  
Unread 10-11-2018, 06:48 AM
AriMB's Avatar
AriMB AriMB is offline
The Philadelphian emigrant
AKA: Ari Meles-Braverman
FRC #5987 (Galaxia)
Team Role: Mentor
 
Join Date: Mar 2015
Rookie Year: 2012
Location: Haifa, Israel
Posts: 1,717
AriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond repute
Re: Robot Cart Designs

My favorite robot cart I've used is the one my team built this past year. I wrote about it here.

It's useful for multiple years' robots, as it can both be tall (for short robots) and short (for tall robots). It also features a control panel shelf and small tool cabinet near the handles, which I forgot to mention.
__________________
Studying MechE at the Technion - Israel Institute of Technology
2017-present: FIRST Israel CSA/FTAA
2017-present: FRC 5987 Technical Mentor 18isr2 18isr4 18isrcmp 18carv
2012-2016: FRC 423 Member 15njtab 15padre 16paphi
Reply With Quote
  #11   Spotlight this post!  
Unread 10-11-2018, 12:17 PM
philso philso is offline
Mentor
no team
 
Join Date: Jan 2011
Rookie Year: 2009
Location: Houston, Tx
Posts: 1,676
philso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond reputephilso has a reputation beyond repute
Re: Robot Cart Designs

Quote:
Originally Posted by Tom Line View Post
We just went through this exercise. After thinking about it for a while, we actually went to something a little like Spectrum's cart. We decided that the lighter the cart the better. Excess weight poses difficulties in maneuvering around small spaces, and makes it hard to push on carpets and foam pads. We see both those during the season.

Our cart uses 6 inch wheels. I would absolutely not go any smaller than that. We carry an absolute minimum of tools on the cart. The tools are usually limited to a set of hex wrenches, some zip ties, and a wire stripper. We have room for a couple full batteries and an empty. We also have an inverter and USB plugs attached. The top of our cart is usually a couple of 2x6's that we change out every year to "tailor" the cart to the robot. There is also a little room for bumpers because there are matches have short turn-around and you need to change bumpers and batteries without returning to the pits.
When my son and I were with DiscoBots, we built a light, flat-deck cart. It was light enough, that it could be flipped upside down and slid in over a bunch of totes in the back of my SUV.

To get the height, we just put an empty tote on the deck and sat the robot on it. When the robot was really tall, they didn't use the tote.
Reply With Quote
  #12   Spotlight this post!  
Unread 10-12-2018, 08:22 AM
Aaron Li's Avatar
Aaron Li Aaron Li is offline
Registered User
FRC #1665 (Weapons of Mass Construction)
Team Role: Driver
 
Join Date: Aug 2018
Rookie Year: 2017
Location: New York
Posts: 67
Aaron Li is an unknown quantity at this point
I would go with something low enough so carrying the robot off the field is quicker and efficient. I've seen other carts that were high and it was hard to get the robot on it as it needed to be lifted higher.

Sent from my Galaxy S8 using Tapatalk
img]http://i.imgur.com/hBGnCkd.png[img
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:25 AM.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi