Go to Post I think this is the forest that ChiefDelphi often misses as we're picking the branches off every tree. - Libby K [more]
Home
Go Back   Chief Delphi > ChiefDelphi.com Website > Extra 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 07-02-2017, 15:02
itsjustmrb itsjustmrb is offline
Registered User
FRC #4063 (TRikzR4kiDz)
Team Role: Coach
 
Join Date: Feb 2012
Rookie Year: 2012
Location: Del Rio, Texas
Posts: 156
itsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to behold
pic: 2" Mecanum

Reply With Quote
  #2   Spotlight this post!  
Unread 07-02-2017, 15:13
Max Boord Max Boord is offline
Registered User
FRC #0179 (The Children of The Swamp)
Team Role: Tactician
 
Join Date: Jun 2013
Rookie Year: 2002
Location: Florida
Posts: 240
Max Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant futureMax Boord has a brilliant future
Re: pic: 2" Mecanum

Have you guys tested these? I have always wanted to try 3d printing mecanum intake wheels but have not found a design/ filiment combination that I thought would hold up to robot to robot contact.
__________________
Past teams:
1523 (2011-2014)
1065 (2014-2016)
3932 & 4592 (2016)
1592 (2016-2017)
Reply With Quote
  #3   Spotlight this post!  
Unread 07-02-2017, 15:15
asid61's Avatar
asid61 asid61 is offline
Registered User
AKA: Anand Rajamani
FRC #1072 (Harker Robotics)
Team Role: Mentor
 
Join Date: Jan 2014
Rookie Year: 2013
Location: Cupertino, CA
Posts: 2,233
asid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond reputeasid61 has a reputation beyond repute
Re: pic: 2" Mecanum

Very cool! I would love to see some durability tests on these just because the material around the rollers looks a bit thin, but for intake purposes they look very capable.
__________________
<Now accepting CAD requests and commissions>

Reply With Quote
  #4   Spotlight this post!  
Unread 07-02-2017, 15:38
Clayton Summerall's Avatar
Clayton Summerall Clayton Summerall is offline
Mentor
FRC #4587 (Jersey Voltage)
Team Role: Mentor
 
Join Date: Apr 2013
Rookie Year: 2011
Location: Dickinson
Posts: 72
Clayton Summerall is on a distinguished road
Re: pic: 2" Mecanum

Where did you buy the rollers? Would you mind sharing the CAD file?
Reply With Quote
  #5   Spotlight this post!  
Unread 07-02-2017, 16:14
Big-b's Avatar
Big-b Big-b is online now
Registered User
FRC #0900 (♞Zebrarcorns♞)
Team Role: CAD
 
Join Date: Oct 2015
Rookie Year: 2016
Location: United States
Posts: 12
Big-b has a spectacular aura aboutBig-b has a spectacular aura about
Re: pic: 2" Mecanum

Quote:
Originally Posted by Clayton Summerall View Post
Where did you buy the rollers?
It looks like those are printed as well.
__________________
Reply With Quote
  #6   Spotlight this post!  
Unread 07-02-2017, 16:20
Cothron Theiss's Avatar
Cothron Theiss Cothron Theiss is online now
Registered Muser
FRC #4462 (Full Metal Jackets)
Team Role: College Student
 
Join Date: Feb 2016
Rookie Year: 2013
Location: Kingston, Tennessee
Posts: 601
Cothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond repute
Re: pic: 2" Mecanum

Quote:
Originally Posted by Big-b View Post
It looks like those are printed as well.
They actually look injection molded to me, but I might be wrong.

All in all, the look great! I will say, I think you could add a little bit of a fillet to all those interior angles and see some substantial gains in durability. Also, will these wheels ever be outside of your bumpers?
__________________
"It's taking longer than expected, which was to be expected."
Reply With Quote
  #7   Spotlight this post!  
Unread 07-02-2017, 16:53
s-neff's Avatar
s-neff s-neff is offline
Registered User
AKA: Sam
FRC #0841 (Biomechs)
Team Role: Mentor
 
Join Date: Apr 2016
Rookie Year: 2009
Location: California
Posts: 49
s-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud ofs-neff has much to be proud of
Re: pic: 2" Mecanum

Awesome! What was the manufacturing process for the rollers? Mind sharing the material choice? It's awesome that it looks like you don't have to run a brass sheath on the inner surface.

Are the lock nuts really <1/4" across? I haven't been able to source anything less than 1/4" wide off McMaster, which has made packaging the fasteners difficult. Or do you just accept that the nuts break the plane of the wheel, since it's only an intake for a round game piece?
__________________
Fun:
Mentor - Team 841 (2015 - ? )
Mentor - Team 4 (2013 - 2014)
Student - Team 192 (2009 - 2010)
Work:
SunPower Systems, Product Engineering - Utility Power Plants (2015 - ? )
BSci, Mechanical Engineering, UCLA (2010-2015)
Reply With Quote
  #8   Spotlight this post!  
Unread 07-02-2017, 18:31
Clayton Summerall's Avatar
Clayton Summerall Clayton Summerall is offline
Mentor
FRC #4587 (Jersey Voltage)
Team Role: Mentor
 
Join Date: Apr 2013
Rookie Year: 2011
Location: Dickinson
Posts: 72
Clayton Summerall is on a distinguished road
Re: pic: 2" Mecanum

Quote:
Originally Posted by Big-b View Post
It looks like those are printed as well.
Those look like rubber rollers...
Reply With Quote
  #9   Spotlight this post!  
Unread 07-02-2017, 21:51
Kevin Sevcik's Avatar
Kevin Sevcik Kevin Sevcik is offline
(Insert witty comment here)
FRC #0057 (The Leopards)
Team Role: Mentor
 
Join Date: Jun 2001
Rookie Year: 1998
Location: Houston, Texas
Posts: 3,764
Kevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond reputeKevin Sevcik has a reputation beyond repute
Send a message via AIM to Kevin Sevcik Send a message via Yahoo to Kevin Sevcik
Re: pic: 2" Mecanum

If you're printing your own vectored intake wheels anyways, you should totally experiment with the roller angle to see what shoves the balls sideways the fastest. If I'm understanding Ether's mecanum kinematics paper and reasoning correctly (questionable propositions, both) then making the rollers more perpendicular should move the balls sideways faster. Maybe. Completely perpendicular or parallel both obviously fail, so maybe 45 is the fastest, but it just feels like something else should be.
__________________
The difficult we do today; the impossible we do tomorrow. Miracles by appointment only.

Lone Star Regional Troubleshooter
Reply With Quote
  #10   Spotlight this post!  
Unread 07-02-2017, 22:08
Cothron Theiss's Avatar
Cothron Theiss Cothron Theiss is online now
Registered Muser
FRC #4462 (Full Metal Jackets)
Team Role: College Student
 
Join Date: Feb 2016
Rookie Year: 2013
Location: Kingston, Tennessee
Posts: 601
Cothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond reputeCothron Theiss has a reputation beyond repute
Re: pic: 2" Mecanum

Quote:
Originally Posted by Kevin Sevcik View Post
If you're printing your own vectored intake wheels anyways, you should totally experiment with the roller angle to see what shoves the balls sideways the fastest. If I'm understanding Ether's mecanum kinematics paper and reasoning correctly (questionable propositions, both) then making the rollers more perpendicular should move the balls sideways faster. Maybe. Completely perpendicular or parallel both obviously fail, so maybe 45 is the fastest, but it just feels like something else should be.
Ooh, I like this idea. Do you know of anyone that's made custom mecanums for drive wheels that are anything other than 45°? You could do some really interesting drives that either have more or less power when strafing than usual. Course, they're still a waste of time. But that's beside the point.
__________________
"It's taking longer than expected, which was to be expected."
Reply With Quote
  #11   Spotlight this post!  
Unread 09-02-2017, 14:52
itsjustmrb itsjustmrb is offline
Registered User
FRC #4063 (TRikzR4kiDz)
Team Role: Coach
 
Join Date: Feb 2012
Rookie Year: 2012
Location: Del Rio, Texas
Posts: 156
itsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to behold
Re: pic: 2" Mecanum

Quote:
Originally Posted by Max Boord View Post
Have you guys tested these? I have always wanted to try 3d printing mecanum intake wheels but have not found a design/ filiment combination that I thought would hold up to robot to robot contact.
This is the first batch I have printed with the hex bore and they have held up pretty well. The intake is inside the robot this year, so I am an not too concerned.
__________________

2016 Hub City Regional Winner #3 Seed (3310 & 4301)
2016 Bayou Regional Winner #1 Seed (233 & 4087)
2015 Dallas & Alamo Creativity Award
2015-2016 Hub City Regional Gracious Professionalism
2014 Hub City Regional Engineering Inspiration
2012-2016 Alamo Regional Gracious Professionalism
2016 Bayou Regional Gracious Professionalism
2014 Dallas Regional Gracious Professionalism
2013 Alamo Regional Winners (2468 & 2789)
Reply With Quote
  #12   Spotlight this post!  
Unread 09-02-2017, 14:54
itsjustmrb itsjustmrb is offline
Registered User
FRC #4063 (TRikzR4kiDz)
Team Role: Coach
 
Join Date: Feb 2012
Rookie Year: 2012
Location: Del Rio, Texas
Posts: 156
itsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to beholditsjustmrb is a splendid one to behold
Re: pic: 2" Mecanum

Quote:
Originally Posted by s-neff View Post
Awesome! What was the manufacturing process for the rollers? Mind sharing the material choice? It's awesome that it looks like you don't have to run a brass sheath on the inner surface.

Are the lock nuts really <1/4" across? I haven't been able to source anything less than 1/4" wide off McMaster, which has made packaging the fasteners difficult. Or do you just accept that the nuts break the plane of the wheel, since it's only an intake for a round game piece?
The axles are M3 40mm stainless steel with nylock nuts.
__________________

2016 Hub City Regional Winner #3 Seed (3310 & 4301)
2016 Bayou Regional Winner #1 Seed (233 & 4087)
2015 Dallas & Alamo Creativity Award
2015-2016 Hub City Regional Gracious Professionalism
2014 Hub City Regional Engineering Inspiration
2012-2016 Alamo Regional Gracious Professionalism
2016 Bayou Regional Gracious Professionalism
2014 Dallas Regional Gracious Professionalism
2013 Alamo Regional Winners (2468 & 2789)
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 19:51.

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


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi