Go to Post I feel like watching match videos from 2003 could be considered a form of cruel and unusual punishment. - Cory [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 12-04-2013, 12:40
Botwoon's Avatar
Botwoon Botwoon is offline
A.K.A. Matthew Ruane
FRC #0207 (Metalcrafters)
Team Role: College Student
 
Join Date: Feb 2012
Rookie Year: 2009
Location: Southern California
Posts: 152
Botwoon will become famous soon enough
Re: pic: 2175 Wheel v2

Fully assembled, the wheel weighs 130 grams (.286 lbs). We use the 1" wide wedge top tread that Andymark sells. They changed the rubber compound they're using, and it seems a lot tougher than the kind they sold last year. We did two events on the same set, and they really don't look any different now than they did on bag day. Granted, we're only running 4 cims in a drivetrain that wasn't geared nearly as high as a lot of robots out there.

I'm looking at new options for tread attachment personally. What kind of glue did you guys use for your wheels?
Reply With Quote
  #2   Spotlight this post!  
Unread 13-04-2013, 00:39
nerdherdmember's Avatar
nerdherdmember nerdherdmember is offline
#letsdothis
AKA: Harrison (That kid with the blue hat)
FRC #0422 (Mech Tech Dragons)
Team Role: Alumni
 
Join Date: Mar 2012
Rookie Year: 2010
Location: Virginia
Posts: 25
nerdherdmember is a jewel in the roughnerdherdmember is a jewel in the roughnerdherdmember is a jewel in the roughnerdherdmember is a jewel in the rough
Re: pic: 2175 Wheel v2

Quote:
Originally Posted by Botwoon View Post
We used 1/2" alum this year. I believe we did 7/8" in 2012 and iirc we were rolling 1" hex in 2011. I'm too lazy to embed, but here's a link to the entire 2013 assembly (4" wheel). The back end of the axle is unfinished in this photo.
Is that a 3d printed bearing block? How are you tensioning it? Does this save time/weight over an aluminum version? We on 422 are strongly considering a 3d printer for next year, and things like this make us want to take the plunge. Is this printed on something like a makerbot/reprap with ABS or PLA, or is it Ultem with some more commercial printer?
Reply With Quote
  #3   Spotlight this post!  
Unread 13-04-2013, 01:08
Botwoon's Avatar
Botwoon Botwoon is offline
A.K.A. Matthew Ruane
FRC #0207 (Metalcrafters)
Team Role: College Student
 
Join Date: Feb 2012
Rookie Year: 2009
Location: Southern California
Posts: 152
Botwoon will become famous soon enough
Re: pic: 2175 Wheel v2

Quote:
Originally Posted by nerdherdmember View Post
Is that a 3d printed bearing block? How are you tensioning it? Does this save time/weight over an aluminum version? We on 422 are strongly considering a 3d printer for next year, and things like this make us want to take the plunge. Is this printed on something like a makerbot/reprap with ABS or PLA, or is it Ultem with some more commercial printer?
Yep, 3d printed. We print all of our parts at home out of ABS with a uprint from Dimension. It doesn't save any real time, but it saves man hours which is helpful considering the tiny team we had this year. It might take ten hours to print a couple of wheels, but all those hours are passing while we're asleep .

The ABS portion of the bearing block is captured with two long screws between the two plates, and the frame tube is captured between the two plates. Tensioning is accomplished using that cam sitting next to it on the table (the cam is bolted onto the frame tube next to the block, rotating it either pushes the bearing block outwards or allows it space to move inwards).

Last edited by Botwoon : 13-04-2013 at 01:13.
Reply With Quote
  #4   Spotlight this post!  
Unread 13-04-2013, 01:28
nerdherdmember's Avatar
nerdherdmember nerdherdmember is offline
#letsdothis
AKA: Harrison (That kid with the blue hat)
FRC #0422 (Mech Tech Dragons)
Team Role: Alumni
 
Join Date: Mar 2012
Rookie Year: 2010
Location: Virginia
Posts: 25
nerdherdmember is a jewel in the roughnerdherdmember is a jewel in the roughnerdherdmember is a jewel in the roughnerdherdmember is a jewel in the rough
Re: pic: 2175 Wheel v2

Quote:
Originally Posted by Botwoon View Post
Yep, 3d printed. We print all of our parts at home out of ABS with a uprint from Dimension. It doesn't save any real time, but it saves man hours which is helpful considering the tiny team we had this year. It might take ten hours to print a couple of wheels, but all those hours are passing while we're asleep .

The ABS portion of the bearing block is captured with two long screws between the two plates, and the frame tube is captured between the two plates. Tensioning is accomplished using that cam sitting next to it on the table (the cam is bolted onto the frame tube next to the block, rotating it either pushes the bearing block outwards or allows it space to move inwards).
Do you ream/bore the ABS after printing, or is the print within tolerance for a press fit already (if you press fit, you could be using the plates to hold it in place I guess)? What's the resolution/layer size of that printer? Is it comparable to the makerbot replicator 2? How do you manufacture the cam? Sorry for all the questions, seeing your robot fly off the bridge with 3d printed wheels was what really planted the seed of 3d printing in my mind last year, so being able to get responses is very nice.
Reply With Quote
  #5   Spotlight this post!  
Unread 11-04-2013, 16:02
Aren_Hill's Avatar
Aren_Hill Aren_Hill is offline
Build Nifty Things
no team
Team Role: Mentor
 
Join Date: Feb 2005
Rookie Year: 2005
Location: Menlo Park CA
Posts: 1,218
Aren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond reputeAren_Hill has a reputation beyond repute
Re: pic: 2175 Wheel v2

Quote:
Originally Posted by Boe View Post
I view these as a case of someone who has not yet realized the full potential of a 3D printer, my guess is you could use a fair amount less material, resulting in a lighter wheel, and also have it much more aesthetically pleasing.

Let your imagination run wild, I always have to re-jump the hurdle when I cad something I know will only be 3D printed, as past experience has taught me to CAD for whatever machining capabilities I've had at hand.
3D printers only recently joined this list, and its been fun.

go crazy, you're allowed to
__________________
A guy who likes robots.
1625->3928->148->1296->971 oh dear
Reply With Quote
  #6   Spotlight this post!  
Unread 11-04-2013, 16:07
Boe's Avatar
Boe Boe is offline
2175 Alum
AKA: Brian Boehm
FRC #2175 (The Fighting Calculators)
Team Role: Alumni
 
Join Date: Mar 2012
Rookie Year: 2012
Location: Oakdale, Minnesota
Posts: 527
Boe has much to be proud ofBoe has much to be proud ofBoe has much to be proud ofBoe has much to be proud ofBoe has much to be proud ofBoe has much to be proud ofBoe has much to be proud ofBoe has much to be proud ofBoe has much to be proud of
Re: pic: 2175 Wheel v2

Quote:
Originally Posted by Aren_Hill View Post
I view these as a case of someone who has not yet realized the full potential of a 3D printer, my guess is you could use a fair amount less material, resulting in a lighter wheel, and also have it much more aesthetically pleasing.

Let your imagination run wild, I always have to re-jump the hurdle when I cad something I know will only be 3D printed, as past experience has taught me to CAD for whatever machining capabilities I've had at hand.
3D printers only recently joined this list, and its been fun.

go crazy, you're allowed to
Notice the 7 spokes But in all seriousness we knew we could do some really cool designs and there were team members that really wanted to, but we decided to play it safe for our first year doing this with such an important robot part. Expect some much cooler wheels in future years if we continue printing wheels which i personally hope we do
__________________
2014 IRI-Quarterfinalists (Thanks 368, 1477, 233)
2014 Minnesota State Championship-Winner (Thanks 2052, 4778)
2014 Archimedes Division-Quaterfinalists (Thanks 399, 2056, 2834)
2014 North Star-Semifinalists (Thanks 967, 4607)-Creativity Award-Safety Award
2014 Northern Lights-Winners (Thanks 359, 2502)-Excellence in Engineering-Safety Award
2013 Minne-Mini-Winners (Thanks 2169, 3883, 4239)
2013 MRI-Winners (Thanks 2052, 3130, 3313)
2013 MN State Fair-Winners
2013 IRI-Participant
2013 Minnesota State Championship-Winners (Thanks 2052, 4607)
2013 Galileo Division-Finalists (Thanks 2169, 3284)
2013 North Star Regional-Team Spirit Award-Winners (Thanks 967, 4607)
2013 Northern Lights Regional-Entrepreneurship Award-Quarterfinalists (Thanks 3130, 1675)
2012 North Star Regional-Creativity Award-Quarterfinalists (Thanks 2549, 3130)
2012 Lake Superior Regional-Coopertition Award-Quarterfinalists (Thanks 1625, 2957)
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 22:32.

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