Go to Post FIRST... (is) just as human as we are. (except now in game hint season when they are big meanies) - Tetraman [more]
Home
Go Back   Chief Delphi > FIRST > General Forum
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #16   Spotlight this post!  
Unread 28-07-2016, 12:15
JesseK's Avatar
JesseK JesseK is offline
Expert Flybot Crasher
FRC #1885 (ILITE)
Team Role: Mentor
 
Join Date: Mar 2007
Rookie Year: 2005
Location: Reston, VA
Posts: 3,632
JesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond reputeJesseK has a reputation beyond repute
Re: 6X 775 - 6X 1.625" Drive

You're only a few 10th's of an inch away from making a polyurethane roller into a wheel. Not that you'd do such a thing.

These tiny Colsons may actually see some wear over the course of 50 matches.
__________________

Drive Coach, 1885 (2007-present)
CAD Library Updated 5/1/16 - 2016 Curie/Carver Industrial Design Winner
GitHub
Reply With Quote
  #17   Spotlight this post!  
Unread 28-07-2016, 12:34
Greg Woelki's Avatar
Greg Woelki Greg Woelki is offline
FRC Alumnus
FRC #1768
 
Join Date: May 2014
Rookie Year: 2013
Location: Bolton, MA
Posts: 97
Greg Woelki is a glorious beacon of lightGreg Woelki is a glorious beacon of lightGreg Woelki is a glorious beacon of lightGreg Woelki is a glorious beacon of lightGreg Woelki is a glorious beacon of light
Re: 6X 775 - 6X 1.625" Drive

Quote:
Originally Posted by Eric Scheuing View Post
Can we get a render of just the gearbox itself?

I'm also concerned with the gearbox mounting method. Would there be any issues with the fasteners bottoming out on each other before you can get a solid joint?
Are you referring to the in-line standoffs? Nick appears to be using the same standoffs-and-set-screws construction method that we used on the dozens of in-line standoffs in our robot's hood this year. I can assure you that the joints are plenty strong.
Reply With Quote
  #18   Spotlight this post!  
Unread 28-07-2016, 12:54
Chris is me's Avatar
Chris is me Chris is me is online now
no bag, vex only, final destination
AKA: Pinecone
FRC #0228 (GUS Robotics); FRC #2170 (Titanium Tomahawks)
Team Role: Mentor
 
Join Date: Dec 2008
Rookie Year: 2006
Location: Glastonbury, CT
Posts: 7,621
Chris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond reputeChris is me has a reputation beyond repute
Send a message via AIM to Chris is me
Re: 6X 775 - 6X 1.625" Drive

Quote:
Originally Posted by JesseK View Post
You're only a few 10th's of an inch away from making a polyurethane roller into a wheel. Not that you'd do such a thing.

These tiny Colsons may actually see some wear over the course of 50 matches.
Over something like 300-500 matches worth of drive time, a 4" Colson wheel will actually wear enough to negate the drop center in a 6WD. You have to be really abusing these wheels for it to happen, but it does. A 1.625" Colson would wear about 2.5 times faster than that.

Nick: Is this setup actually lighter than a traditional WCD with 3" wheels? With the thicker plate and the gears and stuff, I would be inclined to say probably not.
__________________
Mentor / Drive Coach: 228 (2016-?)
...2016 Waterbury SFs (with 3314, 3719), RIDE #2 Seed / Winners (with 1058, 6153), Carver QFs (with 503, 359, 4607)
Mentor / Consultant Person: 2170 (2017-?)
---
College Mentor: 2791 (2010-2015)
...2015 TVR Motorola Quality, FLR GM Industrial Design
...2014 FLR Motorola Quality / SFs (with 341, 4930)
...2013 BAE Motorola Quality, WPI Regional #1 Seed / Delphi Excellence in Engineering / Finalists (with 20, 3182)
...2012 BAE Imagery / Finalists (with 1519, 885), CT Xerox Creativity / SFs (with 2168, 118)
Student: 1714 (2009) - 2009 Minnesota 10,000 Lakes Regional Winners (with 2826, 2470)
2791 Build Season Photo Gallery - Look here for mechanism photos My Robotics Blog (Updated April 11 2014)
Reply With Quote
  #19   Spotlight this post!  
Unread 28-07-2016, 13:00
OccamzRazor's Avatar
OccamzRazor OccamzRazor is offline
Go YETI!
AKA: Robbie
FRC #3506 (YETI)
Team Role: Engineer
 
Join Date: Jan 2009
Rookie Year: 2003
Location: Charlotte, North Carolina
Posts: 169
OccamzRazor is a splendid one to beholdOccamzRazor is a splendid one to beholdOccamzRazor is a splendid one to beholdOccamzRazor is a splendid one to beholdOccamzRazor is a splendid one to beholdOccamzRazor is a splendid one to behold
Re: 6X 775 - 6X 1.625" Drive

This is very interesting but I don't think those little wheels would hold up long unless you added more of them. Ground clearance isn't the issue with this design at all, our 2013 robot was .250 off the ground and carpet was not an issue even when rolling over the pyramid corner plates.

This is awesome, hilarious, creative, well done, and a lot of other things.

I just have to wonder...

__________________
2015 NC Regional Chairman's Award
2016 NC Guilford District Event Winner
2016 NC Guilford District Chairman's Award
2016 NC District Championship Winner
2016 NC Regional Chairman's Award
2016 NC Woodie Flowers Award Finalist - Lia Schwinghammer



Reply With Quote
  #20   Spotlight this post!  
Unread 28-07-2016, 14:06
pwnageNick's Avatar
pwnageNick pwnageNick is offline
It's like yeeee ho
AKA: Nick Coussens
FRC #2451 (PWNAGE)
Team Role: Mentor
 
Join Date: Jun 2010
Rookie Year: 2007
Location: Chicago, IL
Posts: 402
pwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond reputepwnageNick has a reputation beyond repute
Re: 6X 775 - 6X 1.625" Drive

Quote:
Originally Posted by Eric Scheuing View Post
Can we get a render of just the gearbox itself?

I'm also concerned with the gearbox mounting method. Would there be any issues with the fasteners bottoming out on each other before you can get a solid joint?
Quote:
Originally Posted by Greg Woelk
Are you referring to the in-line standoffs? Nick appears to be using the same standoffs-and-set-screws construction method that we used on the dozens of in-line standoffs in our robot's hood this year. I can assure you that the joints are plenty strong.
I actually used male/female threads for the 3/4" spacing between the 775 plate and inner-drive plate. This way all the standoffs can remain installed and to take off the motors you just loosen the 4 bolts on the end of that motor plate. I'm not a huge fan of set screws in-between standoffs. I know it can be done effectively but the amount of times I've had a set screw vibrate loose between standoffs in VEX has turned me away. This would be a nice set it and forget it setup.

Quote:
Originally Posted by Chris is me
Nick: Is this setup actually lighter than a traditional WCD with 3" wheels? With the thicker plate and the gears and stuff, I would be inclined to say probably not.
Short answer, no. It might save a little bit of weight but the amount you'd save is not worth all the tradeoffs you'd give up for this. I think trying to use these wheels proved to me there ends up being no benefit.

Quote:
Originally Posted by OccamzRazor
This is very interesting but I don't think those little wheels would hold up long unless you added more of them. Ground clearance isn't the issue with this design at all, our 2013 robot was .250 off the ground and carpet was not an issue even when rolling over the pyramid corner plates.

This is awesome, hilarious, creative, well done, and a lot of other things.

I just have to wonder...
I debated doubling up the wheels but decided that went against the whole point of the drive, which was to save weight (in theory). Plus you could either double up the wheels to elongate their life an unknown amount, or you could just swap them out every X matches. I'm not convinced I'd go through less wheels if I double up.

Yes, I definitely asked myself if I should... multiple times. Then I remembered it's July and I had two days off work with nothing better to do, and Bailey and Rahul had already done a solid single speed 775 gearbox, so I figured why bother with something simple like that, might as well have some fun.
__________________
FRC 2451: PWNAGE, Student/Team President (2009-2012)
FRC/VEX 2451: PWNAGE, Strategy/Design Mentor (2013-)
VEXU NAR: North American Robotics, Student/Chapter President (2013-)
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 17:14.

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