Go to Post Your not a robot (and they aren't perfect either) - Conor Ryan [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

 
Closed Thread
 
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 10-03-2009, 16:46
Bob Steele's Avatar
Bob Steele Bob Steele is offline
Professional Steamacrit Hunter
AKA: Bob Steele
FRC #1983 (Skunk Works Robotics)
Team Role: Coach
 
Join Date: Jan 2003
Rookie Year: 2002
Location: Seattle, Washington
Posts: 1,514
Bob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond repute
Re: Swerve Comments

This is similar to our Skunkswerve this year. One thing you might think about is how you will achieve alignment when you are adjusting your pots...
We steer front and rear the same... our modules have holes drilled in them for alignmnet rods to be placed so all four wheels can be put exactly in alignment with each other so we can align our pots for control...

it is a simple thing to put the holes in during the manufacturing process... much harder to do it after the fact...

thanks to our design team... we put them in early... along with a hole for a chain tensioner... (but we didn't need it..)

Our drive is really a hybrid between crab and swerve... similar to what Al was talking about...
__________________
Raisbeck Aviation High School TEAM 1983 - Seattle, Washington
Las Vegas 07 WINNER w/ 1425/254...Seattle 08 WINNER w/ 2046/949.. Oregon 09 WINNER w/1318/2635..SEA 10 RCA ..Spokane 12 WINNER w/2122/4082 and RCA...Central Wa 13 WINNER w/1425/753..Seattle 13 WINNER w/948/492 & RCA ..Spokane 13 WINNER w/2471/4125.. Spokane 14 - DCA --Auburn 14 - WINNER w/1318/4960..District CMP 14 WINNER w/1318/2907, District CMA.. CMP 14 Newton Finalist w 971/341/3147 ... Auburn Mountainview 15 WINNER w/1318/3049 - Mt Vernon 15 WINNER w/1318/4654 - Philomath 15 WINNER w/955/847 -District CMP 15 WINNER w/955/2930 & District CMA -CMP Newton -Industrial Design Award

  #2   Spotlight this post!  
Unread 10-03-2009, 17:51
Team1710's Avatar
Team1710 Team1710 is offline
Registered User
FRC #1710
 
Join Date: Jan 2009
Rookie Year: 2007
Location: Kansas City
Posts: 95
Team1710 is an unknown quantity at this point
Re: Swerve Comments

Quote:
Originally Posted by Bob Steele View Post
This is similar to our Skunkswerve this year. One thing you might think about is how you will achieve alignment when you are adjusting your pots...
We steer front and rear the same... our modules have holes drilled in them for alignmnet rods to be placed so all four wheels can be put exactly in alignment with each other so we can align our pots for control...

it is a simple thing to put the holes in during the manufacturing process... much harder to do it after the fact...

thanks to our design team... we put them in early... along with a hole for a chain tensioner... (but we didn't need it..)

Our drive is really a hybrid between crab and swerve... similar to what Al was talking about...
What do you mean by alignment rods?
  #3   Spotlight this post!  
Unread 10-03-2009, 18:07
Bob Steele's Avatar
Bob Steele Bob Steele is offline
Professional Steamacrit Hunter
AKA: Bob Steele
FRC #1983 (Skunk Works Robotics)
Team Role: Coach
 
Join Date: Jan 2003
Rookie Year: 2002
Location: Seattle, Washington
Posts: 1,514
Bob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond reputeBob Steele has a reputation beyond repute
Re: Swerve Comments

When we align the potentiometers that we use for the control algorithm we need to make sure all wheels are pointing exactly in the same direction. We do this by putting steel rods through holes in the swerve modules. These holes are drilled perpendicular to the module in two directions. We put 3 rods in and all the modules are lined up squarely with each other....all pointing the same direction... then we set the pot values to the same for each of them.

After this alignment we now have the same pot value for each wheel so that when the robot interface gets this feedback from the wheel it can keep each wheel facing in the same direction..

We also can, therefore use the calibration of the pots to change all wheels to face a different direction... or each wheel to face a different direction.

The alignment allows us to have an initial frame of reference for all the wheels..

I hope this helps you see what we are doing...
  #4   Spotlight this post!  
Unread 10-03-2009, 18:24
big1boom big1boom is offline
Chains=Fun
FRC #2022 (Titan Robotics)
Team Role: Alumni
 
Join Date: Jan 2009
Rookie Year: 2007
Location: Aurora
Posts: 267
big1boom is a glorious beacon of lightbig1boom is a glorious beacon of lightbig1boom is a glorious beacon of lightbig1boom is a glorious beacon of lightbig1boom is a glorious beacon of lightbig1boom is a glorious beacon of light
Re: Swerve Comments

We just visually lined up the wheelbox's.
__________________
  #5   Spotlight this post!  
Unread 10-03-2009, 18:24
Team1710's Avatar
Team1710 Team1710 is offline
Registered User
FRC #1710
 
Join Date: Jan 2009
Rookie Year: 2007
Location: Kansas City
Posts: 95
Team1710 is an unknown quantity at this point
Re: Swerve Comments

Yeah now I understand you. Yeah I'll take that into consideration. Thanks again for the help.
Closed Thread


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
My comments on shooters Woody1458 General Forum 54 26-02-2008 21:27
Comments on FIRSTclipse Astronouth7303 Programming 1 20-02-2007 07:29
Website Comments SamC Website Design/Showcase 2 29-07-2006 09:36
Comments Astronouth7303 Programming 4 18-01-2004 23:14
Comments to FIRST archiver 1999 3 23-06-2002 22:50


All times are GMT -5. The time now is 07:20.

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