Go to Post Would FIRST be as amazing if not for CD? I mean it would still be this amazing place for students and mentors to be but the explosion of innovation and gathering of people together across communities has to have been greatly effected by CD. - dodar [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

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #10   Spotlight this post!  
Unread 28-03-2006, 22:21
Ianworld's Avatar
Ianworld Ianworld is offline
AKA Ian Ferguson
AKA: Ian Ferguson
FRC #0694 (StuyPulse)
Team Role: College Student
 
Join Date: Jan 2003
Rookie Year: 2002
Location: New York City, Stuyvesant H.S.
Posts: 366
Ianworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud ofIanworld has much to be proud of
Send a message via AIM to Ianworld
Re: The advantage of holonomic drivetrains

Many people here are getting confused between holonomic and swerve drives. A holonomic drive has 4 omni wheels at the corner of the robot rotated 90 degrees from each other. This allows the robot to effectively move in any direction and spin in place by powering each of the wheels independently a different amount. The reason why people have said that they are weak and easy to push around is because you can never have more than 50% of your power in any one direction. Along similar lines if the wheels are not being driven the robot can be slid across the ground very easily.

A mechanum drive is very similar to a holonomic drive in that it effectively works the same way. It uses complicated mechanum wheels which allow a robot to place its omni-wheels in a front to back configuration like a regular wheeled robot. It however doesn't pose any advantages other than the easier mounting I believe.

A swerve drive is a very different animal which is what the picture of the HOT bot from last year and the BEAST from this year use. They usually have 4 wheels which are rotatable. Usually driven by a motor the wheels are able to rotate in place allowing the robot to drive in any direction. The advantage of this is that you don't sacrifice much traction while gaining a lot of maneuverability. The downside comes in the form of extra motors, extra hardware and a lot of complexity.

As far as I've seen the competition has been dominated 6 wheel drive set ups and treads. Treads and swerve drives are definitely coming out as the top contenders. Treads for their dominance in terms of strength and immovability and swerve drives for being both maneuverable and strong. However teams with just 6" traction wheels from IFI are going to be doing just great this year.

As for the holonomic drives I've seen, they have all broken down under the stress of the competition. They're tough to make really sturdy and powerful and just don't seem up to snuff this year. Its too bad since they're really starting to become common and a bad year like this will slow their adoption I think.
__________________
Team Website
 


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
Red Advantage ? Krystine T. General Forum 90 16-06-2008 13:41
Holonomic drive and ramp robotaddict Technical Discussion 11 13-01-2006 16:57
CAD/Inventor Drawings for Drivetrains twolf Inventor 10 21-11-2005 12:17
Holonomic Drive Question Jeff Waegelin Technical Discussion 12 20-11-2005 21:23
Holonomic... Greg Perkins Technical Discussion 2 02-02-2005 11:59


All times are GMT -5. The time now is 06:13.

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