Go to Post FIRST has taught me to mind my semicolons. - ComradeNikolai [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

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #26   Spotlight this post!  
Unread 10-02-2003, 14:46
soezgg soezgg is offline
Senior Member
AKA: Harry Miller
#0639 (The Rude Awakening)
 
Join Date: Sep 2002
Location: The Army
Posts: 119
soezgg can only hope to improve
Send a message via AIM to soezgg Send a message via Yahoo to soezgg
haha.

It is clear that you guys are either uninformed on the subject of friction or confused.

You have to specify whether you are talking about static friction or kinetic friction.

In static friction, coefficients over 1 are easily possible.
Static friction in meaning means still, unmoving, not slipping. In kinetic friction, moving friction, a coefficient over 1 is practically impossible.

Both static and kinetic friction is applied in the case of robots, but you have to make sure you are using the right one.

Traction, also called adhesive friction is the same thing. The most dependant variable in traction (lets use this word because it puts more of a gripping image in ones mind) is the maximum static friction.

To determine max static friction between two surfaces, one must multiply the static coefficient of friction between the surfaces by the normal force (also the weight). The result of this is the maximum forward force that a robot can apply on a vertical surface (another robot or wall) before the wheels start slipping.

When the wheels slip this changes traction from static friction to kinetic friction and greatly lowers the amount of force that a robot can apply to actually push forward.

Its a little hard to explain in words. Wish I knew the coefficient of the wire mesh and hdpe. But you can determine that through testing (determining torque off wheels through motor and gearing/Fn). Havent done that yet.

Steve
Reply With Quote
 


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
White Paper Discuss: Drive Train Basics CD47-Bot Extra Discussion 6 06-09-2012 11:42
pic: Team 980 "Thunder Bot" drive train CD47-Bot Robot Showcase 12 25-02-2003 14:02
what's your most important drive train advice? Ken Leung Technical Discussion 42 07-01-2003 09:58
Another chapter in the drive train story AdamT Technical Discussion 19 29-09-2002 13:52
Blowing fuses/tuning drive train DougHogg Motors 10 23-06-2002 00:24


All times are GMT -5. The time now is 09:09.

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