Go to Post Inspect every connection after every match. Use your eyes, ears and nose. - Al Skierkiewicz [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
Reload this Page Coefficient of Friction
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 28-12-2006, 15:41
Stu Bloom's Avatar
Stu Bloom Stu Bloom is offline
I REALLY want to be Andy Baker
FRC #1018 (RoboDevils)
Team Role: Mentor
  
Join Date: Dec 2002
Rookie Year: 2002
Location: Indianapolis, IN
Posts: 662
Stu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond repute
Send a message via AIM to Stu Bloom Send a message via Yahoo to Stu Bloom
Re: Coefficient of Friction
Quote:
Originally Posted by VEN View Post
can i take chromium on chromium friction and copper on copper friction and average it out?
I don't think that will work ... based on information from the table (website) referenced above:

Static Friction example:
Copper / Copper - 1.0 (my source "Marks Handbook" shows 1.21)
Mild Steel / Mild Steel - .74
Average would be .87, table says (Copper / Mild Steel) .53

Copper / Copper - 1.0
Cast Iron / Cast Iron - 1.1
Average - 1.05, table says 1.05 (WOW !) - except my source says Cu/Cu: 1.21

Anyway, that doesn't seem to be a reliable way to estimate the friction coefficient. Also, I am sure you are aware that MANY factors can affect your actual friction. Surface finish/roughness, Lubrication, Contamination, Oxidation ...

Your best bet is to experiment with samples of the material you are interested in and collect your own data (as Imajie just posted ).
__________________
Stuart Bloom
Mechanical Engineer
Rolls-Royce Corporation
FIRST Team 1018 - Pike HS RoboDevils
My activity for 2012:
  • Boilermaker planning committee
  • Israel Head Ref - DONE (and it was FANTASTIC!)
  • Boilermaker Regional (with 1018) - DONE
  • Midwest Head Ref - DONE
  • WORLD Championships (with 1018) - DONE
  • IRI Head Ref - DONE
  • CAGE Match Head Ref
  #2   Spotlight this post!  
Unread 28-12-2006, 19:27
Dick Linn's Avatar
Dick Linn Dick Linn is offline
Registered User
no team (Synergy)
  
Join Date: Jan 2003
Rookie Year: 2001
Location: Midlothian, VA
Posts: 679
Dick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond reputeDick Linn has a reputation beyond repute
Send a message via AIM to Dick Linn
Re: Coefficient of Friction
I second the experimental approach. Too many variables...
__________________
Richard Linn

Proud father of Marine LCpl. Karl R. Linn
Co-founder Team 975
KIA, Iraq 1/26/2005
  #3   Spotlight this post!  
Unread 28-12-2006, 20:02
Pavan Dave's Avatar
Pavan Dave Pavan Dave is offline
Busy in College
AKA: I am John Gault.
FRC #1745 (P-51 Mustangs) FRC #118 (Robonauts)
Team Role: Mentor
  
Join Date: Jan 2006
Rookie Year: 2006
Location: Richardson, Texas
Posts: 1,387
Pavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond reputePavan Dave has a reputation beyond repute
Send a message via AIM to Pavan Dave
Re: Coefficient of Friction
I should have paid more attention in physics.

Pavan.
__________________
Times change. People change. Teams change.
---
2008-Present: FRC1745, P51-Mustangs - Mentor
2005-2008: FRC118, Robonauts - Alumni
National Director of Philanthropy - Delta Epsilon Psi Fraternity, Inc.
1745 - 118 - ΔΕΨ
  #4   Spotlight this post!  
Unread 28-12-2006, 20:04
Tottanka's Avatar
Tottanka Tottanka is offline
It isnt about bots,its about humans
AKA: Liron Gurvitz
FRC #3211 (The Y Team)
Team Role: Mentor
  
Join Date: Dec 2006
Rookie Year: 2006
Location: Hadera, Israel
Posts: 1,418
Tottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond reputeTottanka has a reputation beyond repute
Re: Coefficient of Friction
Just make a test with ditance sensors =]
__________________
My FRC record: 10 Years,FTA (2008-9), 3 Teams(1947,2669,3211).3 RCA, 1 Championship EI(2016), 1 Divisional finalist (2016), 1 Regional winner.
Israeli 2016 Volunteer of the year.
  #5   Spotlight this post!  
Unread 28-12-2006, 20:40
VEN's Avatar
VEN VEN is offline
The future isn't what it used to be
AKA: Volodymyr
VRC #0478 (Mustang Robotics)
Team Role: Mentor
  
Join Date: Apr 2005
Rookie Year: 2004
Location: Richmond Hill, Ontario
Posts: 328
VEN is a name known to allVEN is a name known to allVEN is a name known to allVEN is a name known to allVEN is a name known to allVEN is a name known to all
Send a message via MSN to VEN
Re: Coefficient of Friction
Thanks for the input guys
  #6   Spotlight this post!  
Unread 30-12-2006, 18:36
Rob2713g's Avatar
Rob2713g Rob2713g is offline
Registered User
FRC #0540 (Screaming Eagles)
  
Join Date: Apr 2006
Rookie Year: 2004
Location: VA
Posts: 143
Rob2713g has a spectacular aura aboutRob2713g has a spectacular aura aboutRob2713g has a spectacular aura about
Re: Coefficient of Friction
Although I'm not sure how accurate this site is, it has Cu on Cr under "Coefficient of Friction" > "Table of friction Values for elements". Also it has some links at the bottom you may want to explore. Good Luck!
__________________

2007 - NASA/VCU Regional Winners (Thanks 2108 & 843!)
2006 - Championship Curie division
2006 - NASA/VCU Semi-Finalists (Thanks 510 & 587!)
2005 - NASA/VCU Quarter-Finalists (Thanks 388 & 619!)
Closed Thread

« Previous Thread | Portal | Next Thread »

Thread Tools
Display Modes Rate This Thread
Hybrid Mode Hybrid Mode
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
Coefficients of Friction JoelP Technical Discussion 19 28-05-2006 15:54
We attempt to work out the coefficient of drag on a boring sunday afternoon Bongle Math and Science 6 17-04-2006 08:04
Coefficient of friction of tetra suneel112 Kit & Additional Hardware 1 12-02-2005 15:40
Skyway Coefficient of Friction HPA_Robotics_13 Kit & Additional Hardware 1 25-01-2005 06:26
Coefficient of Frictions mzitz2k Technical Discussion 15 06-01-2004 20:16


All times are GMT -5. The time now is 04:17.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.

Contact Us - Chief Delphi - Rules - Archive - Top

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi