Go to Post I'm a product of the 60's and react accordingly...I have an entire portion of my brain filled with song lyrics from the 60's and 70's which causes me to not have room for important stuff like motors, pneumatics, electrical system and green lights... - RoboMom [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 18-04-2011, 19:28
Brandon Holley's Avatar
Brandon Holley Brandon Holley is offline
Chase perfection. Catch excellence.
AKA: Let's bring CD back to the way it used to be
FRC #0125 (NU-TRONs, Team #11 Alumni (GO MORT))
Team Role: Engineer
 
Join Date: Jan 2004
Rookie Year: 2001
Location: Boston, MA
Posts: 2,593
Brandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond repute
Send a message via AIM to Brandon Holley
Re: Minibot magnets ?

Quote:
Originally Posted by Ether View Post
Here's a curve of K&J's 44 pound BY0X04-N52 magnet. At 1/16" (0.0625") it's only 2 pounds.

Could you post a part number for your magnet please.

You've read the chart incorrectly. At 0.6" it's 2 lbs, it's considerably stronger at 0.0625".


K&J offers a calculator online as well to help determine pull force based on magnet size and distance from the pole.

-Brando
__________________
MORT (Team 11) '01-'05 :
-2005 New Jersey Regional Chairman's Award Winners
-2013 MORT Hall of Fame Inductee

NUTRONs (Team 125) '05-???
2007 Boston Regional Winners
2008 & 2009 Boston Regional Driving Tomorrow's Technology Award
2010 Boston Regional Creativity Award
2011 Bayou Regional Finalists, Innovation in Control Award, Boston Regional Finalists, Industrial Design Award
2012 New York City Regional Winners, Boston Regional Finalists, IRI Mentor of the Year
2013 Orlando Regional Finalists, Industrial Design Award, Boston Regional Winners, Pine Tree Regional Finalists
2014 Rhode Island District Winners, Excellence in Engineering Award, Northeastern University District Winners, Industrial Design Award, Pine Tree District Chairman's Award, Pine Tree District Winners
2015 South Florida Regional Chairman's Award, NU District Winners, NEDCMP Industrial Design Award, Hopper Division Finalists, Hopper/Newton Gracious Professionalism Award
Reply With Quote
  #17   Spotlight this post!  
Unread 18-04-2011, 19:41
thefro526's Avatar
thefro526 thefro526 is offline
Mentor for Hire.
AKA: Dustin Benedict
no team (EWCP, MAR, FRC 708)
Team Role: Mentor
 
Join Date: Aug 2006
Rookie Year: 2005
Location: New Jersey
Posts: 2,599
thefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond repute
Send a message via AIM to thefro526 Send a message via MSN to thefro526
Re: Minibot magnets ?

Quote:
Originally Posted by Ether View Post
Here's a curve of K&J's 44 pound BY0X04-N52 magnet. At 1/16" (0.0625") it's only 2 pounds.

Could you post a part number for your magnet please.

McMaster-Carr Part Number: 7061T11

The magnet was spaced approximately .0625" away from the pole and was more than strong enough to hold our 2.3lb minibot on the pole, though I'd suggest decreasing the spacing to approximately .04" to make the attachment to the pole a little stronger, our minibot liked to fall off on it's way down - sure was fast though.
__________________
-Dustin Benedict
2005-2012 - Student & Mentor FRC 816
2012-2014 - Technical Mentor, 2014 Drive Coach FRC 341
Current - Mentor FRC 2729, FRC 708
Reply With Quote
  #18   Spotlight this post!  
Unread 18-04-2011, 20:12
Ether's Avatar
Ether Ether is offline
systems engineer (retired)
no team
 
Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,124
Ether has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond repute
Re: Minibot magnets ?

Quote:
Originally Posted by Brandon Holley View Post
You've read the chart incorrectly. At 0.6" it's 2 lbs, it's considerably stronger at 0.0625"
Yup, you're right. That's what I get for multitasking.


Reply With Quote
  #19   Spotlight this post!  
Unread 18-04-2011, 22:32
Unsung FIRST Hero
Mike Betts Mike Betts is offline
Electrical Engineer
no team
Team Role: Engineer
 
Join Date: Dec 2001
Rookie Year: 1995
Location: Homosassa, FL
Posts: 1,442
Mike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond reputeMike Betts has a reputation beyond repute
Re: Minibot magnets ?

Quote:
Originally Posted by jvriezen View Post
Be careful about using hard drive magnets. If they are encased in some other material designed to mount it to the drive that isn't a legal mini-bot part, you might have trouble.

I believe I also read somewhere here early on in the season that technically using a hard drive magnet means you are using a COTS component (the entire hard drive or the device it came from) and then modifying it (stripping it down to just the magnets) and that technically is not allowed, because Hard Drives are not permitted on the mini-bot. I know it sounds weird, but if you want to be uber-safe, buy a magnet alone, rather than scavenging one out of something else. I doubt a nickel coating or other similar coating that comes with a COTS magnet would be an issue, just because its not entirely a magnet.

There is a chance approaching 1 in 4 that I'll be inspecting your mini bot in St. Louis. I'll be asking deferring to my LRI about questionable minibots, however, (especially if you ask me to!)

John Vriezen
Team 2530 "Inconceivable"
Mentor, Drive coach, Inspector
John,

The rules do not specify where the magnet comes from. Also, the GDC ruled on hard drive magnets specifically here.

Regards,

Mike
__________________
Mike Betts

Alumnus, Team 3518, Panthrobots, 2011
Alumnus, Team 177, Bobcat Robotics, 1995 - 2010
LRI, Connecticut Regional, 2007-2010
LRI, WPI Regional, 2009 - 2010
RI, South Florida Regional, 2012 - 2013

As easy as 355/113...
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 05:38.

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