Go to Post The terror level was lowered to MOE green for this event. - AdamHeard [more]
Home
Go Back   Chief Delphi > Technical > Motors
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
  #301   Spotlight this post!  
Unread 25-01-2012, 10:07
Taylor's Avatar
Taylor Taylor is offline
Professor of Thinkology, ThD
AKA: @taylorstem
FRC #3487 (Red Pride Robotics)
Team Role: Teacher
 
Join Date: Jan 2006
Rookie Year: 2006
Location: Indianapolis, IN, USA 46227
Posts: 4,609
Taylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond reputeTaylor has a reputation beyond repute
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by Ether View Post
My point was a bit too subtle I guess.

No, you're fine. I was a bit dense.

I was caught off guard by your dry sense of humor.
__________________
Hi!

Last edited by Taylor : 25-01-2012 at 10:50.
  #302   Spotlight this post!  
Unread 25-01-2012, 12:00
team222badbrad's Avatar
team222badbrad team222badbrad is offline
3D Printing Specialist
AKA: Bradley Rigdon
FRC #0222 (The Tigertrons)
Team Role: Mentor
 
Join Date: Sep 2001
Rookie Year: 2000
Location: Tunkhannock, PA
Posts: 1,091
team222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond repute
Send a message via AIM to team222badbrad
Re: Banebots RS-775 Case Short

It's just about time for some testing. Perhaps as soon as tonight.

Fresh out of one of my FDM machines!

__________________
Tigertrons are on Facebook!

http://www.printo3d.com

16th FIRST season for me.
  #303   Spotlight this post!  
Unread 25-01-2012, 12:05
Tristan Lall's Avatar
Tristan Lall Tristan Lall is offline
Registered User
FRC #0188 (Woburn Robotics)
 
Join Date: Aug 2001
Rookie Year: 1999
Location: Toronto, ON
Posts: 2,484
Tristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond repute
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by team222badbrad View Post
It's just about time for some testing. Perhaps as soon as tonight.

Fresh out of one of my FDM machines!
That looks like fun. What's the polymer you used?
  #304   Spotlight this post!  
Unread 25-01-2012, 12:19
team222badbrad's Avatar
team222badbrad team222badbrad is offline
3D Printing Specialist
AKA: Bradley Rigdon
FRC #0222 (The Tigertrons)
Team Role: Mentor
 
Join Date: Sep 2001
Rookie Year: 2000
Location: Tunkhannock, PA
Posts: 1,091
team222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond repute
Send a message via AIM to team222badbrad
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by Tristan Lall View Post
That looks like fun. What's the polymer you used?
ABS (Specifically P430) If you want more information about it check out stratasys.com or dimensionprinting.com
__________________
Tigertrons are on Facebook!

http://www.printo3d.com

16th FIRST season for me.
  #305   Spotlight this post!  
Unread 25-01-2012, 13:11
LH Machinist LH Machinist is offline
Registered User
no team
 
Join Date: Jan 2008
Location: North East
Posts: 48
LH Machinist has a spectacular aura aboutLH Machinist has a spectacular aura aboutLH Machinist has a spectacular aura about
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by team222badbrad View Post
It's just about time for some testing. Perhaps as soon as tonight.

Fresh out of one of my FDM machines!

Looks good! Are the spur gears a press fit?
  #306   Spotlight this post!  
Unread 25-01-2012, 15:51
team222badbrad's Avatar
team222badbrad team222badbrad is offline
3D Printing Specialist
AKA: Bradley Rigdon
FRC #0222 (The Tigertrons)
Team Role: Mentor
 
Join Date: Sep 2001
Rookie Year: 2000
Location: Tunkhannock, PA
Posts: 1,091
team222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond reputeteam222badbrad has a reputation beyond repute
Send a message via AIM to team222badbrad
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by LH Machinist View Post
Looks good! Are the spur gears a press fit?
No slip fit with a set screw.
__________________
Tigertrons are on Facebook!

http://www.printo3d.com

16th FIRST season for me.
  #307   Spotlight this post!  
Unread 25-01-2012, 17:21
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,519
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
Re: Banebots RS-775 Case Short

Gearbox looks fantastic. Now I want to get our 3D printer running. I could just as easily lasercut some plates and throw a couple standoffs in there though.
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004

Last edited by sanddrag : 25-01-2012 at 17:53.
  #308   Spotlight this post!  
Unread 25-01-2012, 17:48
waialua359's Avatar
waialua359 waialua359 is offline
Mentor
AKA: Glenn
FRC #0359 (Hawaiian Kids)
Team Role: Mentor
 
Join Date: Apr 2003
Rookie Year: 2000
Location: Waialua, HI
Posts: 3,324
waialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond repute
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by sanddrag View Post
Gearbox looks fantastic. Now I want to get our 3D printer running.
Same here. Ours should be ordered and coming in within the next 2 months. Too bad it'll be too late for this 2012 build season.
__________________

2016 Hawaii Regional #1 seed, IDesign, Safety Award
2016 NY Tech Valley Regional Champions, #1 seed, Innovation in Controls Award
2016 Lake Superior Regional Champions, #1 seed, Quality Award, Dean's List
2015 FRC Worlds-Carver Division Champions
2015 Hawaii Regional Champions, #1 seed.
2015 Australia Regional Champions, #2 seed, Engineering Excellence Award
2015 Inland Empire Regional Champions, #1 seed, Industrial Design Award
2014 OZARK Mountain Brawl Champions, #1 seed.
2014 Hawaii Regional Champions, #1 seed, UL Safety Award
2014 Dallas Regional Champions, #1 seed, Engineering Excellence Award
2014 Northern Lights Regional Champions, #1 seed, Entrepreneurship Award
2013 Championship Dean's List Winner
2013 Utah Regional Champion, #1 seed, KP&B Award, Deans List
2013 Boilermaker Regional Champion, #1 seed, Motorola Quality Award
2012 Lone Star Regional Champion, #1 seed, Motorola Quality Award
2012 Hawaii Regional Champions #1 seed, Motorola Quality Award
  #309   Spotlight this post!  
Unread 25-01-2012, 18:59
Nick Lawrence's Avatar
Nick Lawrence Nick Lawrence is offline
Commander Canada
FRC #3940 (CyberTooth, AndyMark)
Team Role: Mentor
 
Join Date: Mar 2009
Rookie Year: 2005
Location: Kokomo, IN
Posts: 714
Nick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond reputeNick Lawrence has a reputation beyond repute
Re: Banebots RS-775 Case Short

We will not be using RS-775 motors this year.

It's a risk we just can't take. However, we are using 550 motors for sure this year.

-Nick
__________________


Alumnus of 1503 Spartonics
Founding Mentor of 5406 Celt-X
Mechanical Design Mentor of 3940 CyberTooth
Emceeing events since 2013 - come say hi!

Success doesn't always equate to match wins. It's about the wins off the field.
  #310   Spotlight this post!  
Unread 25-01-2012, 19:14
Mk.32's Avatar
Mk.32 Mk.32 is offline
Registered User
AKA: Mark
FRC #2485 (W.A.R. Lords)
Team Role: Engineer
 
Join Date: Jan 2011
Rookie Year: 2011
Location: San Diego
Posts: 771
Mk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud ofMk.32 has much to be proud of
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by Nick Lawrence View Post
We will not be using RS-775 motors this year.

It's a risk we just can't take. However, we are using 550 motors for sure this year.

-Nick
Same with us.
Just need some of those p60s gearboxes...
__________________
Engineering mentor: Team 2485: WARLords 2013-

Team President: Team 3647 2010-2013
  #311   Spotlight this post!  
Unread 25-01-2012, 20:50
Richard Wallace's Avatar
Richard Wallace Richard Wallace is offline
I live for the details.
FRC #3620 (Average Joes)
Team Role: Engineer
 
Join Date: Jan 2003
Rookie Year: 1996
Location: Southwestern Michigan
Posts: 3,678
Richard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond reputeRichard Wallace has a reputation beyond repute
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by sanddrag View Post
I can see it now: 2013 rules: Teams are allowed to custom wind one motor of their own design and manufacturing methods.
This would be sweet.
__________________
Richard Wallace

Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
since 2003

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
  #312   Spotlight this post!  
Unread 25-01-2012, 21:35
waialua359's Avatar
waialua359 waialua359 is offline
Mentor
AKA: Glenn
FRC #0359 (Hawaiian Kids)
Team Role: Mentor
 
Join Date: Apr 2003
Rookie Year: 2000
Location: Waialua, HI
Posts: 3,324
waialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond reputewaialua359 has a reputation beyond repute
Re: Banebots RS-775 Case Short

Banebots called us today and asked for info on our testing, results, and motor info (printed on motors).
We found several so far that have the case shorts, yet when in use on our shooter with the CIM-U-Lator, have seen no ill effects as of yet.

Since they are willing to solve the issue and send us new ones, we plan on using them.
__________________

2016 Hawaii Regional #1 seed, IDesign, Safety Award
2016 NY Tech Valley Regional Champions, #1 seed, Innovation in Controls Award
2016 Lake Superior Regional Champions, #1 seed, Quality Award, Dean's List
2015 FRC Worlds-Carver Division Champions
2015 Hawaii Regional Champions, #1 seed.
2015 Australia Regional Champions, #2 seed, Engineering Excellence Award
2015 Inland Empire Regional Champions, #1 seed, Industrial Design Award
2014 OZARK Mountain Brawl Champions, #1 seed.
2014 Hawaii Regional Champions, #1 seed, UL Safety Award
2014 Dallas Regional Champions, #1 seed, Engineering Excellence Award
2014 Northern Lights Regional Champions, #1 seed, Entrepreneurship Award
2013 Championship Dean's List Winner
2013 Utah Regional Champion, #1 seed, KP&B Award, Deans List
2013 Boilermaker Regional Champion, #1 seed, Motorola Quality Award
2012 Lone Star Regional Champion, #1 seed, Motorola Quality Award
2012 Hawaii Regional Champions #1 seed, Motorola Quality Award
  #313   Spotlight this post!  
Unread 25-01-2012, 21:41
Joe Johnson's Avatar Unsung FIRST Hero
Joe Johnson Joe Johnson is offline
Engineer at Medrobotics
AKA: Dr. Joe
FRC #0088 (TJ2)
Team Role: Engineer
 
Join Date: May 2001
Rookie Year: 1996
Location: Raynham, MA
Posts: 2,648
Joe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond repute
Re: Banebots RS-775 Case Short

This is a very sad day. I had high hopes for those 775s. I heard that all that was in needful in this case was to electrically isolate the motor can.

I have access to a 3D printer and some mad CAD and engineering skills, so... ...I thought I was all set.

But, two things disappoint me.

First, that what appears to be a good motor is really a ticking time bomb in many cases.

Second, Banebots. I know that they are a small company. But they just don't seem to understand what it means to a team when a their hearts are broken by something outside of their control, all the more so when the problem was known by the source of the problem.

BB has had a year to try to get to the bottom of this issue. Sorting motors is better than nothing but it hardly seems like enough given the severity of the problem.

Banebots has been a great supported of FIRST. I love a lot of their products and I love their prices (if you don't count the cost of poor quality biting you in the back when you can least afford it).

But, I am disappointed.

Joe J.
__________________
Joseph M. Johnson, Ph.D., P.E.
Mentor
Team #88, TJ2
  #314   Spotlight this post!  
Unread 26-01-2012, 00:06
Tristan Lall's Avatar
Tristan Lall Tristan Lall is offline
Registered User
FRC #0188 (Woburn Robotics)
 
Join Date: Aug 2001
Rookie Year: 1999
Location: Toronto, ON
Posts: 2,484
Tristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond reputeTristan Lall has a reputation beyond repute
Re: Banebots RS-775 Case Short

Quote:
Originally Posted by sanddrag View Post
I can see it now: 2013 rules: Teams are allowed to custom wind one motor of their own design and manufacturing methods.
This is how arms races begin.

But then I got to thinking. Brushes? We don't need no stinkin' brushes! (If only we had a speed controller that would work.)

Quote:
Originally Posted by Richard View Post
This would be sweet.
It would be sweet seeing what you come up with, when mass-producability is thrown out the window. (Maybe not quite so sweet trying to beat you at your own game, though....)
  #315   Spotlight this post!  
Unread 26-01-2012, 08:00
Joe Johnson's Avatar Unsung FIRST Hero
Joe Johnson Joe Johnson is offline
Engineer at Medrobotics
AKA: Dr. Joe
FRC #0088 (TJ2)
Team Role: Engineer
 
Join Date: May 2001
Rookie Year: 1996
Location: Raynham, MA
Posts: 2,648
Joe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond reputeJoe Johnson has a reputation beyond repute
Re: Banebots RS-775 Case Short

I've slept on this problem. To use the BB775s or not to use them?

I really want to use them because they should be a great motor. I think that isolating the case (from anything, including other BB775s) will limit the damage to that one motor. If I am using 2 in parallel (e.g. in a large arm application), unless both fail in the same match, I can limp through the match with only degraded performance as a result.

But... ...I don't like to go this way unless I have some way of detecting the onset of the problem and changing it at the first sign of a problem.

Has anyone tried monitoring the voltage on the case live while the robot is in action?

I am thinking that I could have put connect the case to a resistor network. For example, I could put two relatively high resistors in series between the battery and ground and tie the case to the middle of these and monitor this voltage. This monitor voltage (i.e. the case) would sit at roughly 6-8V (1/2 battery) unless a short starts and then it would start going rail to rail 12V - gnd - 12V - gnd - ...

And this is when I would replace that motor.

What do people think of this scheme?

Joe J.
__________________
Joseph M. Johnson, Ph.D., P.E.
Mentor
Team #88, TJ2
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


All times are GMT -5. The time now is 13:32.

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