Date: Wed, 6 Feb 2002 02:09:54 EST
Subject: Fwd: [FRCtech2002] Digest Number 36


There are 6 messages in this issue.

Topics in this digest:

      1. RE: Re: Casters
           From: "Murray, Chris" <cmurray@cguhs.org>
      2. Logo Dimentions
           From: "sarah_kerrigan_sc" <sarah_kerrigan_sc@yahoo.com>
      3. Pneumatics fax orders 2/1 before noontime
           From: FIRST Team Support <frcteams@usfirst.org>
      4. Battery question...
           From: "cbp952" <cbp952@yahoo.com>
      5. Re: Battery question...
           From: "frcengineers" <frcengineers@yahoo.com>
      6. RE: motor and fuses
           From: "frcengineers" <frcengineers@yahoo.com>


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Message: 1
   Date: Fri, 1 Feb 2002 10:12:33 -0700
   From: "Murray, Chris" <cmurray@cguhs.org>
Subject: RE: Re: Casters

Fastenal is checking, but the part numberr is not one that their system
recognizes. Perhaps this was a special order from corporate for FIRST and
the caster has another numberr for regular customers.
Chris Murray Team 996

-----Original Message-----
From: frcengineers [mailto:frcengineers@yahoo.com]
Sent: Thursday, January 31, 2002 1:43 PM
To: FRCtech2002@yahoogroups.com
Subject: [FRCtech2002] Re: Casters



> Small Parts' catalog doesn't show the caster we received in our 
boxes.
> Fastenal is a supplier of casters, but I haven't found that specific 
model.
> a.) What is the specific part number for the caster? 

A) The specific part number for the caster is 10247-00715

b.) Is it in Fastenal's or Small Parts' catalog? 

A) Fastenal is the supplier of the caster, I am not sure if it is 
their catalog.

c.) Is that specific caster 
handled by any chains like Loew's or Home Depot?

A)Not sure, you will have to hunt around for it.

---
FIRST MRT




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Message: 2
   Date: Fri, 01 Feb 2002 17:33:53 -0000
   From: "sarah_kerrigan_sc" <sarah_kerrigan_sc@yahoo.com>
Subject: Logo Dimentions

I've checked the manual, and have searched the website, but i have 
been unable to find the restrictions for the size of the logo that 
appears on the robot. I'm unsure on how large or how small it has to 
be, all i do know is that it has to be visible, which is not specific 
enough for our team. If anyone has the dimentions on the limits of 
how large or how small the team name, number and robot name on the 
robot has to be please respond soon.




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Message: 3
   Date: Tue, 05 Feb 2002 12:59:26 -0500
   From: FIRST Team Support <frcteams@usfirst.org>
Subject: Pneumatics fax orders 2/1 before noontime

The fax machine at HPE was down on Friday 2/1 up until noontime EST. If you 
faxed an order to them that morning, they may not have received it, and you 
should doublecheck with HPE.




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Message: 4
   Date: Tue, 05 Feb 2002 19:57:05 -0000
   From: "cbp952" <cbp952@yahoo.com>
Subject: Battery question...

We are provided with two batteries in the kit of parts. Realizing 
that only one battery may be used to power the robot during a match, 
is it permissible to have the 2nd battery on board the robot strictly 
as ballast?




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Message: 5
   Date: Tue, 05 Feb 2002 22:01:18 -0000
   From: "frcengineers" <frcengineers@yahoo.com>
Subject: Re: Battery question...

--- In FRCtech2002@y..., "cbp952" <cbp952@y...> wrote:
> We are provided with two batteries in the kit of parts. Realizing 
> that only one battery may be used to power the robot during a match, 
> is it permissible to have the 2nd battery on board the robot 
strictly 
> as ballast?

A) No.  See rule K9.

---
FIRST MRT




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Message: 6
   Date: Tue, 05 Feb 2002 22:36:49 -0000
   From: "frcengineers" <frcengineers@yahoo.com>
Subject: RE: motor and fuses

Hello

Q:                 We have big problem with a motor, speed controller
                 and/or fuses. We decided to use tracks as our drive
                 system. To power that we are using big 200W motors.
                 After few tests we have discovered that one of the
                 motors is being constantly cut off after no more than
                 30 seconds of working . We have investigated the
                 problem and discovered that 30A fuse goes off each
                 time. We have replaced all parts including speed
                 controller ,  fuses and wires but nothing has 
changed.
                 We have even connected for a while  the speed
                 controller to two 30A fuses but this didn't help
                 either. 
                 Next step is connecting two speed controllers to the
                 same motor so we could send to the motor 60A current
                 from two fuses but we are not sure if this will help.
                 This motor gets extremely hot very fast (on 30A
                 current) and we are wondering if this isn't
                 malfunction of the motor itself. We are also using 
the
                 second motor to power the other track and this one
                 works fine despite the fact that it's connected in 
the
                 same way. We would be grateful for any hints....

                 Piotr  Perczynski
                 group 704

A: #1, DO NOT CONNECT TWO SPEED CONTROLLERS TO ONE MOTOR as this is 
not allowed and will likely burn up both speed controllers.

#2, Track drive systems like this are notorious power hogs when 
turning. Look for extra friction in that side, if it's only one side 
you're having trouble with. Refer to section 1.2.1 of The Robot, 
there's a 2 page section discussing tips on working with large 
motors. If it turns out to be a defective motor, we can replace it for 
you but only if it was shipped that way.

-MW




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