Forum: FIRSTwiki
06-05-2007, 11:45 AM
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Replies: 20
Views: 3,805
Re: [wiki]: Renew domain name?
Sorry about that guys. It should be working within 24 hours or so. Someone had been taking care of the domain name for me for the past few years so I had not been making sure it was renewed. I...
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Forum: Technical Discussion
01-20-2006, 04:07 PM
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Replies: 11
Views: 1,668
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Forum: Technical Discussion
01-16-2006, 05:07 PM
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Replies: 18
Views: 2,544
Re: Poof Ball Dynamics
We have been testing the same mechanism and discovered much the same effect (more highly compressed balls shoot significantly faster). I believe this is due to slippage when the normal force is not...
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Forum: Pneumatics
01-15-2006, 02:49 PM
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Replies: 23
Views: 3,689
Re: Turbulence
That's probably 7 amps at 120V or about 840 watts. You almost had me thinking this was a feasible idea...
Additionally, that may be a high acceleration, but a ball travelling at 10m/s passing...
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Forum: Technical Discussion
01-12-2006, 06:36 PM
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Replies: 4
Views: 1,249
Conveyor belts
We are looking to build a conveyor belt to transfer balls. I have found a variety of conveyor belting on McMaster-Carr, but I'm having a hard time finding appropriate rollers for the belting. Are...
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Forum: Motors
01-12-2006, 02:23 AM
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Replies: 18
Views: 2,016
Re: Poll: CIM vs. Bike Motor?
A set screw is probably the simplest method (use two or three set screws if you want). I don't have numbers on it, but I think you can get sufficient torque transfer with it. But, if you insist,...
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Forum: Technical Discussion
01-11-2006, 10:13 PM
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Replies: 1
Views: 1,205
AndyMark shifter feedback
Our team is interested in purchasing the AM shifters for this season, so I'm looking for feedback from people who used them the previous year. I have searched and found a few positive comments from...
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Forum: Technical Discussion
01-11-2006, 05:38 PM
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Replies: 7
Views: 871
Re: 4WD, is it legal?
In general, you can do whatever you like in the construction of FIRST robots. The main rules, the ones that anyone designing the robot will need to know by heart, are:
weight limits
size...
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Forum: Extra Discussion
01-10-2006, 11:15 PM
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Replies: 11
Views: 2,881
Re: pic: TechTigers shooting prototype
I'm also very interested in seeing the video and it appears broken to me, too.
By my estimates, at 500 rpm, you should be shooting at around 1/2 (17fps or so) of the max velocity allowed. Is that...
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Forum: General Forum
01-10-2006, 11:13 AM
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Replies: 9
Views: 1,660
Re: Minimum Clearance?
One issue that Eric and I didn't consider at first but is certainly important is that you need to look at the clearance between not just in the side view, but also in the front view of the robot. ...
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Forum: Website Design/Showcase
05-12-2005, 08:36 PM
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Replies: 2
Views: 871
Re: Anyone use e107 CMS
Just on the off chance that you haven't seen it, this is probably the best place to ask: http://e107.org/e107_plugins/forum/forum.php
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Forum: CD Forum Support
05-12-2005, 07:21 PM
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Replies: 27
Views: 1,895
Re: Resolution, part II.
What was the reasoning behind moving to a fixed width? Seems like it won't do much good for anyone and annoy some.
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Forum: Kit & Additional Hardware
05-12-2005, 10:50 AM
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Replies: 50
Views: 5,503
Re: which is better aluminum or steel????
In general, in material science, you want to maximize one property while minimizing another; in the case of the chassis of a FIRST robot, the two important properties are weight and stiffness....
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Forum: Technical Discussion
05-09-2005, 06:26 PM
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Replies: 13
Views: 1,566
Re: how thin is too thin?
Yes, Sanddrag, you can certainly clamp a gear on the CIM shaft safely. We, and many other teams have done it. I think clamping is one of the most under used ways (in FIRST) to attach stuff to shafts....
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Forum: Dean Kamen's Inventions
05-03-2005, 09:59 AM
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Replies: 8
Views: 1,241
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Forum: Motors
05-01-2005, 12:50 AM
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Replies: 13
Views: 1,491
Re: servos
I imagine the sensor that provides feedback in a servo is a potentiometer. What exactly don't you like about them? The idea of using a servo as a sensor is certainly going to be a lot more work. ...
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Forum: Math and Science
04-30-2005, 04:42 PM
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Replies: 51
Views: 7,501
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Forum: Math and Science
04-30-2005, 04:32 PM
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Replies: 28
Views: 2,505
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Forum: Robot Showcase
04-29-2005, 01:30 PM
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Replies: 17
Views: 4,698
Re: pic: Reworked AndyMark Gearbox
That is really cool. I am surprised A&M didn't sell a servo shift version. Was it difficult to adapt one? Also, how much weight did you save with the modifications and removing the cylinder?
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Forum: Extra Discussion
04-27-2005, 07:11 PM
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Replies: 6
Views: 1,256
Re: pic: GO CHRISTINE!
Hahaha, I want to see that pic. Me and another kid on our team were joking that Christine has rocknthehawk (that's what we actually called you :) ) beat. Those spikes were pretty $@#$@#$@#$@#...
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Forum: FRC Game Design
04-27-2005, 04:37 PM
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Replies: 138
Views: 28,775
Re: Lessons learned 2005: The negative
Having discussed this with her, let me try to clarify Ally's post: She is not opposed to teams showing their appreciation for other's success. What she, and I, think is inappropriate is for team...
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Forum: FRC Game Design
04-25-2005, 03:43 PM
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Replies: 65
Views: 4,362
Re: 3 Teams Per Side Too Many?
3v3 is fun, allows more interesting strategies, and helps FIRST handle more teams. My only complaint is that it makes watching the game worse. It is hard enough to follow 4 robots playing, with...
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Forum: Extra Discussion
04-25-2005, 02:41 PM
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Replies: 6
Views: 1,256
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Forum: Robotics Education and Curriculum
04-19-2005, 07:12 PM
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Replies: 12
Views: 2,356
Re: Electronic Speed Controllers for DC Motor
It's only 1 amp and its the approximately the correct voltage so I wonder if you could drive it directly from the pwm? I don't really know the properties of the pwm signal, but if it goes from a...
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Forum: Chit-Chat
04-10-2005, 09:40 PM
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Replies: 16
Views: 1,074
Re: One for you audio folks...
I am still unsure of what you are trying to record, so this may not apply. The "best" way to do it would be to record each source independently then mix them later in an audio editing program (I...
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Engineers crave and demand facts, and won't reach a conclusion without them. - Richard Wallace [more] 
