OCCRA
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Jared
Today 05:20 PM
One tool/machine to level up a moderate shop
An edgefinder in a drill chuck on a drill press (which likely isn't trammed as well as a mill would be) is unlikely to do any better than a few thousandths. You'll also need a really smooth x-y...
(2,476 views, 40 replies)
New Post
Zaque
Today 04:57 PM
Do you have a battery boi?
I don't know, I am sensing some resistance to a change in the flow of these puns.
(1,455 views, 23 replies)
New Post
orangemoore
Today 04:57 PM
Team A vs Team B
515 + 45 = 560
(381,489 views, 6,750 replies)
New Post
asid61
Today 04:30 PM
What would you like on a robot if time, money, or weight weren't a restriction?
Probably a two-speed swerve drive with PTO and ield centric gyros and gyros for collision detection/ avoidance, a localized AI to get around defense, full holonomic motion, all controlled via an...
(304 views, 3 replies)
New Post
asid61
Today 04:16 PM
pic: CV Robotics WCD 6wd Drivebase Prototype
If your gearbox is custom, you could make it in the 192 style. See their thread on their 2014 gearbox with the flipped cims.
(2,921 views, 39 replies)
New Thread
x86_4819
Today 03:10 PM
Teams who have used or plan to use python for Robot Code
I thought that this might be an interesting metric to see.
(52 views, 0 replies)
New Thread
magoldsm
Today 02:48 PM
Motor Controller Temporal Resolution
In Aerial Assist, the Lake Monsters used an electric catapult. Instead of a physical stop, we had software monitor the position of the catapult arm and apply full reverse power when the desired...
(62 views, 0 replies)
New Post
Mike Martus
Today 02:38 PM
Supporting Chief Delphi
Thanks for all the great offers regarding support for the ChiefDelphi.com site. Last year I phased out the support function for the site for several good reasons. The number 1 reason is that...
(4,150 views, 22 replies)
New Post
Al Skierkiewicz
Today 02:09 PM
CD's Unofficial Caption Contest #542
"Captain, if we stay on this trajectory, we will pass right through the black hole. Assuming, of course, that this map of the universe is correct."
(201 views, 9 replies)
New Post
jwfoss
Today 01:13 PM
FIRST Choice 2015 Window Open
I'm hoping this just means a new compressor is now in the kit, or that the rules have been opened up further on what is allowed for compressors.
(2,399 views, 31 replies)
New Post
AllenGregoryIV
Today 12:57 PM
Worst Deals in FIRST Choice
I agree that the prices went to a much more acceptable level for most items. Pneumatics last year were just crazy under valued, as the fitting bag was about 10x cheaper last year. I'm all in on the...
(1,392 views, 12 replies)
New Post
Peyton Yeung
Today 12:33 PM
pic: All Done!
This looks pretty similar http://firstchoicebyandymar k.com/fc15-039
(2,024 views, 15 replies)
New Post
DonRotolo
Today 12:16 PM
Structural Framing Strength?
40x40 is overkill for almost every application in FRC. That being said, the material is plenty strong, its weakness are where it connects together. Fasteners that depend on friction (such as T-nuts)...
(548 views, 9 replies)
New Post
dellagd
Today 12:00 PM
Physics Quiz 10
Ah, well even if I did find out the dimensions correctly I must have set up the proportion between the carpets velocity and the robot's orientation inversely. The solution below works out, so unless...
(881 views, 19 replies)
New Post
Jared
Today 11:45 AM
Design a forklift
It depends on what you're trying to accomplish. How much do you want to carry? How high do you want it to go? Does it need to collapse down to a low height? How fast must it go?
(396 views, 4 replies)
New Post
Ether
Today 11:44 AM
[OCCRA]: recomended PWM frequency for CIM motors?
Don, could you please provide link(s) to some technical articles discussing this as it applies to DC brushed motors?
(104 views, 3 replies)
New Post
DonRotolo
Today 11:25 AM
What's the best charging position for robot batteries?
Exactly: Charge upright so you vent gas in the unlikely instance of overpressure venting. Otherwise it makes no difference.
(583 views, 6 replies)
New Post
DonRotolo
Today 11:21 AM
Breaking in banebot motors
Running them in air will do the trick as well. Better than motors is to run in your gearboxes. Or both, as a pair. We start with about 2 Amperes, gradually increasing voltage to maintain 2A. Once...
(240 views, 2 replies)
New Post
Arpan
Today 11:08 AM
Exploding Weather Balloon
3061's "wholly owned subsidiary" physics club does these launches to fly middle and elementary schooler's experiments to space on a stabilizing frame. http://vimeo.com/42751486#t=1m32s is a cool...
(293 views, 2 replies)
New Post
sanelss
Today 11:03 AM
2015 FRC prototype two speed swerve drive first run
low gear is 16 to 1 and high gear is 8 to 1. with a 6" wheel. but as stated we can fine tune or drastically change that with changing the chain sprockets. we think we like these ratios though.
(660 views, 11 replies)

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