Forum: Electrical
02-14-2016, 07:15 PM
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Replies: 64
Views: 3,949
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Forum: Robot Showcase
02-14-2016, 07:14 PM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
We are not sure yet, definitely going to test it thoroughly. We do have some contingency plans if it doesn't work though. The wiring is secured in a few key locations aside from the Velcro.
And...
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Forum: General Forum
02-14-2016, 02:44 PM
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Replies: 11
Views: 2,205
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Forum: Robot Showcase
02-14-2016, 10:59 AM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
:)
Thanks! That means a lot to us. It is something that our founding mentors believed in strongly.
Thank you! It is what we strive for, at least in baby steps. And good luck to the Rocketeers!
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Forum: Robot Showcase
02-13-2016, 08:38 PM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
We did use the guide. We are right on the edge of what is advisable for the versaplanetary with a mini-cim. During normal operation we will be nowhere near the stall limit of the mini-Cim. Flipping...
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Forum: Electrical
02-13-2016, 05:56 PM
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Replies: 64
Views: 3,949
Re: Twitchy Motors
What terminals are you using for the 6awg connections?
Is there any wiggle in any of the 6awg connections?
Is there any wiggle in any of the PCM/robot controller hookups?
Have you run a load test on...
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Forum: Robot Showcase
02-13-2016, 05:21 PM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
A few pictures from today:
The shooter is nominally populated with belts and rollers and stuck on the robot!
http://i.imgur.com/QK4QGSx.jpg
How he'll be able to fit under the low bar....
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Forum: Electrical
02-13-2016, 05:06 PM
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Replies: 64
Views: 3,949
Re: Twitchy Motors
Voltage dropping that low in such a 'spikey' shape screams main power issue or battery issue.
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Forum: Electrical
02-12-2016, 07:13 PM
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Replies: 64
Views: 3,949
Re: Twitchy Motors
Check main power connections and battery/battery voltage.
(didn't read the whole thread, this has been the cause of many a twitchy motor though...)
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Forum: General Forum
02-11-2016, 06:23 PM
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Replies: 11
Views: 2,205
Re: HELP!!!!!!!!!: Arm Lifting
At first blush a CIM connected 64:1 to a collector mechanism doesn't strike me as scary.
0) Counter-balance the mechanism with a spring or air cylinder (one should generally do this no matter what...
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Forum: Robot Showcase
02-11-2016, 06:07 PM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
A close-up of the shooter.
http://i.imgur.com/TVdJB4M.jpg
It's a bit... different... than most shooters we've seen before. We've setup the first 'booster' stage (3/4 of the length) to ramp up in...
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Forum: Robot Showcase
02-11-2016, 06:05 PM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
Picture of our chain tension cams. I'm told they look like ninja ghosts...
http://i.imgur.com/R2fDD6o.jpg
... kissing ninja ghosts.
A shot down the inside of a drive...
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Forum: Robot Showcase
02-11-2016, 01:37 PM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
Thanks!
Winner winner, chicken dinner. I'm going to post a picture of our chain tension cams tonight.
Thank you very much! Watching the chassis flex +/- 3 or 4 inches per side, then restore to...
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Forum: Robot Showcase
02-11-2016, 01:09 PM
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Replies: 43
Views: 12,299
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Forum: Robot Showcase
02-11-2016, 12:54 PM
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Replies: 43
Views: 12,299
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Forum: Robot Showcase
02-11-2016, 09:45 AM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
Also, without electronics, our chassis is coming in at 65lbs.
Our shooter structure is coming in at 13lbs (no motors/shafts/pulleys/belts).
We anticipate being around 100-110lbs fully dressed.
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Forum: Robot Showcase
02-11-2016, 09:44 AM
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Replies: 43
Views: 12,299
Re: FRC 95, The Grasshoppers, Build Thread
The 'booster' stage of the shooter is 1:1 on 775s. Our software/controls team advises me that the Talon SRX input can handle something above 100krpm with those encoders. I didn't do the math myself...
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Forum: Robot Showcase
02-10-2016, 06:07 PM
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Replies: 43
Views: 12,299
FRC 95, The Grasshoppers, Build Thread
Super-duper late start this year, but here we are!
We took a more 'main stream' approach this year than in many past years, but of course we had to make a few things a bit different.
Chassis is...
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Forum: General Forum
02-09-2016, 03:20 PM
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Replies: 49
Views: 8,407
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Forum: General Forum
02-08-2016, 12:07 PM
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Replies: 49
Views: 8,407
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Forum: Technical Discussion
02-05-2016, 07:56 PM
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Replies: 6
Views: 1,387
Re: 7075 sheet metal
You never mentioned what temper the 7075 is. Might make a difference...
I found this bend radius table that shows workable bend radii for 7075 sheet products....
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Forum: Motors
02-01-2016, 06:48 PM
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Replies: 14
Views: 2,042
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Forum: General Forum
01-29-2016, 04:59 PM
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Replies: 49
Views: 8,407
Re: Andymark rhino drivetrain discussion
The eyelets in the turnbuckles are aluminum? What alloy?
They appear as zinc-plated steel eyelets with an aluminum body, but you would of course know better!
Posting test videos would be a great...
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Forum: General Forum
01-29-2016, 10:07 AM
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Replies: 49
Views: 8,407
Re: Andymark rhino drivetrain discussion
I know that the turnbuckles are in compression, which is what concerns me. It may be fine as-is, but the 2 grams of mass it would take to weld it closed seem more than worth it to me.
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Forum: General Forum
01-29-2016, 09:30 AM
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Replies: 49
Views: 8,407
Re: Andymark rhino drivetrain discussion
Therein lies the rub.
An open-field pin, or more precisely: an open field t-bone, doesn't require a high-speed impact. All it requires is a defender applying steady pressure to the side of another...
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