Forum: General Forum
21-12-2016, 10:59
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Replies: 38
Views: 2,162
Re: Belts 9mm or 15mm?
This.
If you aren't direct driving a 6wd center wheel with a transmission, I would not recommended using 9mm wide belts. That is the only drive configuration that would make them manageable. If...
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Forum: Technical Discussion
18-11-2016, 22:00
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Replies: 18
Views: 1,377
Re: Drivetrain Sprocket
If you want to look at the math of the kind of loads chains or belts take and design the system appropriately, you can take a look here:
https://www.chiefdelphi.com/media/papers/3292
I stepped...
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Forum: General Forum
09-09-2016, 10:48
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Replies: 350
Views: 23,768
Re: [FIRST EMAIL] Stop Build Day Survey
I think these are two great points on this subject:
The following is just from my own observations from watching competitions over the years in a district system.
I think there are teams out...
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Forum: General Forum
07-09-2016, 10:24
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Replies: 350
Views: 23,768
Re: [FIRST EMAIL] Stop Build Day Survey
One thing I haven't seen mentioned was stress on machining sponsors. Eliminating bag and tag would reduce stress on machine sponsors as well.
The team I helped with had access to manual mills and...
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Forum: Extra Discussion
22-07-2016, 10:33
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Replies: 13
Views: 1,244
Re: pic: Experimental VP drive gearbox
Another thing to consider when going through these exercises is that generally a planetary gear system will be less efficient than a spur gear system.
This may not always be the case, but there are...
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Forum: General Forum
21-07-2016, 13:42
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Replies: 8
Views: 2,205
Re: [FRC Blog] Where is FIRST going?
For FRC in FiM, we are around 25% for team to school percentage. (411 teams / 1575 high schools). I think it may be more because many teams host multiple high schools, but a few do have multiple...
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Forum: Extra Discussion
21-07-2016, 10:45
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Replies: 26
Views: 2,614
Re: pic: 25lb Drivetrain
Think of the belly pan like a bunch of strings or cables attached and tied everywhere at the base. It provides additional stiffness when the frame moves away from the belly pan and creates tension,...
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Forum: General Forum
12-07-2016, 08:29
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Replies: 82
Views: 5,951
Re: Chain vs. Belts?!?
Both chain and belt are legitimate forms of power transfer and can be used successfully with proper implementation.
My personal preference is chain for low speed high torque applications, such as...
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Forum: General Forum
30-04-2016, 09:58
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Replies: 73
Views: 14,190
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Forum: General Forum
29-03-2016, 19:18
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Replies: 24
Views: 2,685
Re: Boulder inconsistency issue
There are ways to shoot the ball where the inconsistencies from ball to ball don't affect the trajectory. Keep playing with grip, speed, ball centering, and compression and I'm sure you'll find...
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Forum: Robot Showcase
23-02-2016, 12:47
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Replies: 8
Views: 2,842
Re: Sultans of Turkiye #2905 Robot Reveal
Looks good! Hopefully we can see your team at champs again.
Does the front of your robot meet the 8" minimum length requirement for the bumpers? They look on the skinny side of 8 inches.
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Forum: General Forum
03-02-2016, 22:06
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Replies: 19
Views: 3,426
Re: T-Boning a Rhino Track Drive
What is just as interesting as the rhino performance is the KOP performance with the pneumatic wheels.
It seems to be browning out when stalled. The 12 second, 42 second, and the last two pushing...
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Forum: General Forum
06-01-2016, 12:18
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Replies: 60
Views: 12,224
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Forum: Technical Discussion
13-12-2015, 23:00
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Replies: 9
Views: 1,848
Re: Drive Wheel Sizes
Smaller wheels also put a smaller moment on the axles when the wheels scrub during a turn. Less force on the axles is usually a good thing.
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Forum: General Forum
11-12-2015, 21:44
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Replies: 59
Views: 8,278
Re: FRC pocketing
Just to add to this:
The thickness of a plate has a cubic relationship to its rigidity. A "pocketed" plate of thicker material can have significantly more rigidity for the same weight as a thinner...
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Forum: Technical Discussion
09-12-2015, 15:08
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Replies: 39
Views: 6,497
Re: Intake wheel motors
You are correct. I forgot that we did have to sort through our CIM motors to find suitable keyseat flavors.
There were two reasons we didn't want to cut the shaft down.
1. To use the CIM motors for...
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Forum: Technical Discussion
09-12-2015, 12:41
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Replies: 39
Views: 6,497
Re: Intake wheel motors
You can run the versa planetary without modifying the CIM output shaft. I talked with Aren at vexpro, and the original intent for the CIM adapter was to leave the shaft unmodified. I do not...
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Forum: Technical Discussion
03-12-2015, 07:15
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Replies: 9
Views: 2,014
Re: Wheel Spacing Ratios
Nicely worded, yes you are correct.
I have edited the post with reference lengths and axis labels.
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Forum: Technical Discussion
02-12-2015, 23:27
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Replies: 9
Views: 2,014
Re: Wheel Spacing Ratios
Agreed, its really CoG dependent. This is more of a worst case scenario of centered weight on 4 of the 6 wheels.
The middle row is a square configuration for wheel contact of the outermost wheels...
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Forum: Technical Discussion
02-12-2015, 17:45
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Replies: 9
Views: 2,014
Wheel Spacing Ratios
I have seen a couple of these discussions pop up lately:
http://www.chiefdelphi.com/forums/showthread.php?t=139936
http://www.chiefdelphi.com/forums/showthread.php?t=139171
Past...
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Forum: Regional Competitions
01-12-2015, 18:52
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Replies: 59
Views: 12,050
Re: Strongest Regionals/District 2016?
Waterford is definitely FiM's strongest district this year. Per Karthik's metric:
1/34 einstein appearance, 12/34 champ elims, 11/34 MSC elims.
With open spots in Ann Arbor, it will be interesting...
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Forum: Technical Discussion
19-11-2015, 09:45
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Replies: 18
Views: 2,330
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Forum: Technical Discussion
18-11-2015, 15:52
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Replies: 18
Views: 2,330
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Forum: Technical Discussion
18-11-2015, 07:35
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Replies: 18
Views: 2,330
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Forum: General Forum
14-08-2015, 19:15
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Replies: 31
Views: 7,727
Re: Value in Failure vs. Value in Success
I would reword this a little bit, its more of a process. Instead of taking appropriate risks, engineering is about identifying risks and mitigating them. Once the criteria are defined, such as a...
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Don't put any weight into the OPR. It's ugly and its momma dresses it funny. - wilsonmw04 [more] 
