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Search took 0.03 seconds; generated 75 minute(s) ago. search: Posts Made By: Jared Russell
Forum: Technical Discussion 02-05-2016, 03:25 PM
Replies: 32
Views: 5,386
Posted By Jared Russell
Re: Playing well with others while scaling the tower

Two words:

unique RUNG

as in:
Forum: Scouting 02-03-2016, 05:01 PM
Replies: 19
Views: 2,503
Posted By Jared Russell
Re: Opinions of Q&A

Given that there are 9 unique types of defenses a robot may need to traverse this year - and depending on the event, a robot may have between 8 and 12 qual matches - it is likely that you won't...
Forum: Technical Discussion 02-02-2016, 02:28 PM
Replies: 32
Views: 5,386
Posted By Jared Russell
Re: Playing well with others while scaling the tower

How often did 3 robots on an alliance all hang in 2010?

That was a much simpler game (fewer things to do/less tradeoffs to make) and hanging/suspending was the single most valuable robot action,...
Forum: Rules/Strategy 02-02-2016, 01:00 PM
Replies: 51
Views: 8,073
Posted By Jared Russell
Re: How many balls will you shoot during autonomous?

Look at how many teams consistently did a "shoot - get discs from midline - shoot" auto in 2013. Maybe 20 in the world?

Look at how many teams consistently did a 2 zone auto (including bump...
Forum: General Forum 02-01-2016, 12:06 PM
Replies: 77
Poll: Low Bar
Views: 12,570
Posted By Jared Russell
Re: Low Bar

Moreover, a robot that has been designed to fit under the low bar as a rigid swept volume may find that things work a bit differently at 10+ feet per second...and especially with bouncy wheels...
Forum: General Forum 01-27-2016, 04:12 AM
Replies: 143
Views: 14,389
Posted By Jared Russell
Re: Opinion Poll: Proliferation of Prefbricated Parts

There have only been two years I can think of where a COTS mechanism could have given teams a spectacular advantage: minibots in 2011, and can grabbers in 2015.

Every other season, it takes more...
Forum: Extra Discussion 01-27-2016, 01:30 AM
Replies: 15
Views: 1,940
Posted By Jared Russell
Re: pic: Inconsistency in Boulder surface

All of our balls have patches like this of varying size (from almost unnoticeable to as large as in this photo).
Forum: General Forum 01-24-2016, 02:06 PM
Replies: 21
Views: 6,603
Posted By Jared Russell
Re: The Portcullis Mystery

Literally every question in this thread is answered in the field drawings (https://firstfrc.blob.core.windows.net/frc2016manuals/2016FieldComponents.pdf). Yes, it is a huge document, and yes, it...
Forum: General Forum 01-22-2016, 08:33 PM
Replies: 34
Views: 6,600
Posted By Jared Russell
Re: WCP MCC Robot 2016 powered by VEXpro!

Absolutely. This is a great example and resource for the community, but there certainly exists a "Minimum-er Competitive Concept".

The true minimal set of capabilities is something like:

Be able...
Forum: General Forum 01-22-2016, 03:53 PM
Replies: 10
Views: 1,829
Posted By Jared Russell
Re: Does the Rock Wall issue affect your robot design?

I am really curious to hear from people who answered "We are screwed" by this 0.75" change to one of the 9 unique defenses in this years' game.
Forum: Motors 01-22-2016, 02:56 PM
Replies: 27
Views: 3,264
Posted By Jared Russell
Re: How many CIMs in your drivetrain?

Yes, by putting two CIMs together in a gearbox you are basically creating a "super motor" with the same free speed but double the stall torque, stall current, and free current.

Obviously with larger...
Forum: Motors 01-22-2016, 12:59 AM
Replies: 27
Views: 3,264
Posted By Jared Russell
Re: How many CIMs in your drivetrain?

Maximum power and maximum efficiency occur at two separate points on the motor curve for brushed DC motors.

Maximum power occurs when P(out)=radial velocity * torque is maximized, which is at half...
Forum: Programming 01-21-2016, 04:18 PM
Replies: 9
Views: 1,820
Posted By Jared Russell
Re: GRIP on an NVIDIA Jetson TK1

It's tricky because the CPU and GPU do not/fundamentally cannot share address spaces. You need to explicitly upload your images to the GPU and download the results, which carries some performance...
Forum: General Forum 01-20-2016, 06:28 PM
Replies: 35
Views: 7,468
Posted By Jared Russell
Re: 2016 Boulder weight issue

How do they compare in terms of surface texture, firmness, and size?
Forum: General Forum 01-16-2016, 03:43 AM
Replies: 12
Views: 2,528
Posted By Jared Russell
Re: Did FIRST mess up the game element drawings?

This has varied considerably from year to year.
Forum: General Forum 01-16-2016, 03:42 AM
Replies: 14
Views: 1,739
Posted By Jared Russell
Re: 2016 Webcast Camera Angles

Full field view from the "50 yard line" may make it difficult to see what is going on in the outer works (ex. a portcullis or drawbridge in the nearest slot will block line of sight to the others). ...
Forum: General Forum 01-12-2016, 05:27 PM
Replies: 22
Views: 4,199
Posted By Jared Russell
Re: Drawbridge Door Contact Question

I think the referees have more than enough to keep track of this year as it is. Expecting them to reliably see ~100 millisecond long gaps in contact with a door is asking too much.
Forum: Technical Discussion 01-11-2016, 04:55 PM
Replies: 8
Views: 1,163
Posted By Jared Russell
Re: Mismatched wheels

This only works as long as the difference in diameters of the driven wheels is very small. I've seen plenty of cases where a team achieved a 1/8"-3/16" center drop by having all axles in line and...
Forum: Python 01-08-2016, 09:13 PM
Replies: 2
Views: 543
Posted By Jared Russell
Re: WIP release of integrated dynamics, a robot modelling library.

Cool! I definitely did not expect to stumble upon iLQG on Chief Delphi :)
Forum: General Forum 01-08-2016, 08:01 PM
Replies: 17
Views: 3,653
Posted By Jared Russell
Re: WCP 2016 Product Release + MCC

ADXRS453
Forum: General Forum 01-08-2016, 07:57 PM
Replies: 17
Views: 3,653
Posted By Jared Russell
Re: WCP 2016 Product Release + MCC

In 14 hours you will know the answer :)
Forum: Programming 12-22-2015, 02:08 PM
Replies: 9
Views: 1,581
Posted By Jared Russell
Re: Motion Planning and sensor integration

Yeah, that's the basic approach.
Forum: Programming 12-22-2015, 12:30 PM
Replies: 9
Views: 1,581
Posted By Jared Russell
Re: Motion Planning and sensor integration

In practice, a decent gyro will provide a quicker and more accurate estimate of yaw rate and heading for a differentially steered robot than using wheel encoders. Wheel slip is unavoidable, hard to...
Forum: Electrical 12-21-2015, 05:09 PM
Replies: 44
Views: 6,712
Posted By Jared Russell
Re: REV Sparks or Vex Victor 888?

I wouldn't dismiss CAN outright in 2016. Many of the horror stories happened years ago, when the *rio CAN software stack was less mature, CAN speed controllers were less mature, termination...
Forum: Technical Discussion 12-21-2015, 04:55 PM
Replies: 14
Views: 2,036
Posted By Jared Russell
Re: Belt-in-tube drive base

HTD and GT2 belts won't stretch by a noticeable amount. Once you have the right C-C spacing, you should never need to touch it again. That said, a tensioning method may make assembly and achieving...
Showing results 126 to 150 of 500
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