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By: Omena Mushale
New: 19-01-2015 13:44
Updated: 19-01-2015 17:45
Views: 2585 times
This is the state of our prototype as we begin week 3 of the 2015 build season. The current estimated speed is 14 ft/s. We are staying with the use of omni wheels and we are in the process of programming slide drive.
UPDATE: We switched from slide drive to Mecanum.
Discussion
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19-01-2015 16:28
SenorZ
Re: pic: Begin Week 3 Prototype
14fps seems mighty fast.
In a game with such limited real estate, accelerating up to and down from that speed might be difficult. You might consider, after testing, switching gear ratios and go for torque over speed.
19-01-2015 16:33
Ether
Re: pic: Begin Week 3 Prototype
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Originally Posted by Omena Mushale
The current estimated speed is 14 ft/s. We are staying with the use of omni wheels and we are in the process of programming slide drive.
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19-01-2015 17:45
Omena Mushale
Re: pic: Begin Week 3 Prototype
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Originally Posted by Ether
What's the slide wheel radius, and what's the total speed reduction from motor to wheel for the slide wheel?
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19-01-2015 17:46
Omena Mushale
Re: pic: Begin Week 3 Prototype
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Originally Posted by SenorZ
14fps seems mighty fast.
In a game with such limited real estate, accelerating up to and down from that speed might be difficult. You might consider, after testing, switching gear ratios and go for torque over speed. |
20-01-2015 00:11
who716
Re: pic: Begin Week 3 Prototype
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Originally Posted by Omena Mushale
Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.
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20-01-2015 00:17
IronicDeadBird
Re: pic: Begin Week 3 Prototype
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Originally Posted by who716
well im going to have to disagree with you on that speed is everything this year with the new format for playoffs and ranking you have to be faster then your opponents
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"What greater opponent is there then time in this years game?"
20-01-2015 00:29
DaveL
Re: pic: Begin Week 3 Prototype
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Originally Posted by Omena Mushale
Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.
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20-01-2015 05:04
Brandon_L
Re: pic: Begin Week 3 Prototype
I've never used mecs so correct me if I'm wrong but I believe mec drives are generally geared to a lower them "normal" speed because of the amount of force needed to strafe.
I asked in your last picture as well what the estimated speed was because it seemed really high. Think about it this way, in 2013 teams that were successful single speed cyclers were geared in the 13 or 14 fps area. They were loading at the human player station then bolting across the field to the pyramid which automatically lined them up for their shot in a rather wide goal. Not a terrible amount of accurate needed seeing as you could auto aim your robot by hitting the pyramid. In this game at any given time you have half that distance to travel, and you don't need to fly across the field for any reason. For 2015, I'd say accuracy in lining up crates/stacks > raw speed.
Tl;dr a high drive speed doesn't necessarily mean you're going to stack crates faster. And I'm pretty sure you need a bigger ratio for mecs but I could be wrong.
On another note, the business end of the robot is looking good.
20-01-2015 08:28
pfreivald
Re: pic: Begin Week 3 Prototype
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Originally Posted by Brandon_L
I've never used mecs so correct me if I'm wrong but I believe mec drives are generally geared to a lower them "normal" speed because of the amount of force needed to strafe.
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20-01-2015 09:29
Tom Line
Re: pic: Begin Week 3 Prototype
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Originally Posted by Omena Mushale
Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.
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20-01-2015 17:38
Omena Mushale
Re: pic: Begin Week 3 Prototype
who716:
However, speed for manipulating and stacking totes is more important for the speed of the actual drive system this year. This year robots aren't gooing across the field to drop a game element somewhere.
20-01-2015 17:54
wajirock
Re: pic: Begin Week 3 Prototype
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Originally Posted by who716
well im going to have to disagree with you on that speed is everything this year with the new format for playoffs and ranking you have to be faster then your opponents
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20-01-2015 17:59
Abhishek R
Re: pic: Begin Week 3 Prototype
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Originally Posted by wajirock
Efficiency seems more important than being fast. It doesn't matter if you can cross the field and create a stack of 6 in 2 seconds if it only works 50% of the time. Being able to do one task as efficiently as possible is the key to winning.
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20-01-2015 18:05
wajirock
Re: pic: Begin Week 3 Prototype
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Originally Posted by Abhishek R
Maybe you meant consistency when you were talking about being able to do it 50% of the time...but yeah, I agree, efficiency is also very important (which could possibly be achieved by drivetrain speed, just one aspect however).
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21-01-2015 00:20
dellagd
Re: pic: Begin Week 3 Prototype
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Originally Posted by who716
well im going to have to disagree with you on that speed is everything this year with the new format for playoffs and ranking you have to be faster then your opponents
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Originally Posted by IronicDeadBird
"What greater opponent is there then time in this years game?"
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21-01-2015 01:03
Ginger Power
Re: pic: Begin Week 3 Prototype
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Originally Posted by dellagd
254?
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21-01-2015 07:30
pfreivald
Re: pic: Begin Week 3 Prototype
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Originally Posted by dellagd
Just would like to point out that, while all that really matters is your 'speed' of scoring, that doesn't necessarily mean the 'linear speed' of your drive train.
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