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-   -   pic: Begin Week 3 Prototype (http://www.chiefdelphi.com/forums/showthread.php?t=133167)

Omena Mushale 19-01-2015 16:27

pic: Begin Week 3 Prototype
 

SenorZ 19-01-2015 16:28

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.

Ether 19-01-2015 16:33

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Omena Mushale (Post 1430613)
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.

What's the slide wheel radius, and what's the total speed reduction from motor to wheel for the slide wheel?



Omena Mushale 19-01-2015 17:45

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Ether (Post 1430622)
What's the slide wheel radius, and what's the total speed reduction from motor to wheel for the slide wheel?



We just switched from slide to Mechanum, considering that speed isn't a big priority.

Omena Mushale 19-01-2015 17:46

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by SenorZ (Post 1430616)
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.

Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.

who716 20-01-2015 00:11

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Omena Mushale (Post 1430678)
Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.

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

IronicDeadBird 20-01-2015 00:17

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by who716 (Post 1430846)
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

I'll see your "faster then your opponents" and challenge with
"What greater opponent is there then time in this years game?"

DaveL 20-01-2015 00:29

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Omena Mushale (Post 1430678)
Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.

How did the 4 wheel Omni with the frame in the long orientation handle?

Brandon_L 20-01-2015 05:04

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.

pfreivald 20-01-2015 08:28

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Brandon_L (Post 1430877)
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.

We ran 6" mecanum on 9:1 reduction for years and were quite happy with it. Is that "lower than normal"?

Tom Line 20-01-2015 09:29

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Omena Mushale (Post 1430678)
Yeah, that's why we switched from slide to Mecanum becuse speed isn't big this year.

The forward speed of mecanum will be just as fast (or VERY close to as fast) as a normal tank drive. The OD of the wheel is not any smaller.

Dief Chelphi 20-01-2015 10:56

Re: pic: Begin Week 3 Prototype
 
Very cool. Good job.

Omena Mushale 20-01-2015 17:38

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.

wajirock 20-01-2015 17:54

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by who716 (Post 1430846)
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

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.

Abhishek R 20-01-2015 17:59

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by wajirock (Post 1431178)
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.

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).

wajirock 20-01-2015 18:05

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by Abhishek R (Post 1431179)
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).

I actually meant both.

dellagd 21-01-2015 00:20

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by who716 (Post 1430846)
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

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.

Quote:

Originally Posted by IronicDeadBird (Post 1430848)
"What greater opponent is there then time in this years game?"

254?

Ginger Power 21-01-2015 01:03

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by dellagd (Post 1431368)
254?

Yes, 254.

pfreivald 21-01-2015 07:30

Re: pic: Begin Week 3 Prototype
 
Quote:

Originally Posted by dellagd (Post 1431368)
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.

Exactly.


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