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Unread 24-01-2014, 18:32
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WaterClaw WaterClaw is offline
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AKA: Andrew A. Matthews
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Re: Team 314 Launcher

Quote:
Originally Posted by Bob Steele View Post
I am curious as to your definitions of accuracy and precision.
I would also ask which axis you are determining to be the x axis?

I found this prototype to be quite accurate. In the initial shots it was not scoring... but as it moved in it was hitting nearly every time into the goal. After moving in the first time it showed that they had found something that was remarkable. The "sweet spot" was quite big. In this, I mean that the shooter could be several different distances from the goal, and still score.

The purpose of the shooter is to score a goal. If it does that it is accomplishing the task. One can define this as accuracy. The goals have a quite large margin for error side to side. (Is this the x axis as you defined?)

I found the shots to be quite precise by the standard definition ... given that they were moving up the apparatus by hand and often did not have it lined up quite the same. The ball was almost always in the same place in the goal and within 4-6 feet side to side.

Please understand that no one is ridiculing your statement. I honestly took it for sarcasm also when I first read your statement that the prototype was inaccurate. I thought that their prototype was amazingly accurate and the discovery of the large "sweet spot" was an eye opener for me.

Now my definition of accurate was being able to put the ball in the goal.
Evidently you must have a different definition. That is fine.

Thank you for your comments
Precision is repeat-ability. To consistently make the same result with minimal outlying results. True, it can consistently score so repeat-ability is down pat. But accuracy is honed to a singled point as standard and all shots fired are referenced to said point.

If you intend to honestly say that "the entire goal is the single point of fire" then I am truly concerned as to your professionalism as a team. If you want to settle for just the goal as a posed to where in the goal, that's your decision. Simply put however, you must recognize that other robots will we doing considerably more.

The x-axis is left right by the way. Basic Geometry so I'm sure you know this. Just clarifying that I know what I'm saying.

Based on the direction being fired the ball had a most apparent tendency to curve in the air. True, averaging out all of your shots fired would result in a single point, which may be dead in front of your robot. However the target direction and the acquired result differed far too greatly at a distance. Even up close the x axis varies. You can never know how the game will play out and what will matter in the heat of the moment, and a short falling like that can and would be exploited.
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