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Unread 03-01-2010, 13:31
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Re: [FTC]: Rev 6 of Game Manual Changes Rules on Plastic and Aluminum Sheets

Following are my as yet unanswered (and therefore not visible) posts to the FTC Forum:

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On the basis of the answers to questions #3, #11, & #22:

#3 answered on 9/22/09
A: the total area of each type of material must be less than or equal to 576 sq. in. (i.e., 24" x 24") and the individual pieces must be able to be cut from a 24"x24" piece of raw material.

#11 answered on 9/29/09
A: Yes, as long an the total area and max. dimensions don't violate the limits

#22 answered on 10/8/09
A: Teams may use aluminum sheet with the following restrictions:
- Total combined area of all aluminum sheet is 24” x 24” in area (576 sq. inches) or less.
- No piece of aluminum may exceed 24 inches in length.
- Sheet thickness shall be 0.0625” or less.
- All of the pieces of aluminum sheet used in robot construction do not have to be cut out of the same 24” x 24” sheet of aluminum as long as the total area and maximum length rules are not violated.

over the past 2 months the students designed a ball lifting mechanism utilizing a PETG plastic cylinder 8" in diameter and 16" in height. The cylinder is constructed from two pieces of PETG 12.5" x 16". Total area is 400 square inches and all dimensions are less than 24". However, the two pieces had to be cut from two different 24x24 in sheets. This was not a problem based upon the above answers. Now, in R6 of the Game Manual just recently posted the words "Not more than 1" were added to the rules pertaining to the plastic and aluminum sheets. It seems unfair to make this rule change at this late date after competitions have already been held. This is not a clarification, but a major change which contradicts not just one but three official forum answers that have been posted for more than two months. Please advise what I should tell the students about their completely fabricated and working design

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Rev 6 rule changes to <R5> c.1, c.2, c.3, c.4, and c.6 also directly contradict answer to post #9 in Other Parts and Materials

Quote:
Originally Posted by 2009FTC3658
Q: Is it possible to use more than one thickness of a particular material as long as the total area for that material does not exceed 576 sq. in. or the extent constraint? For example, use a 12" x 24" x 0.0625 sheet of Polycarbonite and a 12 x 24 x 0.093 sheet of Polycarbonite. This would constitute a total for Polycarbonite of 24" x 24" that is within the thickness limit.
A: Yes.
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