FRC Bowling Ball Competition Questions

FRC Bowling Ball Competition Questions

Q: According to the specifications for the bowling ball competition, a core-filled ball is allowed. But I have a hard time fully understanding the meaning of "core-filled." Does it mean a solid sphere or a hollow sphere? Or can it also be a hollow sphere with additional solid sphere inside of it as the "core-filled" part of the ball?

A: Core-filled means that the center (core) of the bowling ball may be filled with a non-concrete substance. See rules about Non-FRC materials.

Q: When the balls are tested, should the balls be at their 28th day?

A: There is no rule regarding this.

Q: Since there is no requirement about the concrete age in the Rules, can we cast the concrete as early as possible to gain a bigger strength?

A: No comment, meaning that is not the rule makers' decision and again there is no rule regarding this.

Please clarify the above.

The clarification is that the normal interpretation of contest rules is that unless something is said, there is no rule or constraint on what is done. Another way to say this is permission is given to do whatever unless the rules say what to do or what not to do.

Q: Is the bowling ramp fixed? Could the team bowler modify the direction or the position of the ramp?

A: Repositioning of the ramp has not been decided by the judges (see … regarding the judges' authority to change/modify/interpret the rules)

Q: What is the format and size of the testing apparatus' plates?

A: Hardened steel plates 6.5 in. (165 mm) in diameter (this is a different machine from the previous contests and see … regarding the judges' authority to change format and size)

Q: Our team noticed that the "earliest pour" date has been removed from the rules. Can you confirm that the FRC Bowling Balls can cure for an unlimited amount of time?

A. The normal interpretation of contest rules is that unless something is said, there is no rule or constraint on what is done. Another way to say this, permission is given to do whatever unless the rules say what to do or what not to do.

As a result of all this, we make no comment on the specific question other than the underline above.

Q: The bowling balls shall be spherical (no finger holes) and measure 200 mm ± 15 mm diameter. Do you mean no hole on the ball? or free hole size and diameter?

A: A normal bowling ball has three finger holes for the bowler to handle and control the bowling ball throw and resulting roll down the alley. The bowling balls for this competition have no need and will NOT use finger holes to handle, control, or throw the bowling balls. The bowling balls for this competition will roll down a ramp.

Q: We cannot find in competition rules information about:
1. Water to cement ratio for concrete mix.
2. Water to binder ratio for concrete mix.
3. How much of the mass of cement can be replaced by non-Portland cement materials (e. g. SCMs (e.g silica fume, fly ash), ASCMs, natural pozzolans and mineral fillers).
4. Sizes of core and distributed (shell) for ball.
5. Kind of aggregate, limits for every aggregate types (for example can we use only fine aggregate in our mixture?)

Does it mean there is no requirement for above information / conditions?

A: The clarification is that the normal interpretation of contest rules is that unless something is said, there is no rule or constraint on what is done. Another way to say this is permission is given to do whatever unless the rules say what to do or what not to do.

When available, ask questions using line numbers for reference to help answer the questions. Only if no line numbers are available, then ask questions with a limited screen capture for reference to help answer the questions.

Q: Due to competition rules: If the applied load exceeds 70,000 pounds during any portion of this test, toughness test score will be zero”. In toughness test result equal to 0 is the highest or the lowest score?

A: Zero is the lowest score possible.

Q: Is it is permitted to add one more line to include other liquid admixture similar to the Excel format of 2017 or the contest restricts to use just one liquid admixture?

A: The clarification is that the normal interpretation of contest rules is that unless something is said, there is no rule or constraint on what is done. Another way to say this is permission is given to do whatever unless the rules say what to do or what not to do.

Q: For the mass test, am I thinking correctly that we will predict the mass for the ball and the accuracy of this prediction is what we will be scored on? (Is this the same for the diameter test?)

For the Load test, am I correct in thinking that we will guess the load necessary for the specified deflections and the accuracy of these guesses will determine our score.

For the toughness test, our score will be determined by our load for different deformations?

A: The winning team has the least difference between predictions and results. Please see below:

Specifications Test (10%)
Follow the directions for the schedule and the paperwork for the registration, submittal, and convention.

Mass Test (10%)
Produce a consistent mass for each bowling ball.

Diameter Test (10%)
Produce a consistent spherical shape for each bowling ball.

Bowling Test (30%)
Score the highest in six-pin bowling rolled during the convention.

Toughness Test (20%)
Provide the highest average load for multiple deformations.

Load Test (20%)
Accurately predict the load at the maximum deformation.

An example design submittal can be found here .

Q: We found a glass fiber called SE1200, manufactured by OWENS CORNING. The Product Information Datasheet does not mention explicitly that is manufactured in compliance with the ASTM C1666, it is only mentioned that the mechanical properties were determined according to ASTM D2343 and D2344 so is for that reason that we wanted to ask if this material would be allowed for its use in the competition.

A: The words fiber materials as described is not the same as and does not mean manufactured in compliance with.

The clarification is that the normal interpretation of contest rules is that unless something is said, there is no rule or constraint on what is done. Another way to say this is permission is given to do whatever unless the rules say what to do or what not to do.

When available, ask questions using line numbers for reference to help answer the questions. Only if no line numbers are available, then ask questions with a limited screen capture for reference to help answer the questions.

Q:
1.) In the rules says that we can only use 2 of the 4 fiber materials that are specified on it (steel, glass, synthetic and natural), but our doubt it, can we use more than 2 different types of fiber as long as those are made of only 2 different fiber materials? For example, can we use a combination of 1 glass fiber and 2 synthetic fibers, or we can only use a combination of 2 different type of fibers, like 1 glass fiber and 1 synthetic?

2.) In the rules mentioned a page of fiber's suppliers, can we only use fibers of those suppliers or can we use fibers from another suppliers that are not mentioned in that page?

A:
1.) The fiber-reinforced concrete mixture design shall include only 4 fiber materials as described by their respective ASTM specification as listed in the Design Submittal. Do not use any other fiber materials. Use 1, but no more than 2, of the 4 fiber materials listed

2.) Fiber suppliers from the ACI 544 Fiber Reinforced Concrete committee are listed for possibly supplying fibers. Fiber suppliers are also listed in the website for the Fiber Reinforced Concrete Association. http://fiberreinforcedconcrete.org

The clarification is that the normal interpretation of contest rules is that unless something is said, there is no rule or constraint on what is done. Another way to say this is permission is given to do whatever unless the rules say what to do or what not to do.

When available, ask questions using line numbers for reference to help answer the questions. Only if no line numbers are available, then ask questions with a limited screen capture for reference to help answer the questions.

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