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TCC Engineering Specifications and Engineering Standards Summary PPT

Tulsa Community College

Question Description

I need support with this Engineering question so I can learn better.

I want to turn two pages paragraphs into three powerpoint slides.

I would like for each paragraph to be summarized into 2-3 main points or sentences in the powerpoint.

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Safety Considerations The main safety considerations are the tipping point of the frame and pinch points. The wheels on the bottom of the frame are potential pinch points. A solution that does not limit mobility is to include guards, welded or fixed to the frame to cover the wheels. An idea to prevent the machine from tipping while it is stationary is to mount the wheels onto triangular frames that can swing out and distribute the weight of the machine outward. The extendable legs can then be folded back in while the device is being transported so that it can fit through doorways. Design and testing of this concept will take place once the base frame is constructed. The tipping point of the final frame is determined using geometric and mass properties provided by Solidworks. Climbing on top of the frame is another risk for tipping. To prevent children or students from climbing on top of the machine, steel letters will be carved out on the burn table to spell out “Department of Mechanical Engineering''. The decorative sign on top of the machine will discourage people from climbing or hanging off the frame. The individual components of this machine containing interfacing gears or other pinch points must be covered to ensure user safety. The current design covers all interior pinch points of the machine with an acrylic casing. The durability of each individual step, the connection between steps, the frame, and the electronic components is important for the longevity of this project. In addition to ensuring that the machine holds up, the safety of the users is also vitally important. This design must be in compliance with engineering standards for a product being used by children and minors. Engineering Specifications and Engineering Standards Due to the nature of this project, the majority of testing will occur once the machine itself is completed. Preliminary testing has included the part materials and their compatibility with the rest of the machine to ensure that the Rube Goldberg setup works. Since this device is being built from the inside out, only rudimentary analyses have been completed for a few of the following specifications that apply to the completed project and are summarized in Table 1 below. All standards that apply thus far are listed in Appendix D. Toy Safety The most significant engineering standard for our project is the ASTM F963-17 Standard Consumer Safety Specification for Toy Safety. Within this standard comes our customers primary concern of tipping. ASTM F963-17 states that “Stationary floor toys of... greater than 10 lbs shall not tip when placed on a 10° incline” (section 4.15.4). Once the weight of the final device is known, we can apply this physical property to our current SolidWorks model and perform the necessary analysis on a 10˚ incline. The Standard Safety Specification for Clothing Storage Units (ASTM F2057-14) is also being referenced for our project. The potential to have children climb on the machine similar to how they may climb on dressers presents another concern for our design if they were to tip it over. Tests will be conducted once the final weight is determined and additional weight may be added if proven necessary. The letter display on top of the machine is a preventative design feature that will discourage any climbing that may lead to injury. Additionally, our project must comply with section 4.7.3 which states that “edges, including holes and slots, shall be free of hazardous burrs and feathering…”. To ensure the safety of all that interact with the device, our design must comply with this specification for metal parts, specifically our frame structure. Given that we also have interactive components to this machine that the user will be in contact with, the same specification applies to other fabricated parts including handles, gears, and other hands-on pieces that are not metal. No specific number was provided for the surface roughness of the parts, so once the parts have been manufactured, our team will seek professional opinion from a professor or lab instructor. The ASTM E2299-13 Standard Guide for Sensory Evaluation of Products by Children and Minors is another engineering standard that applies to the Rube Goldberg machine. The specification concerned with our project states that “it is the responsibility of the testing group to make sure no harm or injuries occur as a result of faulty products or test facilities”. In relation to our device, for any testing that occurs while children and minors are present, it is the senior team’s responsibility to ensure user safety with the machine itself as well as the surrounding areas. Once the inner workings of the project are functional and safely enclosed, it is our intention to showcase the preliminary machine to a small group of elementary-age children and gather thoughts, ideas, and potential areas to improve on. ADA Accessibility Given that our design is to be transported around Samson Plaza, it has to fit through entryways and doorways within the buildings. For a design constraint, we limited the size of our project to fit through a doorway (7’ tall x 32” wide) and into an elevator (51” x 61”) with dimensions specified by ADA Compliance 4.13.5 and ADA Standard 407, respectfully. Preliminary testing with a wooden frame mockup prototype showed our design is compatible with all the doors and elevators within the Samson Plaza buildings. As an educational tool, it is our intention to have students with disabilities interact with our machine as well. While no testing has been conducted for this specification, ADA Accessibility A4.12.2 states that a user “should require no more than 5 lbf (22.2 N) to move” any interactive cranks or gears. Testing will be completed as soon as the interactive components are functional and force inputs by the user can be adjusted to meet this standard. Stability and Visibility The device will be displayed primarily in Stephenson Hall where it will remain stationary unless being used for an event. To ensure the device does not roll while students are interacting with it, the castors we have must comply with the ANSI Institute of Castor and Wheel Manufacturers. Section 6.5.1.6 states that a “break must hold for 10 seconds with applied horizontal force” that is a fraction of the total device weight. Once the final weight of the prototype is determined, the breaks that we have can undergo testing in order to meet this specification. While not necessary, the final standard we want to meet for our project involves the radiometric and photometric properties of materials (DIN 5036-3). Our team was informed that museums use this standard which states that plastic barriers or encasings should have “greater than 90% light transmission”. The exact section this specification comes from is unknown, but we will use it to ensure that users have maximum visibility of our machine and are able to take photos of it. Manufacturing data for the plastic will tell us the light transmission of the material and whether or not it should be used as our final encasing. ...
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Summary

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Safety considerations

➢ Machines are dangerous and safety considerations should be taken to
keep students safe.
➢ The main safety considerations are the tipping point of the frame and
pinch points.
➢ The best way to prevent a machine from tipping is to mount its wheels
onto triangular frames.
➢ Apart from the machine wheels being unstable, climbing on the machine
can also cause tipping.
➢ To prevent children and students from climbi...

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