Goals:
1. Explore potential wheelchair donations from the Long Beach Veteran's Administration Hospital and other local hospitals
2. Determine approximate gear ratio, gear separation, and lever arm length based upon wheelchair dimensions
Goals Met:
1. A wheelchair was purchased for $15 dollars from a garage sale. This wheelchair is not as wide as the previous wheelchair used for dimensions. This does not affect previous research or design plans.
2. Lever arm length: 25 inches
Gear Ratio: 2:1 ratio, about 52:26 tooth ratio
Approximate Gear Separation: 9 inches
Approximate chain length: 38-39 inches
It was determined that bike industry standard chain and sprockets will be ideal for construction of the mechanism.
All values are approximate dimensions and are subject to change as seen fit by team members or design/manufacture restrictions.
Goals For May 4- May 10
1. Solidworks rendering of the mechanism with approximate lengths and geometry
2. Prepare presentation for concept design review
3. Prepare Concept Design Review Report
4. Research possible attachment methods for the mechanism
References:
Sprocket radius size by number of teeth
Tuesday, April 29, 2014
Wednesday, April 23, 2014
Weekly Update: April 20-April 27
Goals:
1. Analyzing the dimensions of the wheelchair.
2. Research chain and sprocket standard industry dimensions
3. Research lever arms and attachments for the mechanism
Goals Met:
1.
2. When researching chain and sprocket driven systems, it was found that a vertical drive system is not ideal as it requires additional maintenance due to wear and the resulting lack of tension. It is best if the system is slightly off vertical to reduce the amount of adjustment necessary later during usage. ANSI sprocket standards were found and a potential supplier of sprocket and chain systems (Martin Sprocket & Gears, Inc).
3. Attachments for the mechanism will need to be determined after wheelchair choice has been made to understand the ideal mechanism setup. Lever arms will need to be determined after wheelchair choice as well to determine if bent lever arms or straight lever arms will be ideal for operation and user comfort.
New Goals for April 27- May 3:
1. Explore potential wheelchair donations from the Long Beach Veteran's Administration Hospital and other local hospitals
2. Determine approximate gear ratio, gear separation, and lever arm length based upon wheelchair dimensions
References Used:
1. Sprocket and Chain Design Tips
2. Sprocket and Chain Nomenclature and Standards
1. Analyzing the dimensions of the wheelchair.
2. Research chain and sprocket standard industry dimensions
3. Research lever arms and attachments for the mechanism
Goals Met:
1.
3. Attachments for the mechanism will need to be determined after wheelchair choice has been made to understand the ideal mechanism setup. Lever arms will need to be determined after wheelchair choice as well to determine if bent lever arms or straight lever arms will be ideal for operation and user comfort.
New Goals for April 27- May 3:
1. Explore potential wheelchair donations from the Long Beach Veteran's Administration Hospital and other local hospitals
2. Determine approximate gear ratio, gear separation, and lever arm length based upon wheelchair dimensions
References Used:
1. Sprocket and Chain Design Tips
2. Sprocket and Chain Nomenclature and Standards
Wednesday, April 16, 2014
Weekly Update: April 13-April 19
Goals:
1.Research sprocket and chain driven systems versus meshed gear driven systems
2. Explore financial options for bank accounts for project funds
3.Analyze wheelchair dimensions and structure for preliminary design
Goals Met:
1. The goal of researching sprocket and chain systems versus meshed gear systems proved very useful research for our mechanism design. Using The CRC Handbook of Mechanical Engineering and the Marks' Standard Handbook for Mechanical Engineers, it was decided that a sprocket and chain driven mechanism will be more ideal for the project. This is because of the lighter weight of the sprocket and chain driven systems. Meshed gear systems can prove to be very heavy yet very durable. Meshed gears would be more useful for high input force systems, but due to the low input force of a wheelchair user, a sprocket and chain system was found to be suitable. It was also found that the internet would be a viable source for relevant information and should be utilized more effectively in future research.
2. Financial solutions for group funding directed towards opening a checking account at Wells Fargo bank to track project funds. Before buying any materials or parts, each member will allot equal amounts of money to the group fund and the checking account will be used for all purchases.
3. Analyzing the wheelchair dimension was not completed this week as transportation of the wheelchair was not viable. The group will also be looking into alternative routes to have a wheelchair donated for the project.
New Goals for 4/20/14-4/26/14:
1. Analyzing the dimensions of the wheelchair.
2. Research chain and sprocket standard industry dimensions
3. Research lever arms and attachments for the mechanism
1.Research sprocket and chain driven systems versus meshed gear driven systems
2. Explore financial options for bank accounts for project funds
3.Analyze wheelchair dimensions and structure for preliminary design
Goals Met:
1. The goal of researching sprocket and chain systems versus meshed gear systems proved very useful research for our mechanism design. Using The CRC Handbook of Mechanical Engineering and the Marks' Standard Handbook for Mechanical Engineers, it was decided that a sprocket and chain driven mechanism will be more ideal for the project. This is because of the lighter weight of the sprocket and chain driven systems. Meshed gear systems can prove to be very heavy yet very durable. Meshed gears would be more useful for high input force systems, but due to the low input force of a wheelchair user, a sprocket and chain system was found to be suitable. It was also found that the internet would be a viable source for relevant information and should be utilized more effectively in future research.
2. Financial solutions for group funding directed towards opening a checking account at Wells Fargo bank to track project funds. Before buying any materials or parts, each member will allot equal amounts of money to the group fund and the checking account will be used for all purchases.
3. Analyzing the wheelchair dimension was not completed this week as transportation of the wheelchair was not viable. The group will also be looking into alternative routes to have a wheelchair donated for the project.
New Goals for 4/20/14-4/26/14:
1. Analyzing the dimensions of the wheelchair.
2. Research chain and sprocket standard industry dimensions
3. Research lever arms and attachments for the mechanism
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