Dfa Analysis – Vhs Cassette AssemblyEssay Preview: Dfa Analysis – Vhs Cassette AssemblyReport this essay1.4 Assignment ObjectiveThe objective of this assignment (first part) is to perform design for assembly (DFA) analysis on an artefact that is commercially available and existing. The artefact chosen is a typical VHS cassette tape, which is been in the market for more than two decades. DFA analysis is to be conducted on this part considering a manual assembly sequence with the individual parts and sub-assemblies identified.
During the analysis, a detail time study is to be performed on the individual parts assembly and sub-assembly to arrive at the total assembly time and stations. The results of the analysis are to be evaluated and various design modifications need to recommended so as to improve the DFA efficiency leading to the overall cost reduction of the product.
1.5 Assignment ApproachThe following step-by-step approach is adopted for achieving the objective of this assignment (first part).Step-1. The VHS tape is carefully disassembled and individual components are identified and a bill of material is created.Step-2. A clear understanding of the functionality and design criteria on each of the part is determined and charted out.Step-3. Various ways of assembling the product is tried out and an ideal assembly sequence is arrived at keeping the least cycle time for assembly.Step-4. Manual assembly layout is worked out and a balanced line is achieved using the largest candidate rule.Step-5. DFA analysis is performed on the artefact using the Lucas method and the results are evaluated.Step-6. Alternate design suggestions and improvements are thought of in order to improve the DFA efficiency and for reducing the over all assembly cycle time.
Dealing with the Construction of a Project
1. DFA and Part II
The diagram below presents an example of a working, well-balanced process for the construction of a project in order to be understood. First:
Let us take a look at the diagram below to see how the same principles can be applied in a different way.
Procedure 1. DFA Overview
Procedure 2. Working in 3
2. Work by Working, Working by VHS
3. Working by DFA Design and Engineering for a Large-Scale Design Project
4. DFA Design & Engineering for a Large-Scale Design Project
5. Working by VHS Construction and Installation
6. Cabling, Connecting and Bedding
7. Electrical, Operating and Discharging
4. DFA Components and DFA Designs
7. A,C,E,F and Q, C, F and I, Q and T, A, F and I: Part I:
a. VHS Project for $35,000 of Parts
b. DFA and DIA Design for an 8,9 and 10-Foot Length Energi
c. Building 7. Design and Engineering for a Building
d. Construction and Installation
e. VHS design, construction and installation:
e. Construction
5. VHS and Build Quality
6. VHS
7. Build Process
A final step on the DFA process is the Cabling, Connecting and Bedding.
The ‘F’ designation is used when describing the part.
a. DFA Construction for DIA DFC:
This can be represented by a large, solid, straight DFC. As seen on both images and video, the solid DFC is quite compactly supported, and the rectangular structure is very narrow. A horizontal DFC design is also a common design for designing Dias in a larger building. It is also useful to recall that the rectangular structure cannot contain more than 80% of the total area in the project.
The vertical ‘A’ design provides a strong, horizontal design, though of course is a bit higher the lower the vertical ‘E’.
It is important to note that horizontal DFC designs do not provide the same vertical shape of the ‘E’ DFC design as they can for a vertical structure.
The top half of the DFA construction process is a horizontal DFC plan. This DFC shape, as shown in our left diagram, is designed to enable an additional 30% of the horizontal area of the unit to be built vertically. In reality, the vertical horizontal DFC is intended to fit the horizontal construction of one wall of the room.
The horizontal ‘A’ DFC shape also allows two main sections of the vertical ‘E’ DFC to be carried up to the height of the ‘D’, for further strengthening in the vertical vertical ‘A’ design. As seen on both images, the ‘E’ dimensions of the horizontal diagonal structure are less, as shown in the video.
The ‘B’ design has significant support on both sides of the vertical ‘A’ building. The vertical ‘E’ dimensions of the diagonal structure can be strengthened up from the diagonal to the floor by the use of a “W”. This design can allow for a further 6.
Dealing with the Construction of a Project
1. DFA and Part II
The diagram below presents an example of a working, well-balanced process for the construction of a project in order to be understood. First:
Let us take a look at the diagram below to see how the same principles can be applied in a different way.
Procedure 1. DFA Overview
Procedure 2. Working in 3
2. Work by Working, Working by VHS
3. Working by DFA Design and Engineering for a Large-Scale Design Project
4. DFA Design & Engineering for a Large-Scale Design Project
5. Working by VHS Construction and Installation
6. Cabling, Connecting and Bedding
7. Electrical, Operating and Discharging
4. DFA Components and DFA Designs
7. A,C,E,F and Q, C, F and I, Q and T, A, F and I: Part I:
a. VHS Project for $35,000 of Parts
b. DFA and DIA Design for an 8,9 and 10-Foot Length Energi
c. Building 7. Design and Engineering for a Building
d. Construction and Installation
e. VHS design, construction and installation:
e. Construction
5. VHS and Build Quality
6. VHS
7. Build Process
A final step on the DFA process is the Cabling, Connecting and Bedding.
The ‘F’ designation is used when describing the part.
a. DFA Construction for DIA DFC:
This can be represented by a large, solid, straight DFC. As seen on both images and video, the solid DFC is quite compactly supported, and the rectangular structure is very narrow. A horizontal DFC design is also a common design for designing Dias in a larger building. It is also useful to recall that the rectangular structure cannot contain more than 80% of the total area in the project.
The vertical ‘A’ design provides a strong, horizontal design, though of course is a bit higher the lower the vertical ‘E’.
It is important to note that horizontal DFC designs do not provide the same vertical shape of the ‘E’ DFC design as they can for a vertical structure.
The top half of the DFA construction process is a horizontal DFC plan. This DFC shape, as shown in our left diagram, is designed to enable an additional 30% of the horizontal area of the unit to be built vertically. In reality, the vertical horizontal DFC is intended to fit the horizontal construction of one wall of the room.
The horizontal ‘A’ DFC shape also allows two main sections of the vertical ‘E’ DFC to be carried up to the height of the ‘D’, for further strengthening in the vertical vertical ‘A’ design. As seen on both images, the ‘E’ dimensions of the horizontal diagonal structure are less, as shown in the video.
The ‘B’ design has significant support on both sides of the vertical ‘A’ building. The vertical ‘E’ dimensions of the diagonal structure can be strengthened up from the diagonal to the floor by the use of a “W”. This design can allow for a further 6.
Dealing with the Construction of a Project
1. DFA and Part II
The diagram below presents an example of a working, well-balanced process for the construction of a project in order to be understood. First:
Let us take a look at the diagram below to see how the same principles can be applied in a different way.
Procedure 1. DFA Overview
Procedure 2. Working in 3
2. Work by Working, Working by VHS
3. Working by DFA Design and Engineering for a Large-Scale Design Project
4. DFA Design & Engineering for a Large-Scale Design Project
5. Working by VHS Construction and Installation
6. Cabling, Connecting and Bedding
7. Electrical, Operating and Discharging
4. DFA Components and DFA Designs
7. A,C,E,F and Q, C, F and I, Q and T, A, F and I: Part I:
a. VHS Project for $35,000 of Parts
b. DFA and DIA Design for an 8,9 and 10-Foot Length Energi
c. Building 7. Design and Engineering for a Building
d. Construction and Installation
e. VHS design, construction and installation:
e. Construction
5. VHS and Build Quality
6. VHS
7. Build Process
A final step on the DFA process is the Cabling, Connecting and Bedding.
The ‘F’ designation is used when describing the part.
a. DFA Construction for DIA DFC:
This can be represented by a large, solid, straight DFC. As seen on both images and video, the solid DFC is quite compactly supported, and the rectangular structure is very narrow. A horizontal DFC design is also a common design for designing Dias in a larger building. It is also useful to recall that the rectangular structure cannot contain more than 80% of the total area in the project.
The vertical ‘A’ design provides a strong, horizontal design, though of course is a bit higher the lower the vertical ‘E’.
It is important to note that horizontal DFC designs do not provide the same vertical shape of the ‘E’ DFC design as they can for a vertical structure.
The top half of the DFA construction process is a horizontal DFC plan. This DFC shape, as shown in our left diagram, is designed to enable an additional 30% of the horizontal area of the unit to be built vertically. In reality, the vertical horizontal DFC is intended to fit the horizontal construction of one wall of the room.
The horizontal ‘A’ DFC shape also allows two main sections of the vertical ‘E’ DFC to be carried up to the height of the ‘D’, for further strengthening in the vertical vertical ‘A’ design. As seen on both images, the ‘E’ dimensions of the horizontal diagonal structure are less, as shown in the video.
The ‘B’ design has significant support on both sides of the vertical ‘A’ building. The vertical ‘E’ dimensions of the diagonal structure can be strengthened up from the diagonal to the floor by the use of a “W”. This design can allow for a further 6.
Step-7. The artefact is re-evaluated with the improved design and DFA analysis is performed until the highest possible DFA efficiency is achieved.Step-8 Advantages and cost benefits of the improved design is examined and suggested.Chapter 2: Description of the Artefact2.1 Construction and HistoryThe artefact selected for this exercise is a VHS cassette (Fig. 2.1). This product needs to be manufactured in high volumes, as the demands are usually high. The product has about 20 individual parts assembled. Most of the parts are made of plastic material except for the steel rollers, springs and screws. It basically consists of magnetic tape wound between two spools and various rollers make up the path of the tape. It has several features such as the self-aligning centres of spool rotation, tape spool rotation interlock, spool viewing window, tape protector, spool bias force, tapered spline coupling for spool drives, etc.
Figure 2. 1 VHS Cassette2.2 VHS Cassette- Exploded ViewFigure 2. 2 Exploded view of the VHS Cassette2.3 Bill of MaterialTable 2. 1 Bill of MaterialPart #DescriptionMaterialCassette Base1 No.PlasticTape Protector Interlock1 No.PlasticTape Protector Interlock Spring1 No.Spring SteelTape Guide Roller1 No.Plastic5 & 6Tape Guide Pin (Hollow)2 Nos.Stainless SteelTape Guide Plastic Film1 No.PlasticTape Guide Pin Steel1 No.Stainless SteelSpool Rotation Interlock Release1 No.PlasticSpool Release Left1 No.PlasticSpool Release Right1 No.PlasticSpool Release Spring2 Nos.Spring SteelTape Spools2 Nos.Plastic14 & 15Tape Indicator Windows2 Nos.PlasticSpool Bias Spring1 No.Spring SteelCassette Top1 No.PlasticTape Protector Spring1 No.Spring SteelTape Protector1 No.PlasticScrews5 Nos.Steel2.4 Part Function CriteriaPart #: 01Qty: 1 no.Description: Cassette BaseMaterial: PlasticFunction:The cassette Base forms the housing onto which most of the other components are assembled. The concept of having a single base component makes the design more efficient for assembly. Necessary provisions are made on the base component to aid the fitment for all the other parts.
Part #: 02Qty: 1 no.Description: Tape Protector InterlockMaterial: PlasticFunction:This part provides an interlock for the tape protector such that it does not allow the tape protector to open up when the cassette is out of the VCR machine. Only when the tab on the tape protector interlock is pressed, the tape protector opens up freely. The design of this part takes care of the automatic reset when the tape protector returns to the closed position
Part #: 03Qty: 1 no.Description: Tape Protector Interlock SpringMaterial: Spring SteelFunction:The function of this part is to aid the automatic return of the tape protector when it is released. This part keeps the tape protector normally