Group 3 - Homelite Fluid Pump (Gasoline Powered) - Work Proposal
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Work Proposal
Creating a well-developed plan is a crucial step to take in preparation for the dissection of a mechanically complex product like the Homelite fluid pump. This section is focused on laying the framework for such a plan by proposing a generalized approach to disassembly & assembly, specific challenges & requirements, and evaluating group members' strengths & weaknesses.
Disassembly & Assembly
The processes of disassembly and assembly will be addressed with the same order in which they will be encountered for this project.
Disassembly
The disassembly process will involve the handling of many parts (perhaps hundreds) ranging in physical size from the as small as a paperclip (throttle linkages & tiny fasteners) to the nearly the same size of the product (engine & pump housings). In order to accomplish this task with order and efficiency, a cohesive generalized model has been conceived (Figure 1).
Figure 1 Explained
- Identify the Next Part to be Removed
- Decide which part is the next logical part to be removed. Begin with the largest systems and then recursively dissect the contained subsystems and assemblies.
- Preparation for Removal
- Includes identifying the required tools, considering special techniques that may be required (for seized connections or fragile components), and assigning a part number.
- Part Removal
- Includes the removal of the part, and also documenting the process in writing.
- Part Cataloging
- Includes cleaning, photographing, and labeling of the part.
Upon initial investigation of the proposed model it's apparent that the first step is to identify the next part to be removed. However, its iterative (cyclic) nature is intended to be exploited. We expect to find that as we become more experienced with working together as a team, it will be possible for more than one step to be executed simultaneously.
Assembly
The Assembly process is expected to be executed in the reverse order of disassembly according to the same model with just a few differences to clarify. In similar fashion to the presentation of the disassembly process, Figure 2 depicts the proposed Generalized Assembly Procedure and discussion follows.
Figure 2 Explained
- Identify the Next Part to be Assembled
- Reference documentation to determine which part is the next part to be assembled. Retrieve the part from storage by part number.
- Preparation for Assembly
- Includes identifying the required tools, considering special techniques that may be required (torque specifications, lubrication requirements, and/or thread sealant/thread-locking treatments), and referencing pre-disassembly photos.
- Part Assembly
- Includes the assembly of the part.
- Validation of Proper Assembly
- Refer to pre-disassembly photos for visual validation, and inspect assembly for proper functionality.
Specific Challenges & Requirements
Any well-thought plan is susceptible to the misfortune of encountering unforeseen challenges and requirements that can impede progress. This section's focus is to specifically identify such challenges and requirements.
Challenges
Through an initial inspection of the Homelite fluid pump, we identified challenges of two different classifications. There are general challenges that would be present in the dissection of products with similar mechanical complexity, and there are also particular challenges that will be faced in the dissection of our product specifically.
In general, with any product of similar mechanical complexity, there are many challenges that result from the gross quantity of parts incorporated in the product's design. Merely looking at the product externally, more than 50 fasteners and more than 20 parts can be identified. Both group members who have previous hands-on experience with mechanics (Alex and Mark) agree that this external visual inspection is only showing us the "tip of the iceberg" pertaining to the total number of parts involved in this product.
The high number of parts involved presents challenges in dissection that will test the group's operational efficiency and organizational skills. Efficient disassembly and assembly of the product will necessitate optimal coordination of the group members' tasks in real-time. Without this efficiency, much time can be wasted, and time will be one of the group's most valuable resources in completing the project -- especially when posed with other challenges.
In particular, the Homelite fluid pump that is the subject of dissection, presents another challenge. Because it is not a brand-new product, it is dirty, rusty, and some parts appear to be worn-out and/or slightly damaged. Explanations of these challenges follow.
- Dirty Parts
- Built-up dirt and oily grime can visually impede the disassembly of the product by masking the appearance of the assembly. In some instances, parts may not be visible at all, and in other cases, unique parts may appear to be the same part if seams are covered by grime.
- Rusty Parts
- Rust is clearly evident in the base of the fluid pump. Other corrosion may also exist. Rust can contribute to the same challenges mentioned above for Dirty Parts, but also comes with its own subset of nuances. Rust and corrosion can weaken material, leaving parts prone to breaking, and also corrosion can "weld" mating parts together, making them difficult to separate.
- Worn Parts
- Some fasteners appear to be very worn. A potential challenge in removing worn fasteners is the potential for the head to strip. This must be considered when removing all fasteners.
- Slightly Damaged Parts
- For slighly damaged parts like a bent throttle linkage, the removal of such parts may not be routine. Removing a bent linkage may require bending the linkage back into its intended shape before removal is possible.
Requirements
Many materials will be required for dissection. This section clarifies these requirements by the categories Disassembly and Documentation in the following tables.
| Item | Details | Purpose
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|---|---|---|
| Work Table |
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| Bench Vise |
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| Flat-Head Screwdrivers |
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| Phillips-Head Screwdrivers |
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| Sockets (General) |
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| Sockets (Specialty) |
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| Socket Wrenches |
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| Combination Wrenches |
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| Plyers |
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| Materials to aid in removal of stubborn fasteners |
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| Tools to aid in removal of broken fasteners |
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| Cleaning Supplies |
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| Item | Details | Purpose |
|---|---|---|
| 3-Ring Binder |
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| Digital Camera |
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| Masking Tape |
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| Permanent Markers |
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| Index Cards |
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Group Member Evaluation
It is very important to assess the status of individual group members' strengths and weaknesses in order to appropriately utilized the group's human assets and identify personal attributes that may require special attention for growth and improvement. The following table presents these strengths and weaknesses.
| Group Member | Strengths | Weaknesses |
|---|---|---|
| Abner Bogan |
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| Alex Keller |
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| Alberto Santiago |
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| Hamlet Spencer |
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| Mark Tomaszewski |
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