Chart: Component Summary
Name & No.
|Function||Material(s) Used in Manufacturing Component||Manufacturing Process||Functional or Cosmetic?||Component's Shape||Grade of Complexity||Image|
|Protects the user from the heat generated by the engine unit during operation
Channels the escape of heat through slits.
|Heavy mold of plastic.||Molding process||Functional||Curvilinear; lacks considerable thickness in material||2:
Mold manufacture does not involve excessive operations.
No sub-components involved.
Air Filter Kit
|Separates particulate matter from air intake that may interfere with the effective and designed operation of the carburetor.||Filter consists of petroleum-derived product.
Air Filter cover is constituted of plastic.
|Chemical processes involving polymer cultivation for lightweight cellular byproduct (foam).
For Air Filter cover, it is a process of plastic molding.
|Functional||Cellular foam filter exhibits a rectangular prism.
Can be regarded as either concave or convex; curvilinear.
For cellular filter, manufacture is comprised of chemical and mechanical processes.
Critical to the functionality of the product.
Of the Air Filter Kit, the cellular foam can construed as a sub-component, but in this category it resides alone.
Torx Screws with Regular & Lock Washers (top image)
Torx Screws (bottom image)
Torx screws with Regular and Lock washers fasten components to each other or onto the product.
Lock washers enable fastener to secure to a position undergoing vigorous vibration more tightly than Regular washers provide.
|Steel||Screws mass manufactured using "Thread Rolling" method.
Washers produced via stamping mechanism.
Screws are mass manufactured, a process involving limited operations.
Necessarily indispensable for the product to hold together.
Torx Screws are attended by Regular and Lock washers.
|Seals the Short Block||Steel||Steel casting for Crankcase cover.
Extrusion and threading of holes.
|Functional||Comparatively flat, rectangular plate with filleted edges.
A cylindrical recess, and for threaded holes, 2 on the flank of each of the circle's two semi-circles.
Manufacture requiring casting involves methodical process.
Functionally essential: The Short Block must be sealed to preclude any internal leaks the operation of the product.
No sub-components involved.
|Provides a tank for storing needed fuel and filtering the fuel.||Plastic||Molded and then trimmed to proper shape.||Functional||Defies expression||2:
Manufacturing process not difficult.
Contribution to functionality somewhat important.
No other parts.
|Muffles the intense sound waves generated by internal combustion process.
Provides path for exhaust.
|Die casting for muffler encasing; cold working for steel screws, more than likely from austenitic steel.||Functional||Defies Expression||2:
Manufacturing process not highly involved or time-consuming.
Functionality somewhat important.
No sub-components involved.
|Mixing chamber for fuel and air.
Throttles mixture into Engine Head at a controlled rate.
|Aluminum body with stainless steel plates, and rubber “bubble” used for manual fuel injection.
Plastic choke handle
Bronze throttling flap and fuel pipes.
|Die casted, and then machined on all sides and surfaces.||Functional||Cubic||
Materials very abundant, leading to a long manufacturing process.
Functionality: Highly imperative.
Contains many sub- components, including path for fuel.
|As the gasket to the carburetor, it seals the aperture covered by the gasket to the Heat Dam.
Prevents interstitial leaks between connected components.
|Asbestos, or a kindred compound||Molding process||Functional (arguably cosmetic as well, considering its unique rounded-edge, parallelogram-like figure)||Rounded-edge, parallelogram-like figure with two pairs of holes of two differing diameters, and a larger diameter at the center of the gasket.||
Development of asbestos-constituting chemical compounds involves an extensive sequence of operations dealing with chemical engineering, followed by the molding mechanism whereby it achieves its intended shape.
Functionally critical: Prevents catastrophic oil leaks from damaging internal components of the engine area.
No other sub-components involved.
|Provide buffer between carburetor and engine head.
Prevents heat transfer to carburetor.
|Dense plastic||Molded||Functional||Defies expression||2:
Functionality only a precaution.
Manufacturing process not highly intricate, but rapid.
No sub-components involved.
Piston/Connecting Rod Assembly
|Provides compression and transmits mechanical energy to the shaft.||Aluminum||Milled
This component requires high precision for smooth motion within engine head.
|Functional||Piston: Cylindrical rod, which resembles a “Dog-bone” figure with both ends shaped as holes.||4:
Long manufacturing process due to high precision requirements and its function being very critical to the product’s operation.
|Delivers a spark to the combustion chamber, enabling ignition.||Aluminum||Casted||Functional||Cylindrical||3:
Indispensable in terms of functionality.
Manufacturing Process involves a series of operations.
Corresponds with ignition coil.
Engine Head (Cylinder)
|Provides a chamber for combustion and path of motion for piston.
Also has ports for fuel and exhaust.
|Aluminum||Exterior: Die casting implemented in a two-piece form and merged together.
Interior: High precision machining for piston; three threaded holes.
|Functional||Rectangular fins used for heat dissipation.
Cylindrical interior for seal with piston.
Very long/high precision manufacturing process.
Function importance is very high.
Exhaust and intake sub-components apparent (visible).
|Provides rotational motion for the line wound on the line spool.||Durable plastic||Molding process||Functional||Curvilinear, with a cylindrical, bulged protrusion at outer surface of the line spool.||
Manufacturing process involves molding mechanism where minimal operations are necessary.
Functionally critical in order to have the product deliver its designed end of scything grassy terrain with a rapidly gyrating line.
No sub-components included in setup.
Gear Head Assembly
Moving parts of Gear Head Assembly
|Convey rotational mechanical energy to the line spool via gyration of interlocking gears.||Steel, and much grease||Steel casting, followed by high-precision machining.||Functional||Cylindrical bases with angled teeth that serve as gears.
Encasing of assembly forms hollow enclosure.
Manufacturing process requires high-precision machining.
Indispensable in terms of functionality: The gears allow for the rotation of the line.
The two interlocking gears are the functionally important sub-components of the assembly.
|Shields both the product and the user from stray grass.||Steel||Steel casting
Extrusion, and threading for holes.
|Both functional and cosmetic||Somewhat akin to a "deep-sea diver's" fin, but with a large-diameter hole extruded at the filleted tip for mounting to the line trimmer||3:
Casting process and extrusion merit intricacy in the component's manufacture.
Not entirely functionally important: The line trimmer can operate without having this secured to it.
No visible sub-components.
Ignition Coil (Magneto)
|Provides electrical current to spark plug, thereby allowing spark plug to function.||Rubber insulators
|Undergoes a certain process performed in multiple steps.||Functional||Defies expression||3:
Important component, as measured by functionality.
Manufacturing process amounts to a comparatively swift operation.
Corresponds to the spark plug.
|Allows engine to idle without the line spool having to rotate.||Metal||Outer shell is die casted.
Inner rings are machined.
Not as important functionally, and manufacturing process does not involve many operations.
Rotor (Fly Wheel)
|Provides initial rotation necessary for ignition.
Magnetic component provides electric current for the spark plug.
|Aluminum, with steel clips||Die casted
Machined center hole for shaft fit, and groove for Woodruff Key.
|Functional||Tenuous cylindrical disk with curved fins.||
Manufacturing process complex due to fins.
Very important in terms of functionality.
Sub components not abundant.
Internal workings of Pull Cord configuration
|Provides for means of starting the line trimmer externally through user input.||Durable plastic, perhaps jute for the Pull Cord string, and cold-rolled steel for the Torx screws.||Molding process for the encasing and handle of Pull Cord.
Threading and weaving for Pull Cord string.
Mass manufacturing via "Thread Rolling" method for Torx screws.
|Both functional and cosmetic||Defies expression||
All components necessitate manufacturing mechanisms; however, they may vary among one another, do not prove very intricate and do not involve many machine operations.
Functionally essential, for the user requires the Pull Cord to achieve ignition of the line trimmer.
The solitary critical sub-component is the Pull Cord.
|Provides rotation and work transmitted from chemical energy.||Aluminum||Machined shoulder where bearings fit.
Serves a vital function to product.
Manufacturing process involves multiple operations.
No apparent sub-components.
|Enhances fastening.||Molded plastic||Molding mechanism is involved.||Functional||Flanged: self-explanatory||2:
Manufacturing involves molding process.
Component is functionally beneficial to fastening needs on the product.
Short Block (Crankcase)
|“The Main Frame” provides structure for mounting the Engine Head and the engine shaft.
Provides compartment for rotation
Machined surfaces where Engine Head connects for sealing.
Machined for low tolerance bearing fits, as well.
|Functional||Rounded, curvilinear around myriad bends, and cylindrical, among other applicable adjectives.||
Involves an in-depth manufacturing process.
Important to functionality of product.
Not too many sub-components directly involved, given it serves as a fixture for mounting components.