Alligator Lopper: Gate3 - Revision history

MAE 277 2012 - Group 22: /* Project Management */

2012-12-14T04:20:17Z

Project Management

MAE 277 2012 - Group 22: /* Summary */

2012-12-14T04:19:33Z

Summary

MAE 277 2012 - Group 22: /* Design Revisions */

2012-12-14T04:13:49Z

Design Revisions

MAE 277 2012 - Group 22: /* Gate 3 */

2012-11-16T20:20:17Z

Gate 3

MAE 277 2012 - Group 22: /* Gate 3 */

2012-11-16T20:03:36Z

Gate 3

MAE 277 2012 - Group 22: /* Gate 3 */

2012-11-16T20:00:03Z

Gate 3

MAE 277 2012 - Group 22: /* Component Table */

2012-11-16T17:39:15Z

Component Table

MAE 277 2012 - Group 22: /* Component Table */

2012-11-16T17:38:55Z

Component Table

MAE 277 2012 - Group 22: /* Component Table */

2012-11-16T17:37:56Z

Component Table

MAE 277 2012 - Group 22: /* Component Table */

2012-11-16T17:36:54Z

Component Table

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 =Gate 3=
-==Project Management==
+== Project Management ==
 As a group, we have learned to manage our time as to dedicating the required amount to the work of this project.

← Older revision		Revision as of 04:19, 14 December 2012
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−	== ~~Summary~~ ==	+	== Material and Manufacturing Importance ==

	While disassembling the product it became apparent that the intended use of each component was indicated by both the material used in making the component and also the way in which it was manufactured. The material itself can only withstand so many forces until it ultimately yields so choosing the correct material for each component is imperative to the length of the product’s lifetime. In addition, manufacturing processes have a large impact not only on product durability but also its production costs. Black and Decker had to consider both of these factors when designing the Lopper for residential homeowner use.		While disassembling the product it became apparent that the intended use of each component was indicated by both the material used in making the component and also the way in which it was manufactured. The material itself can only withstand so many forces until it ultimately yields so choosing the correct material for each component is imperative to the length of the product’s lifetime. In addition, manufacturing processes have a large impact not only on product durability but also its production costs. Black and Decker had to consider both of these factors when designing the Lopper for residential homeowner use.

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 The safety of the wiring from the power source to the product will increase. Pulling on the cord by accident will result in the portion of the extension cord looped around the tether to take the force, not the cord clamp currently holding the black cord in the handle of the Lopper. There is no risk that the cord will fray over time at the point where it enters the handle since there will be no external wiring at all. The possibility that the user can come into contact with the frayed cord near the handle is removed since no such cord would exist. This drastically reduces the risk of the user being shocked by the external wiring of the Lopper increasing its overall safety effectiveness.
 ==Navigate to Homepage==
 [http://gicl.cs.drexel.edu/wiki/Group_22_-_Black_%26_Decker_Alligator_Lopper Alligator Lopper Homepage]

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 	The lopper’s success is determined by its output, abilities, and dependence on the job. Breaking the product down into its many components allowed us to isolate each one and determine its significance to the success of the overall function. We chose the drive gears and sprocket component as our subject for engineering analysis. We felt it was necessary to put this component through its paces and derive more data and information about the component and its service to the overall product. The gears integrate nearby components that make up the composition of the entire power drive of the product. Rotational energy from the motor is translated into cutting power in the outdoors. These gears must stand up to the rigor of heavy duty workloads, which means high RPMs and torques applied to the teeth of the gears and sprocket. Through analysis, we intend to discover just how much of an impact that the gear ratios have on the power and velocity output of the motor and its translation into the chain’s abilities. The gears must combine to produce the proper output of power and velocity in order for the chain to perform sufficiently. Engineering analysis gives us a clear idea of the methods of study to help us determine the ratio that is present, as well as an optimal one.
 PROBLEM STATEMENT
 	Determine the proper gear ratio between the motor output shaft and the larger gear such that the sprocket will turn with sufficient angular velocity and rotational force to propel the chain saw in a linear direction suitable for effective cutting ability.
 DIAGRAM
 [[File:Gear_Ratio.png]]

← Older revision		Revision as of 20:03, 16 November 2012
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	Determine the proper gear ratio between the motor output shaft and the larger gear such that the sprocket will turn with sufficient angular velocity and rotational force to propel the chain saw in a linear direction suitable for effective cutting ability.		Determine the proper gear ratio between the motor output shaft and the larger gear such that the sprocket will turn with sufficient angular velocity and rotational force to propel the chain saw in a linear direction suitable for effective cutting ability.

		+	DIAGRAM
		+
		+	[[File:Gear_Ratio.png]]

← Older revision		Revision as of 20:00, 16 November 2012
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	[[File:Assembly_Exploded_3.jpg\|thumb\|center\|400px\|This is the total exploded assembly viewed from a different angle.]]		[[File:Assembly_Exploded_3.jpg\|thumb\|center\|400px\|This is the total exploded assembly viewed from a different angle.]]
		+
		+
		+
		+
		+	== Engineering Analysis ==
		+
		+	INTRODUCTION
		+
		+	The lopper’s success is determined by its output, abilities, and dependence on the job. Breaking the product down into its many components allowed us to isolate each one and determine its significance to the success of the overall function. We chose the drive gears and sprocket component as our subject for engineering analysis. We felt it was necessary to put this component through its paces and derive more data and information about the component and its service to the overall product. The gears integrate nearby components that make up the composition of the entire power drive of the product. Rotational energy from the motor is translated into cutting power in the outdoors. These gears must stand up to the rigor of heavy duty workloads, which means high RPMs and torques applied to the teeth of the gears and sprocket. Through analysis, we intend to discover just how much of an impact that the gear ratios have on the power and velocity output of the motor and its translation into the chain’s abilities. The gears must combine to produce the proper output of power and velocity in order for the chain to perform sufficiently. Engineering analysis gives us a clear idea of the methods of study to help us determine the ratio that is present, as well as an optimal one.
		+
		+	PROBLEM STATEMENT
		+
		+	Determine the proper gear ratio between the motor output shaft and the larger gear such that the sprocket will turn with sufficient angular velocity and rotational force to propel the chain saw in a linear direction suitable for effective cutting ability.
		+
		+
		+

	== Design Revisions ==		== Design Revisions ==

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 | style="border-style: solid; border-width: 1px"| The coil of the motor is made up of bunched copper coils. It spins within the magnet when an electric charge is introduced. This is done with two Brush Assemblies which introduce a charge to the coil. When this happens, the coil unit spins. This coil is attached to a drive shaft so that when it does spin, it powers the gear and in turn the sprocket and chain.
 | style="border-style: solid; border-width: 1px"| The motor coil is made through die casting, drawing and assembly.  Drawing is generally used for wires.  It is done by pulling the material through a diet to obtain the desired shape.
-| style="border-style: solid; border-width: 1px"|4
+| style="border-style: solid; border-width: 1px"|5
 |-
 |}

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 | style="border-style: solid; border-width: 1px"| The component is almost like a cap that is hollow and set up with springs under it. This material is made out of plastic and is relatively light weight. This component is black which sets it apart from the other orange parts. It is a different color because it performs one of the main functions. It does not really have an aesthetic finish. The component is approximately 4 X 1 X 1 inches. The components shape is appropriate to how it is meant to perform.  Since the inside is empty it has the ability to fit the springs which will be pushing against the switch when needed.
 | style="border-style: solid; border-width: 1px"| Injection Molding. Some evidence that supports this is that it is made out of plastic which is the material generally used in injection molding.  Riser marks and parting lines are also seen on the material which further proves that it was made in this way. The shape of the trigger definitely influenced the way that it was made because there are two identical triggers on each chainsaw and injection molding is one of the best ways to speed up production if a mold is being reused.
-| style="border-style: solid; border-width: 1px"| ****
+| style="border-style: solid; border-width: 1px"| 3
 |-
 | style="border-style: solid; border-width: 1px"| Chain

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 | style="border-style: solid; border-width: 1px"| The wire housing center is intended to keep the wires away from exposure and maintain the safety of the product.
 | style="border-style: solid; border-width: 1px"| This small housing cover is located on the outside of the actual handles. It is held in place by a Philips head screw. Once removed, the user is given access to the connection where the wires running from external cord are joined with the wires used internally within the Alligator Lopper. There is only one wire housing cover used within the entire product
-| style="border-style: solid; border-width: 1px"| The small housing cover is made through injection molding
+| style="border-style: solid; border-width: 1px"| The small housing cover is made through injection molding.  This can be proved with the parting lines and riser marks on the component.
 | style="border-style: solid; border-width: 1px"| 3
 |-