Group 35 - Leaf Blower Engine - Revision history

MAE277 35 09 at 23:53, 15 December 2009

2009-12-15T23:53:07Z

MAE277 35 09 at 23:51, 15 December 2009

2009-12-15T23:51:13Z

MAE277 35 09 at 23:36, 15 December 2009

2009-12-15T23:36:34Z

MAE277 35 09: /* Design Revisions */

2009-12-15T16:05:56Z

Design Revisions

MAE277 35 09: /* Design Revisions */

2009-12-15T15:59:58Z

Design Revisions

MAE277 35 09 at 15:48, 15 December 2009

2009-12-15T15:48:45Z

MAE277 35 09: /* Introduction */

2009-12-15T15:46:43Z

Introduction

MAE277 35 09 at 15:34, 15 December 2009

2009-12-15T15:34:12Z

MAE277 35 09 at 15:33, 15 December 2009

2009-12-15T15:33:04Z

MAE277 35 09 at 15:30, 15 December 2009

2009-12-15T15:30:11Z

@@ Line 256: / Line 256: @@
 | align="center"| stamped
 | align="center"|not provided
-| align="center"| n/a
+| align="center"| N/A
 | align="center"|1
 | align="center"|Functional
@@ Line 480: / Line 480: @@
 '''Failure Modes and Effects Analysis (FMEA)'''
-*'''Probability''' – The loss of compression is one of the highest causes of horsepower loss in any internal combustion engine. The probability of failing is strongly dependant on the age of that particular combustion engine and how hard it was used.
+*'''Probability''' – The loss of compression is one of the highest causes of horsepower loss in any internal combustion engine. The probability of failing is strongly dependent on the age of that particular combustion engine and how hard it was used.
 *'''Severity''' – The compression loss strongly affects the performance of the engine; if the compression is low enough, the engine wouldn’t start therefore failures are common.  However if the compression fails, the engine would still be able to perform, but not at its peak.

@@ Line 6: / Line 6: @@
 ==='''Executive Summary'''===
-The leaf blower engine discussed below underwent a multitude of dissection, analysis, and reconstruction.  A seamless flow of inter-working component precision allows for this seemingly simple devise to function in a useful way.  Our dissection of the product enforced our basic understanding of the engine.  Through diligent dissection the engine was completely stripped down to its individual key components.   Each part was thoroughly examined and studied thereby completing our mental picture of the system as a whole.  With an excellent understanding of the engine and its real world functionality, several constructive suggestions were informally proposed.  In accordance with our technical knowledge of the engine and the leaf blower system researched on its consumer website, it is believed that our ideas for improvement could make for a more ideal product.
+The leaf blower engine discussed below underwent a multitude of dissection, analysis, and reconstruction.  A seamless flow of inter-working component precision allows for this seemingly simple devise to function in a useful way.  Our dissection of the product enforced our basic understanding of the engine.  Through diligent dissection, the engine was completely stripped down to its individual key components.   Each part was thoroughly examined and studied thereby completing our mental picture of the system as a whole.  With an excellent understanding of the engine and its real world functionality, several constructive suggestions were informally proposed as design revisions.  In accordance with our technical knowledge of the engine and the leaf blower system researched on its Homelite consumer website (see Reference), it is believed that our ideas for improvement could make for a more ideal product.
 =='''Request for Proposal'''==
@@ Line 14: / Line 14: @@
 '''Causes for Corrective Action'''
 <br>
-Essentially our work proposal and management proposals have gone according to the plan. All of our group members have contributed evenly, including meeting regularly and working in a timely fashion. The work is divided evenly according to each group members’ strengths. As far as our disassembly process as described in our work proposal, we were mostly accurate. Some of the tools outlined were not required. The tools required for this are flathead and Phillips head screw drivers of various sizes, metric sockets and wrench set, needle nose pliers, hex (torx) keys, and allen keys, all of various sizes. What we used were the metric sockets and wrench set, need nose pliers and torx wrenches, and Phillips head screw driver. We didn’t use the allen keys, or the flat head screwdriver.  The time we proposed it would require was a slightly over estimated. “The whole process of disassembly should not take longer than one to two hours, as it is a small engine.” The process was only around 45 minutes, for disassembly and disassembly.
+Essentially our work proposal and management proposals have gone according to the plan. All of our group members have contributed evenly, including meeting regularly and working in a timely fashion. The work is divided evenly according to each group members’ strengths. As far as our disassembly process as described in our work proposal, we were mostly accurate. Some of the tools outlined were not required. “The tools required for this are flathead and Phillips head screw drivers of various sizes, metric sockets and wrench set, needle nose pliers, hex (torx) keys, and allen keys, all of various sizes.” What we used were the metric sockets and wrench set, need nose pliers and torx wrenches, and Phillips head screw driver. We didn’t use the allen keys, or the flat head screwdriver.  The time we proposed it would require was a slightly over estimated. “The whole process of disassembly should not take longer than one to two hours, as it is a small engine.” The process was only around 45 minutes, for disassembly and reassembly.
 ===Product Dissection Plan===
@@ Line 167: / Line 167: @@
 | align="center"|Metal Stamping
 | align="center"|not provided
-| align="center"| n/a
+| align="center"| N/A
 | align="center"|2
 | align="center"| Functional
@@ Line 179: / Line 179: @@
 | align="center"|Injection Molding
 | align="center"|not provided
-| align="center"| n/a
+| align="center"| N/A
 | align="center"|2
 | align="center"|Functional
@@ Line 191: / Line 191: @@
 | align="center"|Die Casting
 | align="center"|not provided
-| align="center"| n/a
+| align="center"| N/A
 | align="center"|1
 | align="center"|Functional
@@ Line 205: / Line 205: @@
 | align="center"|Investment Casting
 | align="center"|not provided
-| align="center"| n/a
+| align="center"| N/A
 | align="center"|5
 | align="center"|Functional
@@ Line 217: / Line 217: @@
 | align="center"|Die Casting
 | align="center"|not provided
-| align="center"| centripetal
+| align="center"| Centripetal
 | align="center"|3
 | align="center"|Functional
@@ Line 230: / Line 230: @@
 | align="center"|assembled by hand
 | align="center"|not provided
-| align="center"| n/a
+| align="center"| N/A
 | align="center"|5
 | align="center"|Functional
@@ Line 240: / Line 240: @@
 | align="center"|1
 | align="center"|Aluminum
-| align="center"|The cylinder is a place for  the gases to combust, from the pressure provided by the piston and the spark provided by the ignition system.
+| align="center"|The cylinder is a where the combustion takes place of the air and gas mixture, from the pressure provided by the piston and the spark provided by the ignition system.
 | align="center"|Die Casting
 | align="center"|06825
-| align="center"|compressive
+| align="center"|Compressive
 | align="center"|3
 | align="center"|Functional
@@ Line 268: / Line 268: @@
 | align="center"|Die Casting
 | align="center"|not provided
-| align="center"|compressive
+| align="center"|Compressive
 | align="center"|3
 | align="center"|Functional
@@ Line 280: / Line 280: @@
 | align="center"|Die Casting
 | align="center"|not provided
-| align="center"|tensil
+| align="center"|Tensile
 | align="center"|3
 | align="center"|Functional
@@ Line 292: / Line 292: @@
 | align="center"|Die Casting
 | align="center"|not provided
-| align="center"| compressive
+| align="center"| Compressive
 | align="center"|4
 | align="center"|Functional
@@ Line 304: / Line 304: @@
 | align="center"|
 | align="center"|not provided
-| align="center"|centripetal
+| align="center"|Centripetal
 | align="center"|3
 | align="center"|Functional
@@ Line 316: / Line 316: @@
 | align="center"|Die Casting
 | align="center"|not provided
-| align="center"| shear and comopressive
+| align="center"| Shear and Compressive
 | align="center"|2
 | align="center"|Functional

@@ Line 14: / Line 14: @@
 '''Causes for Corrective Action'''
 <br>
-Essentially our work proposal and management proposals have gone according to the plan. All of our group members have contributed evenly, including meeting regularly and working in a timely fashion. The work is divided evenly according to each group members’ strengths. As far as our disassembly process as described in our work proposal, we were mostly accurate. Some of the tools outlined were not required. ” The tools required for this are flathead and Phillips head screw drivers of various sizes, metric sockets and wrench set, needle nose pliers, hex (torx) keys, and allen keys, all of various sizes.” What we used were the metric sockets and wrench set, need nose pliers and torx wrenches, and Phillips head screw driver. We didn’t use the allen keys, or the flat head screwdriver.  The time we proposed it would require was a slightly over estimated. “The whole process of disassembly should not take longer than one to two hours, as it is a small engine.” The process was only around 45 minutes, for disassembly and disassembly.
+Essentially our work proposal and management proposals have gone according to the plan. All of our group members have contributed evenly, including meeting regularly and working in a timely fashion. The work is divided evenly according to each group members’ strengths. As far as our disassembly process as described in our work proposal, we were mostly accurate. Some of the tools outlined were not required. The tools required for this are flathead and Phillips head screw drivers of various sizes, metric sockets and wrench set, needle nose pliers, hex (torx) keys, and allen keys, all of various sizes. What we used were the metric sockets and wrench set, need nose pliers and torx wrenches, and Phillips head screw driver. We didn’t use the allen keys, or the flat head screwdriver.  The time we proposed it would require was a slightly over estimated. “The whole process of disassembly should not take longer than one to two hours, as it is a small engine.” The process was only around 45 minutes, for disassembly and disassembly.
 ===Product Dissection Plan===

@@ Line 335: / Line 335: @@
 ===Design Revisions===
 . A slight increase in engine displacement would be increase power, resulting in a more powerful leaf blower. With more blowing power, the user will be more satisfied in the product because of it's increased efficiency. This would be done in the beginning of the design process, and would not be overly expensive addition. The slight increase in cost would be made up for an increase in sales due to a more capable leaf blower.
 <br>
 . A higher quality exhaust would not only be a good improvement for the user, but any one in the vicinity of the leaf blower. The current exhaust system is a simple aluminum shell, that is supposed to have a packing material inside, however ours is missing. To replace this with a tubed exhaust with a silencer would greatly decrease the sound output of the motor. The addition of a higher quality exhaust could be fairly expensive in comparison to the current design, due to the current design being so primitive, but having a more muffled engine is in the interest of users and neighbors alike.
 <br>
 . There is a plastic spacer between the carburetor and the cylinder. It could easily be eliminated by making a slight design revision in the carburetor. Doing this would decrease production costs because the part would no longer be necessary. Having a less complex product, is in the interest of the manufacturer because it eases in the manufacturing and design process, and also cuts down on cost.
 <br>

@@ Line 334: / Line 334: @@
 |}
 ===Design Revisions===
-. A slight increase in engine displacement would be increase power, resulting in a more powerful leaf blower. With more blowing power, the user will be more satisfied in the product because of it's increased efficiency.
+. A slight increase in engine displacement would be increase power, resulting in a more powerful leaf blower. With more blowing power, the user will be more satisfied in the product because of it's increased efficiency. This would be done in the beginning of the design process, and would not be overly expensive addition. The slight increase in cost would be made up for an increase in sales due to a more capable leaf blower.
 <br>
-. A higher quality exhaust would not only be a good improvement for the user, but any one in the vicinity of the leaf blower. The current exhaust system is a simple aluminum shell, that is supposed to have a packing material inside, however ours is missing. To replace this with a tubed exhaust with a silencer would greatly decrease the sound output of the motor
+. A higher quality exhaust would not only be a good improvement for the user, but any one in the vicinity of the leaf blower. The current exhaust system is a simple aluminum shell, that is supposed to have a packing material inside, however ours is missing. To replace this with a tubed exhaust with a silencer would greatly decrease the sound output of the motor. The addition of a higher quality exhaust could be fairly expensive in comparison to the current design, due to the current design being so primitive, but having a more muffled engine is in the interest of users and neighbors alike.
 <br>
-. There is a plastic spacer between the carburetor and the cylinder. It could easily be eliminated by making a slight design revision in the carburetor. Doing this would decrease production costs because the part would no longer be necessary.
+. There is a plastic spacer between the carburetor and the cylinder. It could easily be eliminated by making a slight design revision in the carburetor. Doing this would decrease production costs because the part would no longer be necessary. Having a less complex product, is in the interest of the manufacturer because it eases in the manufacturing and design process, and also cuts down on cost.
 <br>

← Older revision		Revision as of 15:48, 15 December 2009
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	=='''References'''==		=='''References'''==
		+
		+	http://www.cpohomelite.com/products/zr08550.html

← Older revision		Revision as of 15:34, 15 December 2009
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		+
		+	=='''Request for Proposal'''==
	[http://gicl.cs.drexel.edu/wiki/Group_35_-_Leaf_Blower_Engine_gate1 Request For Proposal]		[http://gicl.cs.drexel.edu/wiki/Group_35_-_Leaf_Blower_Engine_gate1 Request For Proposal]
−	~~=='''Request for Proposal'''==~~
−	~~===Work Proposal===~~
−	Our plan for reverse engineering will start with disassembly of the engine. We will first remove all exterior components. Once the engine is broken down to its main components, we can begin complete disassembly. The tools required for this are flathead and Phillips head screw drivers of various sizes, metric sockets and wrench set, needle nose pliers, hex keys, and allen keys, all of various sizes. The whole process of disassembly should not take longer than one to two hours, as it is a small engine. The group has members that are capable of the process, however, the ones that aren’t, will be able to learn as we go. We don’t expect to encounter any shortcomings during the disassembly
−	~~<br>~~
−	~~===Management Proposal===~~
−	Our group plans to manage our work by meeting regularly, and working consistently. Our planned meeting times thus far are Tuesday at 3:30 pm, Thursday at 4:30 pm, and Wednesdays after 5 pm. All meetings will be held in the dissection lab or the library. Our plan to meet the project requirements are discussed in the Gantt chart provided. The members in charge of assembly and disassembly are Jeff Scipioni and Chandrishka J De Silva. Our group member in charge of the Wikipedia page will be Seth Hughes, and the group leaders in charge of time management and overview are Gennady Agapov and Zelu Xu.
−	~~<br><br>~~
−	~~'''Group Roles'''~~
−	*'''Gennady Agapov''': Gantt Chart, Wiki Page Editor
−
−	*'''Seth Hughes''': Pictures and Charts, Solid Modeling
−
−	*'''Zelu Xu''': Wiki Page Editor
−
−	*'''Jeff Scipioni''': Assembly/Disassembly, Wiki Page Editor
−
−	*'''Chandrishka J. De Silva''': Pictures and Charts Wiki Page Editor
−	~~<br>~~
−	~~'''Group Advantages'''~~
−	*Small engine experience
−	*Diversity
−	*Teamwork and communications
−	~~<br>~~
−	~~'''Group Disadvantages'''~~
−	*No solid modeling experience
−	*Nor previous wiki page editing experience
−	*Had to make sacrifices such as missing work in order to have meetings and meet deadlines
−	~~<br>~~
−
−	~~===Inital Product Assessment===~~
−	The intended use of this product is to clear leaves and other debris from a lawn or surrounding property. The leaf blower has both professional and residential applications. Professionally, its widely used in the landscaping world. Residentially, its used to maintain cleanliness around the home. The leaf blower has only one function and that is to clear debris. Aside form this, it has no other practical functions.
−	~~<br><br>~~
−	A person manually pulls the rip cord which simultaneously draws an air, oil, fuel mixture into the cylinder and creates a spark. The cylinder is compressed. Combustion occurs when the compressed mixture is ignited by the spark. The explosion causes motion in the cylinder which creates motion. This motion turns the shaft which is connected to the fan creating an air flow. Mechanical work comes from the pulling of the rip cord, the cylinder, the turning of the shaft and the turning of the fan. Electrical energy comes from the coil and magnets. Mechanical energy which draws in the fuel and compressed the cylinder is transformed to chemical energy when the mixture is ignited. This chemical combustion returns to mechanical energy pushing back the cylinder, which turns the shaft and fan. A portion of all these energies is transformed into heat energy. The coil and magnet electrical energy which produces the spark is transformed into chemical energy to ignite the mixture.
−	~~<br><br>~~
−	The leaf blower engine is not currently functioning due to the lack of various components such as the rip cord, casing, and kill switch. It is impossible to tell how well the leaf blower runs dues to the lack of critical components. We did not observe and potential problems other than the missing of certain components.
−	~~<br><br>~~
−	If we were to look at this product on a scale of complexity, it would be seen as about a two or three out of ten. A zero would be something like an air compressor machine, where a ten would include items like an automobile engine. Twelve components were observed. These include the spark plug, exhaust, cylinder, piston, connecting rod, crank, rip cord, carburetor, gas tank, air filter, cover piece, and the shaft. In terms of complexity the carburetor is the most intricate due to its numerous sub components. Simplest would be the cover piece which stays in place, holding components together. Components such as the crank, spark plug, exhaust, cylinder and piston are relatively simple. Slightly less complex than these include the connecting rod, pull cord, gas tank, filter and shaft.
−	~~<br><br>~~
−	Aluminum, plastic, steel, rubber, ceramic, copper, and foam make up the material used to manufacture the leaf blower engine. All these materials are clearly visible. Based on our observations we believe all the listed materials are used for the internal workings of the leaf blower engine.
−	~~<br><br>~~
−	We would be happy using this product due to its efficiency and accessibility. The product is comfortable to use compared to a rake. The product is relatively user friendly. It must be supplied with a sufficient amount of fuel, regular maintenance is necessary and the air filter must be occasionally changed.
−	~~<br><br>~~
−	Comparative products to the leaf blower include the rake and back pack leaf blowers. The rake requires more manual labor as there are no moving parts. The back pack leaf blower is more powerful than the traditional leaf blower. For an ordinary leaf blower one would expect to pay between fifty and one hundred dollars. A rake can be purchased for roughly ten dollars. The back pack leaf blower, however, can cost up to four hundred dollars. The advantages to using a rake include low maintenance of the product and its relatively inexpensive. The back pack leaf blower is much more powerful than an ordinary leaf blower, which means work can be done more effectively. The disadvantages of using a rake include the fact that its labor intensive and much slower than with a leaf blower. A back pack leaf blower is very costly and heavy.
−	~~<br><br>~~
−	~~[[Image:gant chart.jpg]]~~

	=='''Preliminary Design Review'''==		=='''Preliminary Design Review'''==

@@ Line 9: / Line 9: @@
-[http://gicl.cs.drexel.edu/wiki/Group_35_-_Leaf_Blower_Engine_gate1 proposal]
+[http://gicl.cs.drexel.edu/wiki/Group_35_-_Leaf_Blower_Engine_gate1 Request For Proposal]
 =='''Request for Proposal'''==
 ===Work Proposal===

← Older revision		Revision as of 15:30, 15 December 2009
Line 9:		Line 9:


		+	[http://gicl.cs.drexel.edu/wiki/Group_35_-_Leaf_Blower_Engine_gate1 proposal]
	=='''Request for Proposal'''==		=='''Request for Proposal'''==
	===Work Proposal===		===Work Proposal===