Microphone

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!1
!1
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| ||Ring ||2 ||attaches to mic end of boom shaft ||Steel ||Machining
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|[[Image:ring.jpg]] ||Ring (2x) ||2 ||attaches to mic end of boom shaft ||Steel ||Machining
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!2
!2
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| ||Boom shaft ||493 || ||''||Extrusion
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| ||Boom shaft ||493 ||Steel Pipe(mass includes counterweight) ||Steel||Extrusion
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!3
!3
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| ||Counterwieght || ||'' ||Casting
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| ||Counterweight || ||Solid||Steel ||Casting
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!4
!4
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| ||Mic holder ||10 ||'' ||Casting and machining ||
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| ||Mic holder ||10 ||''|| ||Casting and machining ||
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!5
!5
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!9
!9
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| ||Rubber pad (2X) ||8 ||goes inside #8 to hold #11 in place||Rubber||Molding
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| ||Rubber pad (2x) ||8 ||goes inside #8 to hold #11 in place||Rubber||Molding
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!10
!10
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!13
!13
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| ||Ring ||2 ||Identical to #1|| ||
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| ||Handle || ||Has a threaded hole in which the end of #10 is inserted||Steel||Casting and machining
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!14
!14
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| ||Handle || ||Has a threaded hole in which the end of #10 is inserted||Steel||Casting and machining
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| ||Thumbscrew ||3 ||Holds boom in place.  Goeas through hole in #11.  Has plastic nub so as not to scratch the boom ||Two kinds of plastic (head and nub) and steel (screw) ||Molding (plastic) and machining (steel)
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!15
!15
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| ||Thumbscrew ||3 ||Holds boom in place.  Goeas through hole in #11.  Has plastic nub so as not to scratch the boom ||Two kinds of plastic (head and nub) and steel (screw) ||Molding (plastic) and machining (steel)
 
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!16
 
| ||Wire clip ||2 ||Attaches to mic stand, used to hold wire in place ||Plastic ||Molding
| ||Wire clip ||2 ||Attaches to mic stand, used to hold wire in place ||Plastic ||Molding
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| cell 2,1 || Metal screen ||49 ||Made of a wire mesh attached to metal rings ||Steel ||Extrusion, weaving, ??(Don't know how rings are attached)
| cell 2,1 || Metal screen ||49 ||Made of a wire mesh attached to metal rings ||Steel ||Extrusion, weaving, ??(Don't know how rings are attached)
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== Design for Manufacturing and Assembly (DFMA) ==
== Design for Manufacturing and Assembly (DFMA) ==

Revision as of 17:15, 20 September 2009

Image:Microphone picture.jpg


Contents

Executive Summary

-Dan

Stakeholders

-Luo

User Study

-Nakul

Assembly

-Justin

Function of the System

Mechanical Analysis

-Nakul


Parts List

-Dan

Part Number Photo Part name Mass (g) Notes Material Manufacturing Method
1 Image:ring.jpg Ring (2x) 2 attaches to mic end of boom shaft Steel Machining
2 Boom shaft 493 Steel Pipe(mass includes counterweight) SteelExtrusion
3 Counterweight SolidSteel Casting
4 Mic holder 10 Casting and machining
5 Bolt A 3 holds mic holder to #7 Machining
6 Bolt B 2 #6 goes into #5
7 (part that screws onto boom) 12 ?? ???
8 (part that screws onto mic stand) 71 ?? ??
9 Rubber pad (2x) 8 goes inside #8 to hold #11 in placeRubberMolding
10 Bolt C 16 holds #8, #9, and #10 together Steel Machining
11 Boom holder 65 has a long hole in which the boom is inserted. Attaches to mic stand via #8 Casting and machining
12 Washer #10 goes throught this washerSteelStamping
13 Handle Has a threaded hole in which the end of #10 is insertedSteelCasting and machining
14 Thumbscrew 3 Holds boom in place. Goeas through hole in #11. Has plastic nub so as not to scratch the boom Two kinds of plastic (head and nub) and steel (screw) Molding (plastic) and machining (steel)
15 Wire clip 2 Attaches to mic stand, used to hold wire in place Plastic Molding


Part Number Photo Part name Masss(g) Notes Material Manufacturing Method
M1 cell 1,1 Switch slider <1 cell 1,2 Plastic Molding
M2 cell 2,1 Sticker A <1 Goes on M1 Plastic Stamped out of a thin sheet
M3 cell 2,1 Screw A (2X) <1 Holds switch electronics to the microphone body Steel Machining
M4 cell 2,1 Screw B <1 Atttaches gground pin to the back of the microphone body Machining
M5 cell 2,1 Body 187 Large, machined Metal Casting and machining, sandblasted finish
M6 cell 2,1 Rubber disc 2 Holds three pins in place Rubber Molding
M7 cell 2,1 Pin 1 Transmits signal from the microphone to the wire Metal  ?????
M8 cell 2,1 Switch electronics 3 Use physical user input from switch to affect electrical circuit Plastic housing, metal wire Molding (housing), extrusion (wire)
M9 cell 2,1 Foam cover <1 Covers the magnet and diaphragm Polymer foam ????
M10 cell 2,1 Plastic cover 2 Protects diaphragm and magnet Plastic Molding
M11 cell 2,1 Chip <1 Takes signal from coil (M13) and transmits it to the the pins. Is glued to a slot on M16 Silicon chip, copper conductors Chemical etching
M12 cell 2,1 Diaphragm <1 Made from a thin piece of plastic with a spiral stamped into it to give it better elastic properties Plastic Stamping
M13 cell 2,1 Coil <1 Thin insulated copper wire Copper Extrusion
M14 cell 2,1 Magnet 5 Attached to diaphragm Magnetic metal Casting
M15 cell 2,1 Sticker B <1 Covers cavity in the housing, below where the magnet sits Plastic Stamping
M16 cell 2,1 Housing 10 Holds parts M11-M15, the parts that actually convert sound into an electrical signal Plastic Molding
M17 cell 2,1 Wind screen <1 Made of a hollow foam ball. Inserted into the metal screen. Used to soften sounds of users' voices Polymer foam ????
M18 cell 2,1 Metal screen 49 Made of a wire mesh attached to metal rings Steel Extrusion, weaving, ??(Don't know how rings are attached)

Design for Manufacturing and Assembly (DFMA)

-Dan and Justin

-Improve ease of disassembly for repair


Failure Modes and Effects Analysis

Considering ways in which a product could potentially fail is a crucial part of the design process. All products must be designed such that they are both safe and reliable for use and any potential dangers must be addressed in the design phase.

Assembly/Parts Failure Mode Consequence of Failure S Causes of Failure O Prevention D RPN Recommendations Responsibility
On/Off Switch Soldering Becomes Loose Microphone will not turn on 7 Bad soldering 2 N/A 2 28 Check soldering before assembly Controls engineer
Diaphragm Torn Diaphragm Inoperable 7 Misuse or Outside particles gets inside microphone 1 Foam Cover 2 14 None N/A
Extending Stand Grip fails Stand does not stay extended 5 Wear from lots of use 1 Exploded end 1 5 Add rubber stoppers or grips Design Engineer
Microphone Clip Loose Joint Unable to orient to desired location 4 Loose Screws, wear from use 6 N/A 1 24 Tighten Screws constantly, add friction to joint Controls Engineer


Design for Environment

-Luo Image:dfe-toxic.jpg

Conclusion and Recommendations

Retrieved from "http://wiki.ece.cmu.edu/ddl/index.php/Microphone"
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