Microphone
From DDL Wiki
| header 1 | header 2 | header 3 |
|---|---|---|
| Row header 1 | cell 1,1 | cell 1,2 |
| Row header 2 | cell 2,1 | cell 2,2 |
| Part Number | Photo | Part name | weight (g) | notes |
|---|---|---|---|---|
| 1 | Ring | 2 | attaches to mic end of boom shaft | |
| 2 | Boom shaft | 493 | ||
| 3 | Counterwieght | |||
| 4 | Mic holder | 10 | ||
| 5 | Bolt A | 3 | holds mic holder to #7 | |
| 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 place | |
| 10 | Bolt C | 16 | holds #8, #9, and #10 together | |
| 11 | Boom holder | 65 | has a long hole in which the boom is inserted. Attaches to mic stand
via #8 | |
| 12 | Washer | #10 goes throught this washer | ||
| 13 | Ring | 2 | Identical to #1 | |
| 14 | Handle | Has a threaded hole in which the end of #10 is inserted | ||
| 15 | Thumbscrew | 3 | Holds boom in place. Goeas through hole in #11. Has plastic nub so as
not to scratch the boom | |
| 16 | Wire clip | 2 | Attaches to mic stand, used to hold wire in place |
| Part Number | Photo | Part name | Weight (g) | Notes |
|---|---|---|---|---|
| M1 | cell 1,1 | cell 1,2 | ||
| M2 | cell 2,1 | cell 2,2 | ||
| M3 | cell 2,1 | cell 2,2 | ||
| M4 | cell 2,1 | cell 2,2 | ||
| M5 | cell 2,1 | cell 2,2 | ||
| M6 | cell 2,1 | cell 2,2 | ||
| M7 | cell 2,1 | cell 2,2 | ||
| M8 | cell 2,1 | cell 2,2 | ||
| M9 | cell 2,1 | cell 2,2 | ||
| M10
|
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. The table below shows the primary ways in which the leaf blower studied for this report could potentially fail as well as the probable consequences, severity, causes, likelihood of occurrence, design safeguards, detectability of failure, recommendations for improvement and responsibility for making changes. The values assigned for severity, likelihood of occurrence and detectability (S, O, and D respectively) are based on the tables found in Dieter and Schmidt's 'Engineering Design'. The risk priority number (RPN) is simply the product of these numbers and can be used to assign a priority to potential failures in order to organize the redesign process.
| Assembly/Parts | Failure Mode | Consequence of Failure | S | Causes of Failure | O | Safeguards | D | RPN | Recommendations | Responsibility |
|---|---|---|---|---|---|---|---|---|---|---|
| Electric Motor and Wiring | Blown Fuse | Inoperable | 7 | Short circuit | 3 | Coated wire | 4 | 84 | None | N/A |
| Electric Motor and Wiring | On/Off Switch Broken (Plastic fracture prevents operation) | Inoperable | 7 | Broken mechanism due to fatigue or misuse | 4 | Sliding design does not experience substantial fatigue | 4 | 112 | None | N/A |
| Electric Motor and Wiring | Power cord worn | Potential shock hazard, may be inoperable | 8 | Cord worn by frequent twisting and bending | 5 | Flexible cord coating, longer cord is more flexible, wires also coated independently of cord | 2 | 80 | Plug directly into case with no wire; use wireless power source | Design Engineer |
| Electric Motor and Wiring | Contactor corroded | May become inoperable | 5 | Exposure to water | 4 | Motor housing, plastic insulators for wires | 8 | 160 | None | N/A |
| Electric Motor and Wiring | Interlock activator spring corroded | May become inoperable | 5 | Exposure to water | 3 | Enclosed in motor housing | 8 | 120 | None | N/A |
| Fan and Mulcher | Fan jammed | Fan stops, motor may overheat | 3 | Heavy or thick objects in fan/mulcher | 6 | Blade guard for blowing, mulcher blades for use with vacuum | 3 | 54 | None | N/A |
| Fan and Mulcher | Broken blade | Decreased mulching efficiency | 2 | Rocks or other hard objects in mulcher | 4 | Strong mulcher blades, blade guard | 7 | 56 | None | N/A |
| Fan and Mulcher | Loose blade | Decreased air flow | 4 | Nut loosened by spinning and vibration | 2 | Left handed nut | 5 | 40 | None | N/A |
| Blower and Vacuum Attachments | Blower chute locking tab broken | Unable to secure blower chute and vacuum bag, cannot use as blower or collect vacuum debris easily | 5 | Fatigue stress | 4 | Design for repeated loading | 1 | 20 | Consider different locking mechanism | Design Engineer |
| Motor Housing | Cracked motor housing | Vibration and difficulty in use | 3 | Misuse (e.g. dropped) | 5 | Design for strength | 3 | 45 | Consider padding areas likely to experience impact | Design Engineer |
| Blower and Vacuum Attachments | Torn Leaf collection bag | Unable to collect leaves | 4 | Excessive or improper use | 5 | Bag fabric is tear resistant | 3 | 60 | None | N/A |
| Blower and Vacuum Attachments | Air concentrator locking tab broken | Unable to use air concentrator | 3 | Overuse leading to fatigue failure | 5 | None | 2 | 30 | Consider different locking mechanism | Design Engineer |
