Water gun
From DDL Wiki
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== Failure Modes & Effects Analysis (FMEA)== | == Failure Modes & Effects Analysis (FMEA)== | ||
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+ | {| class="wikitable" border="1" | ||
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+ | ! '''Item/System !! Failure Mode !! Effects of Failure !! Causes of Failure !! Design Changes !! User Remedies !! S !! O !! D !! RPN | ||
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+ | |- align="center" valign="center" | ||
+ | | Motor/Circuit | ||
+ | | Short Circuit | ||
+ | | Inoperation (no motor), overheating, battery damage | ||
+ | | Crossed wires/loose contacts | ||
+ | | Limit wire movement during use, provide positive wire routing fixtures | ||
+ | | Depending on damage, fix wiring or dispose of gun | ||
+ | | 8 || 2 || 3 || 48 | ||
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+ | |} | ||
== Design for Environment (DFE)== | == Design for Environment (DFE)== | ||
==Team Roles== | ==Team Roles== |
Revision as of 16:59, 5 February 2011
Contents |
Executive Summary
Summer is great time to be outside and toymakers make ir fun for kids to engage in outdoor activities that allow kids to be active and cooldown simultaneously. Waterguns come in different shapes, sizes and with different firing mechanisms from watergun helmets to the super soaker product line. We were intrigued by the idea of a child friendly version of paintball and did a product comparison of the Banzai Color Stream Blaster and the Saturator Ak-47 which utilizes a motor for power.
Bill of Materials
Main Components
Additional Parts
Assembly
Stakeholders
The primary stakeholders for the product are the user, the consumer, retailer, manufacturer, and shipping/transportation of the product.
Consumer
With relation to the Saturator water gun, there are two major consumers: adult (i.e parents) and the users -children and young adults. The needs and requirements of these two consumers are drastically different as shown below.
Buyer (Adults): Consumers are adults including young adults but our primary consumers are parents. Parents of the user will monitor the use of the product and their concerns will mainly be with safety. The needs of the adults are listed below:
- Low cost
- Safe
- Easy for child to use & store
- Durable
- Long product lifespan
- Non-threatening
- Non-toxic
User (Children): The users of the product are children and this categorey also include and are not limited to children over the age of 16. For the primary user the product needs are:
- Visually attractive
- Fun to play with
- Long range of shooting
- Quick & easy to refill
- Accurate & precise shooting
- Lightweight
- Easy to operate
Retailer
Retailers: Retailers are also stakeholders of the product. Their needs are as follows:
- Satisfying to customer
- Easy to shelve and store
- Easy to sell
- Durable
Manufacturer
Manufacturers: Manufacturers as stakeholders of the product have needs including but not limited to:
- Few parts & materials
- Minimize manufacturing processes
- Efficient assemble process
- Low cost production
- Standard parts across a range of models
Shipping/Transport
- Easy to stack
- Small & lightweight product
- Durable
Usage
How It's Used
When initially removed from the packaging, the Saturator requires 4 AA batteries for operation (batteries not included). The batteries are inserted through the butt of the water gun. After battery insertion, the Saturator needs to be filled with water before it can be used. This process is described in the image below.
User Studies
Investigative processes include testing of two types of water guns, the Saturator Ak-47 and the Banzai Color Stream Blaster Water Gun. through experimentation we could determine the performance level of both guns.
Saturator Ak-47: Overall, the Saturator AK-47 Water Gun performs at the average standard for toy water guns. While the water container or clip stays in place, the gun needs to be refilled very often during play. Another negative aspect of this product is the range of shooting. Although it is advertised as a gun that can shoot over 25 feet, the stream of water barely makes it a distance of 15 feet.
Banzai Color Stream Blaster: The Banzai Color Stream Blaster is a pressurized gun. In our test we noticed that the product was quite messy. The Color Stream Blast pump system was futile after about 10 pumps, which was necessary for maximum performance. Althought the product manual explains that all that is needed for the water gun to shoot a continuous stream at a maximum distance of 30 feet was 3-4 pumps. In our studies we found that it took 8-10 almost triple the amount documented to get a continuous stream that reached a maximum distance of 20 feet. After testing the gun there was a puddle of water from the container that leaked during the testing. Pumping the water everytime we wanted a shot proved to be tiring.
Comparison: The Saturator is the easiest to use and least messy which was more prefferred in our user study.
Mechanical Analysis
Design for Manufacture & Assembly (DFMA)
Failure Modes & Effects Analysis (FMEA)
Item/System | Failure Mode | Effects of Failure | Causes of Failure | Design Changes | User Remedies | S | O | D | RPN |
---|---|---|---|---|---|---|---|---|---|
Motor/Circuit | Short Circuit | Inoperation (no motor), overheating, battery damage | Crossed wires/loose contacts | Limit wire movement during use, provide positive wire routing fixtures | Depending on damage, fix wiring or dispose of gun | 8 | 2 | 3 | 48 |