Transcript Initial Design Presentation

EASELECTRIC
Team 4
Adam Frank Jackie Jon
Introduction
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Planning a Design
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General Requirements: An electrically adjustable
easel that can be safely used in a community of
cognitively impaired individuals.
Should be light-weight and movable in 3 planes of
motion and controllable tilt operations (i.e. front to
back, side to side, and up and down)
Overview of Client, Harry Grim
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Moderate Cognitive Impairment (MR)
Limited Arm Movement and Dexterity
Received “Painting Easely” project developed
by UConn students in 2002
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Flaws include:
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Too large and heavy
Safety concerns involving speed of movement
Control settings
Specifications
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Safety Features:
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Automatic mechanism to stop movement of easel
beyond its maximal excursion
Master switch to turn device on/off
Powered by a wall switch
Slow movements so there is sufficient time to control
device due to delayed responsive skills of the artist
No exposed cords or wires
Control Features
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Detachable joysticks to control easel movement
from a wheelchair
Master switch located on the back of the device
Simplistic controls that can be easily
maneuvered by individuals with MR
Size Restrictions
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Requests for Device Dimensions
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Tabletop arrangement with room for Harry’s feet
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From floor to lap, allow approximately 27”
Lightweight
Transportable design making the device easy to store
Canvas Size should be adjustable
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Min: 8” by 8” Max: 30” high by 38” wide
Initial Design
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Materials:
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Require a lightweight, sturdy, and cheap material for
frame
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Wood: Too flimsy, not ideal for electric movement
PVC: Again, too flimsy (used in former project)
Stainless Steel: Heavy, expensive
ALUMINUM
Initial Design
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Aluminum Advantages
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Lightweight
Cheap
Weldable
Sturdy
Available in different shapes, lengths, and forms of
stock
Initial Design
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Aluminum Characteristics
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Alloys- 1000,2000,3000,4000,5000,6000,7000 series
aluminum
Fabrication- bending, drilling, punching, tacking,
welding, tapping
Finishes- mill, anodized, mechanical, painted
Types- extruded, drawn, miniature, welded
Initial Design
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Aluminum Shapes:
Channel
Square Tubing
Angle
Initial Mechanical Design
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Movement driven by up to 4 linear actuators.
Heavy Duty “Drawer-like” tracking for stability
and guidance
Initial Mechanical Design
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Sturdy 2-inch square tubing base
Clamped under table for added stability
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Manually adjustable
Servo-motors
Initial Mechanical Design
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2 part design for movement:
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Base – Responsible for front and back movement
Carriage – Moves forward and back in base and
allows for vertical, horizontal, and tilt motions.
Initial Mechanical Design
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Other ideas for movement include:
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Cam system or pulleys to amplify movement of
actuators
Enclosed screw drive or rack and pinion system
instead of actuators for linear movement
Pneumatic or hydraulic actuators instead of electronic
Initial Mechanical Design
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Different drawing surface attachments
Will separate into 3 “flat” parts for storage:
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Base
Carriage
Drawing Surface
Initial Design – Electrical System
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Client requested the use of
joysticks to control motion
of easel
Design ideas – Hard Wired
vs. Digitally Controlled
Use of Relays to
accommodate low
voltage/current joystick and
higher voltage/current
actuator
Initial Design – Electrical System
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Circuit requires safety mechanisms including:
 Master On/Off Switch
 Fuse or breaker
 Limit Switch to constrain range of motion
 Possibility of attachments such as canvas light
 Method of organizing and concealing wiring etc.
Budget is Most Limiting Factor
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$750.00
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24” Actuator estimates: Around $100 a piece
Sliding Tracks: Around $25 a piece – 3 required
Aluminum/ Steel Stock: most will be provided by
Independent Welding Inc.
Joysticks: $12 a piece (2)
Relays: $40
Summary
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Goal is to create an easel that meets the needs
of our client and is less expensive than current
products.
Mechanically we are looking for a safe and
simple design.
Materials need to be strong and lightweight.
Electronics need to be simple yet able to
properly control the device.
References
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http://www.argylein.com/cgibin/search_dies.pl?words=EQUALANGLE
Mouser Electronics Catalog 2005