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Centering Magnet DeviceP08028
A.BurgerJ. Lu
D. FalcinelliM. Brown
Order of Presentation
1.) Introduction of existing device2.) Problems with the existing device3.) Customer's Needs4.) Break-up device into sub-assemblies5.) In depth details of sub-assemblies6.) Different combinations of different sub-
assemblies7.) Design concept decided on
Introduction of Existing Device
Step 1.
Bushing and Magnet holding Fixture
Dial Indicators used to measure the magnet and bushing position
A closer look at the positioning process
Magnet mapping sensors and pusher assembly
Hall Effect Sensors
Physical device used to push the magnet
Process of Mapping and Pushing the Magnet
1. Aligning linear stages 2. Determining the position of the bushing and magnet using
the dial indicators3. Rotating the entire assembly and mapping the magnetic
field4. Calculating the max and min of the magnetic field and
determine the location of the maximum value5. Rotating the magnet and bushing assembly to the
maximum location 6. Move assembly to the pushing device where it moves the
magnet7. This process is repeated until the magnetic field and
bushing are concentric to 20 microns
Issues with this process
• Manual process involved• Physically measuring the position of parts• Human error• Indicator being destroyed • Holding magnet and bushing• Pushing the magnet• Moving parts
Customer Need’s
Sub Assemblies
• Assemblies Orientation• Physically holding parts• Measuring parts• Mapping magnetic field• Centering magnet• Adhering magnet to bushing• Confirming and validating
Assembly Orientation
Vertical or horizontal
Holding Fixture: Pugh Chart
Holding Component
• Post • Chuck• Combination of both
Measuring and mapping parts
• Hall effect sensors will measure the magnetic fields, choices to be decides from are: – A single sensor which moves– An array of sensors
• The position of the bushings:– Will not involve a human operator – Will not touch the components
Centering Magnets
• Option 1– Having the entire bushing/magnet assembly move
towards a physical device like the existing device• Option 2– Move a physical device towards the bushing/magnet
assembly• Option 3– A bushing which is stationary and a bushing that moves
• Option 4– A magnet which is stationary and a bushing that moves
Adhering
• Automated gluing • Heat activated composites• UV activated• Ultra sonic• Applying a pressure to the centered assembly
then gluingThis sub assembly will be determined once the
holding and centering of magnet are chosen
Design concept decided on
• The magnet/bushing assembly will be vertical• An array of Hall Effect sensors will be implemented• Option 4: having the magnet stationary while
moving the bushing
Why this configuration
• Vertical eliminates gravity• No gravity eliminates forces • An array eliminates a moving element• The magnetic field be the reference point• Magnet centers change from magnet to
magnet, bushings do not
Different configurations
• Magnet above bushing• Magnet below bushing• Bushing is placed on magnet, manually
Magnet held in place on top
Magnet held in place on bottom