Centering Magnet Device P08028 A.Burger J. Lu D. Falcinelli M. Brown

Order of Presentation 1.) Introduction of existing device 2.) Problems with the existing device 3.) Customer's Needs 4.) Break-up device into sub-assemblies 5.) In depth details of sub-assemblies 6.) Different combinations of different sub- assemblies 7.) 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 indicators 3.Rotating the entire assembly and mapping the magnetic field 4.Calculating the max and min of the magnetic field and determine the location of the maximum value 5.Rotating the magnet and bushing assembly to the maximum location 6.Move assembly to the pushing device where it moves the magnet 7.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 gluing This 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