Sand Sampling Apparatus

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Sand Sampling Apparatus

• Eglin Air Force Base
• Gina Teofilak
• Richard Klimas
• Dan Mortensen
• Ruben De Sousa

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• Overview

• Introduction
• Current Design
• Maintenance and Safety
• Design Specifications
• Motion Control
• Motion Control Components
• Obstacles
• Cost Analysis
• Future Plans

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introduction

• Introduction

Projectile
Fractured sand
Target shot line
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Eglin Visit 10/31/2008

• Experimental Changes

Newly added forklift straddles
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Current Design

• Current Design

• Uses 2 linear motion actuators for Y and Z
  motion
• ¾ inch ACME threaded rod
• Designed to be a lead screw
• Each will have an aluminum extrusion frame
• Y and Z are different sizes
• ¼ inch aluminum rod stabilizers for support
• motion to be attained from 2 DC motors
• Z- actuator is mounted directly to the Y-
  actuator
• Legs of Y- actuator mount to wheels to produce X
  motion

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Current Design

• Motion in the X-direction

• Chain and sprocket motion
• Wheels fit inside aluminum extrusion
  grooves
• DC motor attached to sprocket
• Chain is clamped to actuator
• Clamp has teeth of same pitch as the chain
• Chain mount is adjustable for chain
• tension

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• Future Considerations for X Axis

• Instead of wheels, an eight foot long steel rod
  is considered with linear
• bearings
• Steel rod will make it safer for installation
  than wheel base
• Prevents tipping when installing onto experiment
• Wheels might tip
• Steel rod is cheaper

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• Maintenance and Safety

• Material are corrosive resistant
• Threaded rod is hardened stainless steel
• Will not corrode based on interaction with other
  materials used
• Experiment is only ran one time a month
• When not used it will be stored in indoor
  atmosphere
• To keep sand out of moving parts
• Bearings with brush guards will used
• Plastic accordion style rod boots will cover the
  lead screws
• Plastic guards will be mounted to keep sand out
  of x- actuator tracks
• Lubrication is not required
• Bearings are shielded
• ACME lead screw does not require lubrication
• Safety
• Chain guard
• Safety stickers
• By all moving parts and electrical components

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Design Specifications

• Size
• Length 96
• Width 27
• Height 24
• Weight
• Mechanism 70 lbs.
• Vacuum 20 lbs.
• Electronics 5 lbs.
• Vacuum
• Power 6.5 Hp peak
• Volume 20 gallons
• (supplied by Eglin)
• Mechanism Speed
• 2 in/sec

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Motion Control

• Motion control
• 3 DC motors/ controllers
• microprocessor
• encoders/ switches
• Y axis motion
• threaded rod
• aluminum rods for support
• Z axis motion
• threaded rod
• vacuum tube rigidly attached
• Control Sequence
• z axis ½-1
• y axis 24
• x axis 4

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Motion Control Schematic
Required Torque Needed (ozin) Required Torque Needed (ozin)
X movement 20
Y movement 40
Z movement 20

• Control System Schematic
• DC Power supply
• Microprocessor stores code
• Motor Controllers
• Distances components
• Motors
• Geared motors
• Required Torque

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Motion Control Components

• Why use different distance components?
• Encoders
• Convert rotations of shaft to code
• Precise measurement of distance
• Can be used to input exact position
• Switches
• Simple short circuit switches
• Easier to program
• Cheaper

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Motion Control Obstacles

• Make Screens
• They are a problem
• Break and Deform
• Slightly unequally spaced
• Removed for simplicity
• Suggested from the sponsor

• Projectile Entry Tube
• Adds safety to the experiment
• Cannot be removed
• Mechanism is designed
• to avoid

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Cost Analysis

• Shipping
• Machine Shop
• Testing Facilities
• Possible testing table

Option Total (USD)
Wheels and corrosion res.chain 1387.53
Wheels and non-corrosion res.chain 1347.33
Rods and corrosion res.chain 1281.94
Rods and non-corrosion res.chain 1241.74

• Current design is more expensive than using the
  rod
• Material Cost
• Donations

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Future Plans

• Purchase Parts
• Machine and Assemble
• Write the program
• Test
• Write Procedures
• Make modifications
• Conduct the Experiment
• Meet the Class Deliverables

December 2 January 6
January 6 April 24
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Cost References
REFERENCES

• Cooper, William Bill, MSgt Wes Schuler, AFRL/RW
• Munitions Directorate
• Air Force Research Laboratory
• Mortensen, Charles, Owner, Dynatech Associates
• Dr. Chiang Shih, FAMU-FSU College of Engineering,
  Mechanical
• Dr. Daudi Waryoba, FAMU-FSU College of
  Engineering, Mechanical

Carbon Stick tape http//www.2spi.com/catalog
/spec_prep/cond_adhes-discs.shtml Aluminum
Extrusion Dynatech Associates McMASTER-CARR
http//www.mcmaster.com/
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Questions?