SAND SAMPLING APPARATUS

Eglin Air Force BaseGina TeofilakRichard KlimasDan MortensenRuben De Sousa

Overview

2

Introduction

Current Design

Maintenance and Safety

Design Specifications

Motion Control

Motion Control Components

Obstacles

Cost Analysis

Future Plans

IntroductionIN

TROD

UCTIO

N

3

Fractured sand

Projectile

Target shot line

EGLIN

VISIT 10/31/2008Experimental Changes

Newly added forklift straddles

4

CURREN

T DESIG

NCurrent 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

X

y

z

5

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

CURREN

T DESIG

N

6

Future Considerations for X Axis

7

Instead of wheels, an eight foot long steel rod is considered with linear bearings

Steel rod will make it safer for installation than wheel basePrevents tipping when installing onto experiment

Wheels might tip

Steel rod is cheaper

Maintenance and SafetyMaterial are corrosive resistant

Threaded rod is hardened stainless steelWill not corrode based on interaction with other materials used

Experiment is only ran one time a monthWhen not used it will be stored in indoor atmosphere

To keep sand out of moving parts:Bearings with brush guards will usedPlastic accordion style rod boots will cover the lead screwsPlastic guards will be mounted to keep sand out of x- actuator tracks

Lubrication is not requiredBearings are shielded ACME lead screw does not require lubrication

Safety:Chain guard Safety stickers

By all moving parts and electrical components8

Size:Length

96”Width

27”Height

24” Weight:

Mechanism 70 lbs.Vacuum

20 lbs.Electronics 5 lbs.

Vacuum Power: 6.5 Hp peakVolume: 20 gallons(supplied by Eglin)

Mechanism Speed:2 in/sec

Design Specifications

Motion Control Motion control

3 DC motors/ controllers microprocessor encoders/ switches

Y axis motion threaded rodaluminum rods for support

Z axis motionthreaded rodvacuum tube rigidly attached

Control Sequence z axis ½”-1” y axis 24” x axis 4”

X

y

z

10

11

Wall Socket Power Supply Microprocessor

Motor Controller

Encoder

Switches

Encoder Motor

Motor Controller

Motor Controller

Motor

Motor

X Direction Movement

Z Direction Movement

Y Direction Movement

Required Torque Needed (oz*in)

X movement 20

Y movement 40

Z movement 20

Control System SchematicDC Power supplyMicroprocessor stores codeMotor ControllersDistances componentsMotors

Geared motorsRequired Torque

Motion Control Schematic

12

Switches

Encoders

Encoder

Motion Control Components

Why use different distance components? Encoders

Convert rotations of shaft to codePrecise measurement of distanceCan be used to input exact position

SwitchesSimple short circuit switchesEasier to programCheaper

13

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

14

Cost Analysis

Raw MaterialsParts

Purchased Control System

Wheels Option

Rod Option0.00

50.00100.00

150.00

200.00

250.00

300.00

350.00

400.00

450.00

500.00

550.00Cost(USD)

Cost Comparison for X-axis Options

Wheels Option

Rod Option

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

Shipping

Machine Shop

Testing Facilities

Possible testing table

Current design is more expensive than using the rod

Material Cost

Donations

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

COST REFERENCES

Carbon Stick tape http://www.2spi.com/catalog/spec_prep/cond_adhes-discs.shtml

Aluminum Extrusion Dynatech Associates

McMASTER-CARR http://www.mcmaster.com/

REFERENCES1. Cooper, William “Bill”, MSgt Wes Schuler, AFRL/RW

Munitions DirectorateAir Force Research Laboratory

2. Mortensen, Charles, Owner, Dynatech Associates

3. Dr. Chiang Shih, FAMU-FSU College of Engineering, Mechanical

4. Dr. Daudi Waryoba, FAMU-FSU College of Engineering, Mechanical

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Questions?