Mechanical Engineering Technology

1
Mechanical Engineering Technology

• Brandon Smith
• Augustine Trujillo
• Brian Gerow
• Tony Guerrero
• Automatic Goat Feeder

2
Overview

• Background
• Problem Definition
• Task Specifications
• Design
• Fabrication
• Electronics
• Analysis
• Test
• Conclusion

3
Background

• History with the Pueblo Zoo
• Desire to aid animals
• Bacteria outbreak in a Florida Zoos Goat Exhibit

4
Problem Definition

• The task at hand is to create a coin operated,
  feed dispensing unit with animation such that zoo
  pedestrians may enjoy future interactions with
  the goat livestock without direct contact. The
  animation may be in the form of a short visual
  display, requiring minimal power, which will be
  activated by the drop of a coin. At the
  completion of the animation sequence the food
  must be dispensed at one of at least two
  locations. The entire unit must be seen, yet
  weather proof

5
Primary Task Specifications

• Safe for Livestock and Spectators
• Dynamic enclosure 3x3x2
• Dynamic enclosure weatherproof
• 2 feeding locations
• Variable food dispensing

6
Primary Task Specifications (cont.)

• Visible operating mechanism during process
• Feeding cycle to be less than 45 seconds
• Repeatable for 30 cycles
• Power requirements not to exceed 110 V
• Coin operated

7
Secondary Task Specifications

• Low maintenance and inspection requirements
• Lifespan expectancy greater than a year
• Not a permanent installation

8
Design Fabrication
9
Design AREAS OF CONCERN

• Enclosure
• Coin Mechanism
• Motor Mount
• Feed Bin
• Track

10
Design ENCLOSURE

• Design consideration - meet the task
  specification of size for the enclosure of
  3x3x2
• Enclosure designed to be 3 Wide X 3 Tall X 2
  Deep
• Enclosure designed for 16 gage sheet metal.

11
DesignCOIN MECHANISM

• Design consideration - Meet task specification of
  coin operation with visible operating mechanisms
• Coin Mechanism designed to give veiw of top ball
  feed gear.

12
Design GEAR BOX

• BOM of Coin Gear Box assembly

13
DesignMOTOR MOUNT FEED BIN
Design consideration - Meet task specification
of variable feed dispensing locations. Designed
to dispense food to two locations
14
DesignMOTOR MOUNT FEED BINEVALUATIONS
15
DesignFEED GEAR

• Feed gear designed for a volume 1.5 in3 thru hole
  for feed.

16
DesignFEED GEAR FEED BIN
Feed gear located between two separate plastic
bushings. Top bushing single holed to allow feed
to fall from bin into gear hole with lower
bushing two holed over feed outlets.
17
DesignFEED BIN DIMENSIONS
18
DesignTRACK
Track fabricated from 1.5 in OD Clear acrylic
tubing.
19
DesignPLUNGER
Plunger modified from pinball machine
plunger. Barrel and plate redesigned and spring
selected for our required spring constant.
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24

• Electronics

25
Electronics

• PIC 16F819 microcontroller to control the lights
  and sound
• PIC programmed using assembly language
• Microswitches to send signals to PIC
• Lights used were regular and diode type christmas
  lights
• Power Supply 13.8 VDC 3-Amp
• PIC powered by 5 V through 5V regulator

26
Randomness of Feeder

• The randomness is accomplished through the
  programming of the PIC Microcontroller
• 11001010 is loaded into a register on the PIC
• Each time the ball cycles the sequence of 1s and
  0s moves one digit to the left
• The motor moves right for a 1 and left for a 0

27
Problem while testing electronics

• Motor shutting off too soon
• Motor leads can not go around any other components

28
Solution

• Isolate motor from metal case using rubber
  shielding
• Run motor leads in front of sign

29
Analysis Overview

• Spring force
• Slip vs tip
• Track
• Electrical components

30
Analysis of Spring Force

• Needed a K of at least 3 lbs/in
• This spring has a K of over 9 lbs/in

31
Analysis of Slip vs. Tip
32
Analysis of the Track

• Minimum dispense angle of 23 degrees between
  tubing and the feed
• Minimum rolling angle of 5 degrees between
  pinball and tubing

33
Test

• All primary task specifications have been met
• Secondary task specifications cant be determined
  until the unit is operational on site

34
Testing of Primary Task Specifications

• Safe for Livestock and Spectators
• Dynamic enclosure 3x3x2
• Dynamic enclosure weatherproof
• 2 feeding locations
• Variable food dispensing

35
Testing of Primary Task Specifications (cont.)

• Visible operating mechanism during process
• Feeding cycle to be less than 45 seconds
• Repeatable for 30 cycles
• Power requirements not to exceed 110 V
• Coin operated

36
Secondary Task Specifications

• Low maintenance and inspection requirements
• Lifespan expectancy greater than a year
• Not a permanent installation

37
Finally
38
(No Transcript)
39
(No Transcript)
40
(No Transcript)
41
Conclusion

• All primary task specifications have been met
• Well over 500 man hours put into the project
• Out of pocket expenses did not exceed 300
• This will be a successful installment for the
  Pueblo Zoo

42
Thank You