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Open-Aid. TEAM PRATHAM Team Leader: Matt Ryan Chief Engineer: Nick Martin Fabrication: Reed Langton CADCAM: Fraterno Vila Electronics/Control Engineer: Gabriel Letona. Outline. Problem Definition Product Requirements Operation Prototype Design Issues Strengths and Weaknesses

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Open aid

Open-Aid

TEAM PRATHAM

Team Leader: Matt Ryan

Chief Engineer: Nick Martin

Fabrication: Reed Langton

CADCAM: Fraterno Vila

Electronics/Control Engineer: Gabriel Letona

AME470 Ltd. - Team Pratham


Outline

Outline

  • Problem Definition

  • Product Requirements

  • Operation

  • Prototype

  • Design Issues

  • Strengths and Weaknesses

  • Budget Summary

AME470 Ltd. - Team Pratham


Problem definition

Problem Definition

  • Break the seal on jars and bottles without requiring the user to apply the torque necessary to open them

AME470 Ltd. - Team Pratham


Product requirements

Product Requirements

AME470 Ltd. - Team Pratham


Open aid1

Open-Aid

  • Ability to open a glass or plastic container

  • Uses a microprocessor with feedback from sensors to control the driving motors

AME470 Ltd. - Team Pratham


Prototype vs concept

Prototype vs. Concept

  • Housing - Box vs. Cylinder

  • Height Adjustment

  • Fabricated bottom half

AME470 Ltd. - Team Pratham


Operation

Operation

AME470 Ltd. - Team Pratham


Programming opening container

Sense top assembly contact switch

Stop turning top assembly motor

Plug in

appliance

Start turning bottom assembly motor

Has bottom assembly contact switch been pressed?

No

Yes

Press ‘start’

button

Count to 1 second

Hall effect sensor 2 senses magnet

Does Hall effect sensor 1 still sense magnet?

No

Turn top assembly motor on

Yes

Stop bottom assembly

motor and

go to release operation

Stop bottom assembly motor

Programming (Opening Container)

AME470 Ltd. - Team Pratham


Programming releasing container

Reverse top assembly motor

Sense top assembly hall effect sensor

Stop top assembly motor

Reverse bottom assembly motor

Hall effect sensor 1 senses magnet

Stop bottom assembly motor

Programming (Releasing Container)

AME470 Ltd. - Team Pratham


The prototype

The Prototype

AME470 Ltd. - Team Pratham


The prototype1

The Prototype

  • Sensors - Contact switches moved to breadboard

Prototype

Concept

AME470 Ltd. - Team Pratham


Design issues

Design Issues

  • Torque Requirements

  • Motor Selection

  • Plate Design

  • Gripping Components

  • Electronics

AME470 Ltd. - Team Pratham


Torque requirements

Torque Requirements

AME470 Ltd. - Team Pratham


Motor selection

Motor Selection

Motor Selection:

AME470 Ltd. - Team Pratham


Gear train

Gear Train

  • 6:1 gear ratio required to transmit operating torque with the Buehler DC motor

  • Stainless steel clamp hub gears from Berg

  • Clamps secure gear and pinion

AME470 Ltd. - Team Pratham


Plate design

Grip

Plate w/ Linear Grooves

Plate w/ Spiral Grooves

Plate Design

Motor output results in the spinning of the Plate w/ Spiral Grooves, causing the Grip to move towards the center of the plates along the linear groove

Grip rests at intersection of linear and spiral grooves

Linear Groove

Spiral Groove

Convergence Angle

Resulting Force on Grips from Spiral Groove

AME470 Ltd. - Team Pratham


Plate design1

Torque Key

Gears

Motor

Torque Key

Plate Design

  • Torque Key is fastened to the central shaft with a spring pin

  • Torque Key interlocks with Plate w/ Spiral Grooves

AME470 Ltd. - Team Pratham


Gripping components

Gripping Components

  • Concept – three gripping components consisting of a gripping arm riding in a slotted bracket, with a spring and contact switch

  • Inserts into spiral and radial plates

Spiral

Radial

AME470 Ltd. - Team Pratham


Gripping components1

Gripping Components

  • Prototype – single unit with high-friction synthetic polymer pads

  • Problem – prototype slips on glass containers

Radial Plate

Spiral Plate

AME470 Ltd. - Team Pratham


Electronic schematic

Electronic Schematic

AME470 Ltd. - Team Pratham


Microcontroller system and power source

Microcontroller System and Power Source

  • Minimax Microcontroller

    • Microprocessor PIC16F877A

    • Demands 6 to 12V DC

    • 100mA minimum current

    • Provides 5V

  • External Power Source

    • 120V AC from outlet

    • Use of an AC-DC adapter power source converter

AME470 Ltd. - Team Pratham


Sensors

Container to Open

Hall Effect Sensor

Magnet 1

Housing

Lower Plate Assembly

Sensors

  • Magnetic Hall Effect sensors are used to control the rotation of the plates during the opening of the container

AME470 Ltd. - Team Pratham


Sensors1

Contact Switches

Hall Effect Sensor & Magnet

Sensors

AME470 Ltd. - Team Pratham


H bridge

H-Bridge

  • 2 NMIH-0030 H-bridges

  • DC motor applications from 6 to 18 V up to 5 A current

  • Provides forward, reverse, and brake modes of operation.

AME470 Ltd. - Team Pratham


Strengths and weaknesses

Strengths and Weaknesses

AME470 Ltd. - Team Pratham


Budget summary

Budget Summary

  • Most expensive components:

    - Large Gear $43.00

    - H-Bridge $30.00

  • Budget Available:$400.00

  • Total Budget used: $338.00

  • Budget Left: $62.00

AME470 Ltd. - Team Pratham


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