1 / 34

Pegasus Producer 3D

Pegasus Producer 3D. GROUP 2. Roberto Tang, EE Giovanny Vasquez, EE Hector Arenas, CpE. Goals and Motivation. Industry 3D Printers are used in… Product Development 3D visualization Rapid Prototyping.

prieto
Download Presentation

Pegasus Producer 3D

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pegasus Producer 3D GROUP 2 • Roberto Tang, EE • Giovanny Vasquez, EE • Hector Arenas, CpE

  2. Goals and Motivation • Industry 3D Printers are used in… • Product Development • 3D visualization • Rapid Prototyping • NASA recognized the potential of 3D printers and has spent millions of dollars in research and development to create a 3D printer that works in space • UCF students have recently been in the headlines for creating a cheap yet effective 3D printed prosthetic arm for children • 3D printers are revolutionizing major aspects of our society and allowing for the creation of 3D printed food, homes, cars, organic material, prosthetics, and everyday household goods • The purpose of the Pegasus Producer 3D is to create an affordable 3D printer which can show the limitless creative potential that 3D printing technology can bring

  3. Specifications

  4. Project Block diagram Pegasus Producer 3D Control Board Power Supply Mechanical Software AC Input 120V/60hz G-Code To Motor Movement Interpretation Extruder X/Y/Z Axis DC Output 12V/17A Motor and Heat Control CAD to G-Code Firmware Processing

  5. Creator • FreeCAD • OpenSource • Online Tutorials • Easy export to .OBJ and .STL • Useful for calibration and testing

  6. Translator • Cura • Open Source • Compatibility with .OBJ and .STL • Easily rotated • View by layers • Ability to open multiple files simultaneously • Generates the .gcode file

  7. Calibrator • RepetierHost • Allows manual movements while connected through USB • It shows the temperature of the heatbed and extruder • Shows fan speed and positioning of the extruder head

  8. Gcode • Used to set commands to the printer • The most common ones are movements • Specific set of commands to prepare the printer for initialization and finalization

  9. Power requirements

  10. Power Supply Control Board Buck Controller Transformer Rectifier

  11. Power Supply Control Board Buck Controller Transformer Rectifier Primary: 115V 60Hz Secondary: 12.6V Rated: 252 VA Size: 3.75in L x 4in W

  12. Power Supply Control Board Buck Controller Transformer Rectifier Bridge Rectifier Volt (max): 100V Current (max): 20 amps Rated: 252 VA Primary: 115V 60Hz Secondary: 12.6V Rated: 252 VA Size: 3.75in L x 4in W

  13. Power Supply Control Board Buck Controller Transformer Rectifier Bridge Rectifier Volt (max): 100V 60Hz Current (max): 20 amps Rated: 252 VA Primary: 115V 60Hz Secondary: 12.6V Rated: 252 VA Size: 3.75in L x 4in W TPS40303 Synchronous Buck Input: 3V-20V

  14. Power Supply Control Board Buck Controller Transformer Rectifier Bridge Rectifier Volt (max): 100V 60Hz Current (max): 20 amps Rated: 252 VA Primary: 115V 60Hz Secondary: 12.6V Rated: 252 VA Size: 3.75in L x 4in W TPS40303 Synchronous Buck Input: 3V-20V 12V @ 7A

  15. Power Supply Schematics

  16. Control Board Stepper Motors Motor Control 12V Power Input 12V/5V 5V Microcontroller End Stops 12V ~6A Hot end SD Card Extension Pins USB Interface Temperature Control

  17. Control Board Current Arduino based prototype Control Board Goals for Control Board: Powerful yet cost effective MCU with multiple I/O pins and DIP package Small in size and easy to replicate using discrete components Power regulation to handle an input of 12V and 17 amps On board micro-step control USB interface for printer calibration Microcontroller Choices

  18. Specifications Control Board – MCU Decision Advantages: Atmegag644p • Easy to solder DIP Package • 32 pin I/O for future expandability • Easily Replaceable due to $8 price tag • Very Similar to Popular AVRs such as the Atmega328p and Atmega2560 Downfalls: No “out of the box” third party IDE software support, a bootloader must be installed through in-circuit programming to install 3D printing firmware

  19. Control Board – Overall PCB Schematic

  20. Control Board – Motor Control Motor Driver with A4983 chip

  21. Stepper Motor • Our Motor NEMA17 • 200 steps per revolution; 1.8° per step • 12V rated voltage • 0.9A max current • 20 N*cm torque • Stepper motors are used because of their accuracy due to their discrete steps

  22. Control Board – USB Interface

  23. Control Board – PCB Layout

  24. Thermistor • At the highest point of the resolution the higher the voltage change per temperature change • Using a 100 kΩ thermistor assuming that the room temperature is 25°C • Using look-up tables

  25. State Diagram • Waits for SD card • Flows throughout the different stages • Reports errors to error.txt

  26. Flow Diagram • Configuration information will be static non changing written before the code runs • There is back and forth flow between the reading and interpreting the data

  27. End Stops • Gap between electrical and mechanical functions. • Cheaper and practical to implement over optical sensor. • Essential for X, Y and Z calibrations. • Analog input • Allows to move to origin without recalibrating • 2 pieces of metal, a couple of pull down resistors.

  28. Extruder – Basic Principle Plastic must be fed at a variable speed, Different printing materials require different temperatures Hot end and cold end must have proper insulation to prevent 3D printed cold end from melting Motor vibrations must be kept to a minimum Nozzle size should remain within .35mm and .4mm to maintain adequate printing resolution

  29. Extruder Motor Rotates a Toothed Pinch Wheel to Force Filament through Special Thread to Reduce Motor Vibrations 3D Printed Cold End The Insulator known as A Bowden Tube is stiff enough to pass Plastic and prevent Heat Transfer to Cold End The Brass Hot End has a .4mm Nozzle And can heats up to 250 degrees Celcius Thermistor attached to Hot End to Monitor and Regulate Temperature

  30. Filament Spool of ABS Plastic • Science behind Melting Plastic: • Glass Transition Temperature (Tg)- Temperature when plastic goes from solid to rubbery • Melting Temperature (Tm) – Melting Temperature, plastic becomes a liquid • Temperature between (Tg) and (Tm) is ideal extrusion temperature! • Temperature vs Extrusion Speed • Vmax= k (THotEnd - Tplastic) • Vmax = max velocity of extruder • THotEnd= temperature of hot end • Tplastic= ideal extrusion temperature (between Tg and Tm) • K= nozzle size constant

  31. Chassis • Base moves in X direction • Extruder head moves in Y and Z direction • Two motors in for Z axis movement to ensure stability in the frame • 4000 steps to move Z 1mm, 782 for Y

  32. Budget

  33. Questions?

More Related