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    Super Glue Gun Build
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    Super Glue Gun

    1.  GETTING STARTED

      • Discuss original idea / episodes (use footage flashbacks)
      • Talk about what we liked / didn’t like
      • Why we believe it’s a good project
      • Map out project goals / major design challenges
      • Design drawing and sketches
      • Decide major parts and begin sourcing:
        • Hot end extruder
        • Extruder motor
        • Power supply
        • Trigger/controls
        • Microcontroller
        • Automatic stand & casing

     

    GOAL: Create product roadmap & design spec

     

    2.  EXTRUDER MOTOR

      • Knowing what the hot end can do and what the PSU can supply, figure out the best way to mechanically move the glue through the device
      • Source gear motors / knobbed extruder heads and work on a variety of 3D printed prototype tests.
      • Find a motor that works within the constraints of the PSU.
      • Isolate DC motor noise from the rest of the circuit. Work on stabilizing voltages.
      • Test glue loading, idle wheel spring, and basically try and break the mechanism.

     

    GOAL: Using a PWM controlled motor, extrude glue through the gun at both low, carefully controlled speeds and high “gushing” temperatures

     

    3.  HOT END EXTRUDER

      • Discuss why we must decide this part first (certainly before PSU)
      • Source and test multiple commodity extruder parts
      • Do safety tests & find best / cheapest method of reliable temperature sensing & control
      • Determine force required to extrude glue through gun and temperature falloffs
      • Talk about solid state current control and PWM techniques
      • Try and break it / burn it up to find the limits of safety

     

    GOAL: Decide on a hot end and know all of its specs and how this will affect the rest of the project

     

    4.  POWER SUPPLY

      • In this episode we figure out the best way to power our Super Glue Gun
      • Decide between cord / battery powered (probably going to be AC cord)
      • Test power supply with all conditions of the previously established Hot End
        • Figure out the cheapest way to provide (and control) high-voltage AC hot end power as well as stable 3.3v / 5v logic voltages
        • Find solutions that will provide the quickest path to UL/FCC certification

     

    GOAL: Select the best switching control for hot end and logic circuits. Breadboard temperature sensor tests with MCU

     

    5.  TRIGGER / CONTROLS

      • Figure out what controls and indicators the device needs and build prototypes
      • Decide best way to get analog trigger input (potentiometer, hall effect, optical)
      • Test the pros and cons of each method (ie, motor EMF could corrupt a hall effect sensor)
      • Controls will influence product case design, so start narrowing down ideas for this and do sketches
      • Begin initial tests / designs for an auto-deploying kickstand

     

    GOAL: Translate analog trigger control to PWM DC motor driver / extruder, and see if capacitive trigger touch is affordable / easy to manufacture.

     

    6.  MICROCONTROLLER

      • Decide what this MCU must do based off our mechanical tests thus far:
        • Temp sensing (be compatible with whatever we attached to hot end)
        • Analog trigger control
        • Capacitive touch sense – built in to save external circuitry?
        • Fewest external parts (crystals, PSU, EEPROM)
      • Source and test multiple MCUs (well before episode films) create pro/con list
      • Request help from vendors / supply side solutions?

     

    GOAL: Select a MCU that is the cheapest possible thing that will support all of the features we’ve tested on the unit thus far (and has good availability / factory programming support)

     

    7.  CASING & AUTOSTAND

      • Try and get an automatic deploy stand to work (controlled by capacitive touch trigger)
      • Decide if this feature is economically feasible
      • Using all previous parts, begin designing enclosures
      • Fusion 360 / software collaboration?

     

    GOAL: 3D print an enclosure that is in the ballpark of something that could be injection molded as a final product.