Team Harpoon- Rye Eng101 MW 10:30- Me Motor Magnetic Harpoon(Kevin, Nick, Nathan, Dylan)

Update 9/29 (Final)

Introduction:

In the end we finally settled on a crane. It is much easier to do than a projectile with the knowledge and resources we have and did not require a gear box like the fishing pool idea. 

Dropped a random refrigerator magnet? Don’t bend over and pick it up! That’s for the unscientific, the uneducated, and the weak! Pick it up with your magnetic crane! Dropped an important screw from your PC and some random stranger is trying to pick it up before you? Get there first with the magnetic crane!

http://www.youtube.com/watch?v=3BkSp1w6tTI

Specifications:

Goals:

  • pick up items ~50 g
  • Do so in a reasonable amount of time(5 seconds up and 5 seconds down)
  • be able to reverse directions quickly(with proper setup 2-3 seconds)

Materials:

  • 4″ x 6″ x 1″ wood block
  • 1/8″ copper tube
  • foam
  • 5 lb fishing line
  • 2x 5400 RPM motors
  • 2x Rubber bands
  • 2x hex nut
  • Wire
  • 4x Screws
  • 2x Paper clips
  • Battery connector
  • Electrical tape
  • 9v Battery

Tools: 

  • Inkscape
  • Foam CNC
  • Soldering Iron
  • Box Cutter
  • Hot glue(a Godsend)
  • Wire cutters, pipe cutters

Directions:

  1. Use the CNC to cut out the foam walls
  2. Place the motors in the slots and super glue them together
  3. Break a hole through the spindle and place the copper tube through it
  4. Put the spindle in-between the foam walls and then the rubber bands on the spindle
  5. Glue the foam walls together
  6. Glue the hex nuts on the ends of the motor heads
  7. Glue the fishing line onto the spindle.
  8. To work on the switch: first get the foam board
  9. Get the battery connector and tape it down.
  10. Screw 2 screws into the foam board along with the connectors of the battery connector
  11. Attach 2 paper clips and angle one from the top
  12. Place two screws on the other side
  13. Hot glue the screws in if necessary
  14. Glue the switch to the back of the foam product
  15. Glue on the wood block(gives stability)
  16. Cut groves on the wood block to follow the path of the string

Technical Information

  •  We first tried to glue the motor heads, but it wasn’t enough so we decided to add the hex nuts
  • There is a huge excess amounts of glue, we are pretty awful at applying hot glue
  • The string still isn’t the most accurate
  • We should have used a gearbox, because the torque is too low for most things to pickup.
  • The switch didn’t work, so instead we made our own.
  • The wires are not soldered onto the motors, can cause potential problems
  • The housing for the battery is pretty awful, needs improvement.
  • It did go quite a ways from our original design.
 

How strong is the magnet? xxxx units?

The magnets do not have to be strong, the stronger the magnets the better it will have to grab various tools. Consequently, however, having stronger magnets also means major limitations in design. If you drop a screw in your computer case, then the hook cannot be used due to the magnetized strength and the use of magnets throughout the computer. The magnets will be standard ceramic non-rare magnets

 
 
Kevin- Original Design
Nick- New design
Nathan- Various improvements to design during building stage
Dylan- Improved electrical design.
 
____________________________________________________

 

Update: 9-23

New Design: Magnetic fishing pole

New Specs

Introduction:

The new concept is a magnetic extending fishing pool. It serves a similar purpose, except that the distance is not as long as a harpoon. It makes construction easier, budgeting will be easier, and designing a pull-back system would be a lot easier as well. It takes a more realistic approach with what materials we have.

 

 

Specifications:

Materials:

  • 2x 9v batteries
  • Tape (Optional Battery cases)
  • Wire 
  • 2x Wide rubber bands
  • Acrylic Case
  • Magnets( neodymium are very strong and make hitting the target easier)
  • 2 DC motors
  •  1/4 inch dowel rod
  • 1/2 inch dowel rod  (1.5 Feet)
  • Thead Spindle
  • straw
  • 5 LB fishing line
  • Switch(Paperclip and Screw if constraint financially or too lazy to go buy one)
Tools:
  • Drill
  • Inkscape
  • Nuts/Bolts(If wood route)
  • Strong tape(For example Gorilla or packaging)
  • Wire Cutters
  • Pliers
  • Soldering Iron(not necessary, but makes life easy)
  • Ruler, Calipers or Scale
  • Sand paper
Rye’s questions

Is your harpoon a projectile or a crane?

It is more of a crane now, but was more like a projectile in the early development stage.

How fast does it descend or project? m/s, mph??

Ideally, the faster it descends the better, but realistically ~ 1/4 meter /second would be excellent due to the length of the rod extension
How much weight does it pick up?

Ideally, the more weight the better. But, the target is at smaller tools such as screws and magnetized magnets. Anything ~50 grams would do.
How strong is the magnet? xxxx units?

The magnets do not have to be strong, the stronger the magnets the better it will have to grab various tools. Consequently, however, having stronger magnets also means major limitations in design. If you drop a screw in your computer case, then the hook cannot be used due to the magnetized strength and the use of magnets throughout the computer. The magnets will be standard ceramic non-rare magnets

Specs:

Rod extension – 1.5 feet

2x 9v Batteries

2 Small non brushed DC motors ~800 rpm

Speed of extension and compression: 1/4 meter/ second

15gauge rated wire

5 lb rated fishing line

6″ x 6″ x6″ acrylic box holder.

 

_____________________________

9/21(Old)

Introduction:

The task was t o bring together a “fun something” utilizing 8 1.5 batteries and 2 motors. Any other materials can be used alongside those core materials.

The project is what I like to call the magnetic harpoon. Think of a baseball pitching machine. Now instead of a baseball, its an harpoon-like magnet, used to pick up anything that is magnetized.  Dropped a random refrigerator magnet? Don’t bend over and pick it up! That’s for the unscientific, the uneducated, and the weak! Shoot at it with your magnetic harpoon! Dropped an important screw from your PC and some random stranger is trying to pick it up before you? Get there first with a magnetic harpoon!

[Video input]

 

A (quick) sketch of the top-bottom conveyor, left-right conveyor, and general concept.

 

Team Members:

Nick- Head Builder

Kevin- Documentation and Design

Nathan -Project Manager

Dylan – Research

Specifications:

Materials:

  • 2x 9v batteries
  • Tape (Optional Battery cases)
  • Wire 
  • 2x Wide rubber bands
  • Acrylic Rod (Possible subsitution: Foam or Balsa wood, must be LIGHT)
  • Magnets( neodymium are very strong and make hitting the target easier)
  • 4x Foam pannels( Possible subsituion: wood or plastic)
  • 2 DC motors
  • 2x wood blocks
  • 2x dowel rods
  • String
  • Switch(Paperclip and Screw if constraint financially or too lazy to go buy one)
Tools:
  • Foam Cutter(Optional: CNC, X-acto, knife, saw)
  • Drill
  • Nuts/Bolts(If wood route)
  • Strong tape(For example Gorilla or packaging)
  • Wire Cutters
  • Pliers
  • Soldering Iron(not necessary, but makes life easy)
  • Ruler, Calipers or Scale
  • Sand paper
  • Lubrication(If the rod does not slide, it is game over)

Directions

NOTES: 

  • Attach can refer to any method stated above such as tape, nails, glue, or nuts/bolts
  • Flush refers to being “even” with another object
  • This design is subject to change; materials we used will be posted later on.
  1. Take the 3 panels and attach them in an incomplete box.
  2. Place the motor near the back
  3. Cut out the wood blocks so it is flush with the body of the motor. ONE OF THE MOTOR ENDS SHOULD BE VERY SLIGHTLY STICKING OUT
  4. Attach small dowel rods to the blocks so that the block+dowel rod is flush with the entire motor(The best method is to drill a hole close in diameter to the dowel rod and then gluing it in). 
  5. When everything is firmly attached, get the rubber bands and attach to the motor and dowel rod. 
  6. Drill some holes into both sides of the panels to allow wiring to the outer shell
  7. Wire the motors to one of the sides and attach to battery pack
  8. Utilize a switch if desired(recommended!)
  9. After figuring out what material to make the harpoon out of, craft it and add magnets to the end. 
  10. On the end of the harpoon, tie a string to it. Attach the other side of the string to the motor end that is slightly sticking out(See part 3)
  11. Add the last panel to the boxlike harpoon gun and test
  12. Revamp after testing; go back to the drawing board

Technical Information

  • Reversing the motor other than rewiring the entire battery pack is necessary, WILL NEED TO RESEARCH
  • Not sure if going to utilize a left-right conveyor belt or a top-bottom conveyor belt style.
  • The project can be very cheap, it depends on the materials
  • Wiring is simple, just wire from the motors to the battery pack, OR you can have two battery packs on both outer sides and wire with 4 batteries each. VOLTAGE STAYS THE SAME IF THE CIRCUIT IS IN PARALLEL
  • Due to the nature of moving parts and multiple pieces, accuracy is of the utmost importance, failure is quite likely for inexperienced builders.
01
ryekennedy
September 23rd, 2013 9:31 am

Dear Harpooners,
Is your harpoon a projectile or a crane?
How fast does it descend or project? m/s, mph??
How much weight does it pick up?
How strong is the magnet? xxxx units?

I’m looking for measurable specifications of your project.

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