Catapult Trigger: Creative Ideas for Pulling String

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SUMMARY

The discussion centers on innovative ideas for creating a catapult trigger mechanism. Key suggestions include using a dog trained to fetch to pull a string attached to the catapult, and employing a spur gear system powered by a 4.5V DC motor for automated launching. Alternative methods discussed involve simple mechanical solutions like board clips or clothespins for manual triggering, and the use of pulleys or reels for more elegant designs. The conversation emphasizes the need for compact, cost-effective materials that can be sourced easily for school projects.

PREREQUISITES
  • Understanding of basic mechanical principles
  • Familiarity with DC motors and gear systems
  • Knowledge of simple machines like pulleys and levers
  • Basic skills in DIY project assembly
NEXT STEPS
  • Research how to design and implement a spur gear system for mechanical triggers
  • Learn about the use of DC motors in DIY projects
  • Explore various pulley systems and their applications in launching mechanisms
  • Investigate the use of electromagnets in mechanical devices
USEFUL FOR

This discussion is beneficial for students, hobbyists, and educators involved in DIY projects, particularly those focused on mechanical engineering or physics experiments related to catapults and launching mechanisms.

Coco12
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Does anyone have any cool ideas for a catapult trigger. I plan to have a hook attached to bottom of cup that holds the ball and 2 hooks on the base that when you pull the catapult all the way down and put a nail through all three hooks. There will be a string attached to the nail but I need something that would pull the string and the nail along with it.
 
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Step 1 (optional) Get a dog
Step 2: Train your dog to do fetch command
Step 3: Attach the string to the dog's tail and do the fetch command
And... that's how you do remote controller.
 
A slot-car motor could wind the string around a pulley or shaft.
 
A trigger complicates thing a bit too much as far as a catapult is concerned...
But even so, here is something I had thought of doing:
(With a trebuchet - 5th grade sci. project...never completed the trigger part)
A Large spur gear fixed to the 'projecting shaft' synced to another gear (a spur gear cut to get 120 deg section) attached to a (4.5V I think) DC motor controlled by a switch.
The motor gets the shaft down- switch off- Lock and load- Switch on again- as the gears lose contact the projectile launches-gears regain contact- cycle continues.
But I never tried it out...no spur gears of the required sizes and cutting up beyblade rip-cords wasn't exactly working out...project was due soon too...
 
The trigger must be small in size can't be too big, and must be made with materials from home( easy to get and doesn't cost much)
 
For example anything I could do with magnets?
 
Coco12 said:
For example anything I could do with magnets?

Permanent magnets won't help but electromagnets might but a mechanical solution is the best IMO.
How much automation do you want? If you are okay with manually dragging down the shaft and just are looking for a trigger you could just use things like board clips/clothespin and a piece of string for a simple solution. Or if you are looking for something more elegant you could use a string and pulley (a bobbin or a reel would do nicely) attached to a handle which can spun to bring the shaft down and released to fire.
 
Coco12 said:
Does anyone have any cool ideas for a catapult trigger. I plan to have a hook attached to bottom of cup that holds the ball and 2 hooks on the base that when you pull the catapult all the way down and put a nail through all three hooks. There will be a string attached to the nail but I need something that would pull the string and the nail along with it.

Since this is likely a schoolwork project, I will move the thread to the Homework Help forums, and only give a visual hint...

http://www.doorware.com/images/products/deltana-mortise-bolt.jpg
deltana-mortise-bolt.jpg
 

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