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Posted (edited)

When I saw the link to Badass LEGO Guns in the article linked by OP, I thought that the Lancer was built by the book's author Martin Hüdepohl. After reading more carefully, I see now that the builder is actually Plum B. Both are creating some pretty awesome work!

OT Question - one for you Mechanical Engineering grads/students/self-learners - I've mentioned before that mechanics sends my code-oriented mind into a tailspin. While watching the video, this gun's mechanics reminded me of something that's been on my mind... using rubber bands scares me! *oh2* What is the most common real-world counterpart for functions in LEGO-world you see people using rubber bands? I know the right answer to this question is "it depends" but that answer doesn't help :tongue: Would you think springs? Is it viable to take shocks apart and only use the spring to replace rubber band usage for some things? Any existing examples of this out there?

Cheers ~ Perry

Edited by PerryMakes
Posted

When I saw the link to Badass LEGO Guns in the article linked by OP, I thought that the Lancer was built by the book's author Martin Hüdepohl. After reading more carefully, I see now that the builder is actually Plum B. Both are creating some pretty awesome work!

OT Question - one for you Mechanical Engineering grads/students/self-learners - I've mentioned before that mechanics sends my code-oriented mind into a tailspin. While watching the video, this gun's mechanics reminded me of something that's been on my mind... using rubber bands scares me! *oh2* What is the most common real-world counterpart for functions in LEGO-world you see people using rubber bands? I know the right answer to this question is "it depends" but that answer doesn't help :tongue: Would you think springs? Is it viable to take shocks apart and only use the spring to replace rubber band usage for some things? Any existing examples of this out there?

Cheers ~ Perry

When you compress or stretch a spring, you're storing energy. A rubber band under tension can store a lot more energy than a Lego shock absorber spring.

The casing around a shock spring, apart from constraining the direction of travel, is there to stop the relatively fragile, thin metal of the springs from deforming beyond the point where they can recover.

You could possible store compressed air using the pneumatics somehow, and release it quickly, but again you're probably limited by the weakness of Lego components. The cylinders are likely to leak before you can store anything like the pressure needed to do work similar to a rubber band.

Posted

very nice mechanisms. I like how you showed them in the video! How did you come up with the mechanisms?

tim

The build isn't mine, I just found the article. Sorry.

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