His Lego domino row building machine is pretty neat too. It does its job pretty well, with only a few Lego blocks used. http://woodgears.ca/domino/index.html
I don't do any woodworking but love to watch his videos.
Inspiring guy. He seems to make his money from selling his woodgears software program, plans for some of his woodworking projects and from Google for being a Youtube partner.
mattias' approach has really influenced how i think about software engineering. not entirely surprising considering he is also a software engineer. i think his youtube channel is really worth checking out. he has even invented several new, amazing tools, like the "pantorouter" for cutting perfect mortise and tennons (among other things) with a router. https://www.youtube.com/watch?v=8wZ1v4PIsYI
the way he solves, and even identifies, the problems in the woodworking domain are, i think, very instructive for how to think about some aspects of software design.
My 15 year old brother made one of these a couple of years ago. He saw a video that demoed it with the plans available for $5 but he looked at the video and went and made it from mind.
It was so powerful, almost hilariously so!
He actually said on Facebook earlier: "I made one of these before it was cool."
For this purpose, isn't it force, not mass, that matters?
F = mv^2, so the velocity of bullet is a very large factor, especially when the terminal ballistics allow for most or all of the energy to be dumped into the target.
And the history of cartridges, the ability to "reload", make your own custom load, and the ability to stand off to let air resistance bleed off velocity, means you'd likely be able to apply the exact amount of energy you'd want.
Yeah, I'm thinking of energy, but in this case I'm assuming the terminal ballistics will dump all the bullet's energy into the block that's hit (that it won't penetrate all the way through the block). Impulse is force over a period of time; in this case, doesn't it equals the same thing?
What you have to think about is the force of the hit, the friction and inertia of the block and the material properties of wood and metal. This would let you calculate the impulse of the hit, which should let you work out if the block will slide out before expanding much vertically as the bullet trashes it.
If you're interested in this kind of stuff, this German guy has a great channel on Youtube: https://www.youtube.com/user/JoergSprave (his slingshot cannon is especially impressive)
It's kind of interesting how the dynamics of the game completely change with the pistol. Since you can get rid of entire rows now, you have rows of same orientation stacked upon each other all of a sudden.
http://woodgears.ca/tools.html
This guy is awesome.