Impossible pinball in a wooden cube


Uploaded by pocket83 on 09.09.2012

Transcript:
This is one of my favorites.
The pinball in a single piece wooden block.
As you can see, there is no way that a pinball is gonna fit into that hole.
So let me show you how you can do this.
This wooden cube right here is about two and a half inches (all the way around).
..but I think this one i'm gonna make two and a quarter.
and here is the size of a pinball (or at least the pinball that i'm going to be using).

For the holes, I'm going to be using a seven eighths inch spade bit.
You need to find solid piece of softwood. I'm gonna use poplar for mine, but I would bet that pine would work just as well.
If you can't find anything like that,
try checking on the bottom of pallets;
alot of times they use these for the bottom part.
Originally I wanted to use a nine ball instead of a pinball, but I couldn't find
a piece big enough for it.
Maybe in the future though...

Now, I want to get the insides nice and smooth with a drum sander.
It turned out alright...
This side got a little messed up, but that's because I should probably
have been using a forstner bit.
But it'll do just fine.
The prototype had a chamfer on it, but on this one I'm going to put a roumd-over.
I want this to look a little more round than it is, so i changed the quarter inch
round over bit to a three eighths roundover bit.
The bearing has been set in line with the fence.
That'll keep this piece from getting sucked in towards the router bit
At this point, you're probably just annoyed, and you want to know the secret.
But i'm not going to tell you until tomorrow.
Now I'm just gonna let it soak for about twenty-four hours.
See you later.
It's been twenty-four hours and I replaced the water that was in there
with hot water,
just in preparation for putting the bearing in,
and it's been fizzing like Alka-seltzer
for the last 10 minutes.
So I'm going to give it another half an hour
just to finish...
whatever it is that it's doing.
I'm going to use the vice to press the pinball into place,
so I'm coating the pinball
with mineral oil
to help it on its way, and into keep it from rusting over the next
couple days. I also made this PVC
sleeve that'll help push the pinball in.
To minimize the chance of splitting the piece while I'm pressing it in,
I'm going to be pressing it in through the end-grain.
Let me explain why.
Let's take a look at it up close.
Now let's take a look at it up really close.
Consider, by way of analogy, that
our block of wood isn't all that different in structure
from a bundle of drinking straws. In fact, when you look at wood under a microscope,
it looks very much like this.
Then, you can imagine that
our pinball passes through the end grain of the wood,
with a lot better...
alot easier than it would by being pressed directly through the center.
Likewise, driving a chisel
through the grain is going to be a lot easier this way,
or through the top of the end grain itself
than it would be to try to drive the chisel straight through.
This analogy also lets us understand why a cross-grain cut
is so much
harder to make than a rip-cut.
Now I'm gonna let it soak for just about ten minutes, just to help repair any damage
that might have been done when I pressed it in.
I don't want to dry it out too fast over the next couple of days, or else I run the risk of splitting it.
After about three or four days, when it's completely dry, I'll probably use mineral to
treat the wood.
And then, give it a nice sanding and finish it with shellac.
if you bring out the grain by (with) a nice finish, then its really apparent that
there are no seams in the wood,
and that really lends itself to a nice effect.
I really hope you enjoyed the video; thanks for watching!
I guess I should show you how to get the pinball back out...
Captioning by pocket83 :)