Once you got the shape try Tig Slicer.
http://forums.sketchucation.com/viewtopic.php?t=42267#p374969

@unknownuser said:

vex wrote:
But I have a big question.

How can I get the rounded corners and edges like the succeeding images???. I share what I want get.

In SU, see http://forums.sketchucation.com/viewtopic.php?t=13563#p100509

Have a look at this one too.
http://forums.sketchucation.com/viewtopic.php?t=36822#p324196

Create the sphere, make it a component, plugin/screw, click first point, click second point, precision 12, number of turns 5, enter, wait few seconds..... done. less than 5 minutes.
http://rhin.crai.archi.fr/rld/download.php?file=screw1_5.rb

Another way.http://forums.sketchucation.com/viewtopic.php?f=15&t=15784&hilit=screw#p122571 with screw plugin.

Works fine thank you.

I have drawn 1000 instances of a cube,selected them, opened the ruby console, pasted your code and pressed enter: it returned Nil.
what am I doing wrong?

Sorry but I go backward 20Km/h to the toilets

@unknownuser said:

1,930km/h

Could you show the formula?

Forward

I'm sitting in a train, is speed is 250Km/h, I decide to go to the bar my speed relative to the train is 10Km/h ( I'm in a hurry I do need that beer!).
So what is my speed relative to the ground?

They are on.

The speeds are added.

Go on

Rich are you still here?

@unknownuser said:

by TIG on Sat Jan 28, 2012 7:54 pm

Ignoring the actually insurmountable issues of heat/pressure/radiation/forces etc...
And assuming that both ends of the hole are the same distance [to within a few meters] from the center of gravity of the earth...
If you did jump in you would fall, fall, fall... accelerating 'down' towards the center under the force of gravity [assuming 'air-resistance' you'd reach a terminal velocity - like a sky-diver], then you'd pass through the very center, and because of your momentum you would continue 'up' towards the other end of the hole... However, because you are now going against the force of gravity you'd decelerate, but you'd almost reach the other end before you slowed to a dead-stop and then started falling back towards the center again. Because your second 'start' is nearer the center then your momentum will be slightly less, as you again pass through the center and approach the other end... this time your trajectory is reversed a little nearer to the center... This cycle repeats with you falling back and forth, but getting progressively nearer the center with each reversal of trajectory. Eventually the reversals will become so frequent that you will effectively be oscillating around the center by an insignificant amount; theoretically after long enough had elapsed you might become stationary at the center, but in practice there are so many variable factors I suspect that you would never quite 'stop'...
Note: if you were agile enough... on the first 'fall', just as you approached the other end and slowed to a standstill you could 'grapple' onto the tunnel's wall just below the rim, so with a little climbing 'up' you could pop out at the other end... but I suspect you'd be a bit knackered by then [if not dead] !!!

Better said that I could, english isn't my native language

I can't prove it as I'm not physician, but if it is the center that attracts you if you pass beyond due to acceleration, you should be attract back?

Just stuck on center like a magnet.

Very disappointed to see that the Yes I vote for as only 11 votes at this time, I think it's the better Yes the other is just a little yes.

If gravity attracts you to the center of the earth, you should stop right there.