The idea was that each planet would have it's own drive disk.
Stack them all together, drive 8 hollow shafts and Bob's your uncle!
In the real world this was a bit more difficult then it seemed at first.
I had to make enourmous reduction gears to make the far planets move real slow.
And that in real time....
Interesting though.
I found that Tamiya made planetary gear boxes.
You can stack them and configure the ratio you want.
Nice.
Still needed lots of other gears.
Had to make these myself.
Even then, there is almost no (easy) way of making the exact orbit times.
click on the image to see the calculations
The bigest error is on Mercury.
0.14 degrees off per (Mercury) year.
I can live with that.
The solution:Make some counting wheels and use these to time the rotation exactly.
So you need a little computer to switch the motors on and off.
Can be done.
First I thought about a PLC, now PIC looks the better choice.
I can worry about that later.
Much later.
Some of the drawings:
The drive disk, need 8 of them...
Detail of the shafts with the gears....
Bits and pieces....
Assembled...
Well.. on the screen, that is
When Pluto was considered a "real" planet, I lost interest.
I made only 8 drives and I was not going to do it all again just because of Pluto.
I made only 8 drives and I was not going to do it all again just because of Pluto.
So, thanks to the International Astronomical Union, Pluto is what it is suposed to be:
A stone.
A large one, ok.
But still a stone.
Good, I can start again.
2 comments:
Aha - A machanical Planetarium. Great. I wouldn't bother about Pluto. Stone, planet ? By the time its finished the 'earth' will probably be a stone... so "just do it" and add a small comment below like in the Museums "Pluto is a stone - prove it!"...
Anon.
Neat. I've always wanted one of these.
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